Parting out a SX 62

#30247

I have a SX 42 that I will be parting out.?
What are your needs?
I will pack and ship at? your expense.

Please contact me off list at ronbeaver1320@...

Thanks, Ron WB4OQL

? ? ? ? ? ? ?CLYDE, NC 28721

Re: HT45 Loudenboomer working now with new power supply

#30246

Rick and Gentlemen,

I hope to answer yes in a few days. I collected one just this Saturday.
Worked a 13 hour shift yesterday(Sunday). Have to snail mail the balance of what I am paying for it this AM.
Hope to get some time for a detailed inspection later today and will post findings.?

I am surprised at a 3kV plate supply bundled in with the rest of the wires in the power supply cable. 1964 :-) !!
Manual says it's OK for the 3-400Z to idle with 120mA Ip. 360W idle on a 400W tube. A shack warmer for sure.

73, -bob ah7i em73ts Atlanta GA

Re: Halicrafters SX17 transformer

#30245

开云体育

I love my HP 428B clamp on meter. They are affordable and great to use, even for small currents. I must have 6 or so of them. Never can have enough, HI. 73 – Mike

?

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

908-902-3831

?

Show quoted text

From: [email protected] <[email protected]> On Behalf Of don Root
Sent: Friday, May 31, 2024 7:26 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

Too bad we cant get clamp on miniature DC scope probe ?or dc ammeters? at pauper prices; then a guy with a running SX-17 could just peep inside the B= wiring.

?

?On 5/30/2024 6:44 PM, Jim Whartenby via groups.io wrote:
Rechecking the?Stancor, it does say 60 cycles but the bigger mistake is
in the B+ current rating.? I should have said the Stancor P-6013.? The
difference is 90 vs 120 mA.? This may be a problem when the cost is
driving the spec.? Less copper, less iron, lower price.

Re: Halicrafters SX17 transformer

#30244

开云体育

Too bad we cant get clamp on miniature DC scope probe ?or dc ammeters? at pauper prices; then a guy with a running SX-17 could just peep inside the B= wiring.

?On 5/30/2024 6:44 PM, Jim Whartenby via groups.io wrote:
Rechecking the?Stancor, it does say 60 cycles but the bigger mistake is
in the B+ current rating.? I should have said the Stancor P-6013.? The
difference is 90 vs 120 mA.? This may be a problem when the cost is
driving the spec.? Less copper, less iron, lower price.

_._,_._,_

._,_

--
don??? va3drl

Re: Halicrafters SX17 transformer

#30243

I've seen other transformers with this frequency range. Covers 400
and 800 Hz used in aircraft.
By memory ( and could be wrong) PAECO stands for Palo Alto
Engineering Company and was bought by Hewlett-Packard who continued to
use the name.

Show quoted text

On 5/30/2024 6:44 PM, Jim Whartenby via groups.io wrote:

Well, he says sheepishly, this is true for the Thordarson, 50-60
cycles.? The PAECO frequency range is from 50 to 1000 cycles. I still
think the PAECO is the all around winner, if this is a contest.

Rechecking the?Stancor, it does say 60 cycles but the bigger mistake is
in the B+ current rating.? I should have said the Stancor P-6013.? The
difference is 90 vs 120 mA.? This may be a problem when the cost is
driving the spec.? Less copper, less iron, lower price.

Regards,
Jim

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

Re: Halicrafters SX17 transformer

#30242

Thank you for that suggestion. I can probably remove the rectifier valve and disconnect the heater circuit for the same effect. Then again, I will probably have to remove the valves anyway...

Re: Halicrafters SX17 transformer

#30241

开云体育

John ,? my tendency is to take it up on a variac and watch the primary milli-Amps, often with the rectifier or maybe all tubes removed. Just a small magnetizing current should show up if it is good—no shorted turns.

?

Show quoted text

From: [email protected] [mailto:[email protected]] On Behalf Of John via groups.io
Sent: Friday, May 31, 2024 6:48 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

I finally managed to pry open the lid at the top of the receiver. It was seized with age and at first I didn’t want to use too much force so as not to cause any damage. However, opening it up was necessary if the radio was to be repaired and with careful levering and a bit of effort, thankfully it did finally pop open with no damage done. I don’t know whether one can post photos on here, but now that I can see the top side of the transformer, it is much bigger than imagined. It also has a sort of tag strip on top marked with different voltages, from 250V to 110V, so it can be configured for use on UK mains. The fly lead with the ‘bullet’ connector was slid into the 250V tag which would be correct. I pushed the connector out and back in a couple of times and then read about 15 ohms across the mains cable. It seems that my initial suspicion of an open transformer may have been premature and erroneous.

I don’t know for sure whether the open reading was down to that connector, or perhaps the power switch needing to be worked a few times, or just the state of the mains wiring, which is pretty awful and does need work to make it safe. The transformer wires ought to be terminated onto a tag strip and some of the wiring needs to be replaced before anything else can be done. There are also a couple of wires floating loose including one from the transformer which has been coiled at the end. I am curious as to what the purpose of doing that might be and can’t see any obvious point where it might have connected to? There is another loose wire next to a pot which needs identifying and re-connecting. The state of some of the capacitors looks pretty awful as well so I don’t think even waking it up gradually on a variac would necessarily be a good idea before some of those are replaced? In any case, all of the paper caps are replace on sight items.?The transformer itself is loose so I expect that the rubber bushes on which sits have likely perished and need replacing. As I mentioned earlier, quite a bit of work and some further investigation to be done, but hopefully the transformer is actually OK.

_._,_._,_

,_

--
don??? va3drl

Re: Halicrafters SX17 transformer

#30240

I finally managed to pry open the lid at the top of the receiver. It was seized with age and at first I didn’t want to use too much force so as not to cause any damage. However, opening it up was necessary if the radio was to be repaired and with careful levering and a bit of effort, thankfully it did finally pop open with no damage done. I don’t know whether one can post photos on here, but now that I can see the top side of the transformer, it is much bigger than imagined. It also has a sort of tag strip on top marked with different voltages, from 250V to 110V, so it can be configured for use on UK mains. The fly lead with the ‘bullet’ connector was slid into the 250V tag which would be correct. I pushed the connector out and back in a couple of times and then read about 15 ohms across the mains cable. It seems that my initial suspicion of an open transformer may have been premature and erroneous.

I don’t know for sure whether the open reading was down to that connector, or perhaps the power switch needing to be worked a few times, or just the state of the mains wiring, which is pretty awful and does need work to make it safe. The transformer wires ought to be terminated onto a tag strip and some of the wiring needs to be replaced before anything else can be done. There are also a couple of wires floating loose including one from the transformer which has been coiled at the end. I am curious as to what the purpose of doing that might be and can’t see any obvious point where it might have connected to? There is another loose wire next to a pot which needs identifying and re-connecting. The state of some of the capacitors looks pretty awful as well so I don’t think even waking it up gradually on a variac would necessarily be a good idea before some of those are replaced? In any case, all of the paper caps are replace on sight items.?The transformer itself is loose so I expect that the rubber bushes on which sits have likely perished and need replacing. As I mentioned earlier, quite a bit of work and some further investigation to be done, but hopefully the transformer is actually OK.

Re: Halicrafters SX17 transformer

#30239

Well, he says sheepishly, this is true for the Thordarson, 50-60 cycles.? The PAECO frequency range is from 50 to 1000 cycles.??I still think the PAECO is the all around winner, if this is a contest.

Rechecking the?Stancor, it does say 60 cycles but the bigger mistake is in the B+ current rating.? I should have said the Stancor P-6013.? The difference is 90 vs 120 mA.? This may be a problem when the cost is driving the spec.? Less copper, less iron, lower price.

Regards,

Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

On Thursday, May 30, 2024 at 07:36:07 PM CDT, Jim Whartenby <old_radio@...> wrote:

Yes. according to the catalog, 50-60 cycle

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

On Thursday, May 30, 2024 at 12:08:20 PM CDT, don Root <drootofallevil@...> wrote:

Jim, are these 50 cycle ?

?

Show quoted text

From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Thursday, May 30, 2024 11:18 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

John

There are various catalogs from replacement transformer manufacturers, I looked at STANCOR and THORDARSON, for example.? There are others.? I have not looked at my junque box so there are still other possibilities.

?

STANCOR? model PC8420 / PM8420 (same transformer, different mounting) has the following specs:

2 1/2 inch by 2 9/16 mounting hole spacing

325 - 0 - 325 volts @ 150mA

5 volts @ 3 amps

6.3 volts @ 5 amps

?

THORDARSON? model 22R05

2 1/2 inch by 3 1/8 inch mounting hole spacing

300 - 0 - 300 volts @ 120 mA

5 volts @ 3 amps

6,3 volts @ 5 amps

?

Another transformer of interest is the one found in the Hewlett-Packard 200CD audio oscillator.? This might be available either locally to you or on eBay?? It has 115 - 230 volt split primary windings which is a plus.

PAECO model 910-94

2,5 inch by 2.34 inch mounting hole spacing

315 - 0 - 315 volts @ 125 mA

5 volts @ 2 amps

6.3 volts @ 3.55 amps.? It should do 4 amps with no trouble.

This is an over designed power transformer with very conservative ratings so it should fit the bill but it's mounting is upright not horizontal like that in the SX-17.? It also contains a 8H @ 125 mA filter choke.? The manual is available on-line, with photos.? I have a history with this transformer.

?

Regards,

Jim

?

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

?

On Thursday, May 30, 2024 at 05:28:29 AM CDT, John via groups.io <siloam@...> wrote:

?

I completely forgot about noting the current on the low voltage windings! I added up the heater currents and arrived at the same 3.9A that you did. In addition to this, according to the data-sheet, the heater for the rectifier on the 5V winding takes 3A.

For the exercise, I also tried calculating the valve currents according to the cathode voltage and the cathode resistor. I did struggle to understand how to apply that for the 6R7 and the 6J5, but was able to do calculations for some of the other valves. The meter amplifier valve also puzzled me since the 95ohm resistor and 10V cathode voltage would suggest 100mA or thereabouts, but the data-sheet states that the maximum running current for the 6J7G is 2mA, so that didn’t make sense. For those that I was unsure of, I just used the value from data-sheet and arrived at somewhere around 150mA which is in a similar ball-park, although in all probability there are errors in my calculations. The values for first two 6K7’s were also curious as they come to approximately 12mA (8/700) which is more than the 10mA shown on the data-sheet. There is, of course, R1, the RF gain control in series, but one would presumably have to assume the highest case at minimum setting? It would seem that the valves can be pushed pretty hard at that setting.

I struggled a bit with the transformer screw positions but they seem to be placed 100mm (4 inches) apart on the long side and 77mm (3 inches) apart on the short side. Removing the transformer would allow me to make more precise measurements, but that will have to wait for another day or two until I am feeling well enough. I came down with some kind of bug a coulple of days ago.

Anyway, thank you for your help and for taking the time and trouble to confirm the calculations.

As a matter of curiosity, what catalog are you looking at please?

Re: Halicrafters SX17 transformer

#30238

开云体育

Lee – You have that completely backward. – 73 – Mike

?

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

908-902-3831

?

Show quoted text

From: [email protected] <[email protected]> On Behalf Of Lee Bahr
Sent: Thursday, May 30, 2024 5:28 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

You can run 60 cycle transformers on 50 cycles but you can't run 50 cycle transformers on 60 cycles.? A 60 cycle transformer has more iron in it then one for 50 cycles.

Lee, w0vt

On 5/30/2024 3:24 PM, Richard Knoppow wrote:

It seems to me that most 60Hz power transformers will perform OK on
50Hz although they may run hot.

On 5/30/2024 12:34 PM, John via groups.io wrote:
Since the radio is in the UK, it would need to operate on 50Hz mains.
Looking at the data, the Stancor appears to be for operation on 60Hz,
whereas the Thordarson catalog states that the 22R05 operates on both 50
and 60Hz.

I am also going to post on a vintage radio forum which is predominantly
UK based so see whether there is a UK based outlet or whether anyone
here in the UK might have a suitable salvaged spare, and now that I know
what I m looking for, also check eBay. I am happy to ship from the USA
if need be and options are limited, but obviously shipping to the UK is
not cheap so I do appreciate Jim’s kind offer.
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

Re: Halicrafters SX17 transformer

#30237

Yes. according to the catalog, 50-60 cycle

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

On Thursday, May 30, 2024 at 12:08:20 PM CDT, don Root <drootofallevil@...> wrote:

Jim, are these 50 cycle ?

?

Show quoted text

From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Thursday, May 30, 2024 11:18 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

John

There are various catalogs from replacement transformer manufacturers, I looked at STANCOR and THORDARSON, for example.? There are others.? I have not looked at my junque box so there are still other possibilities.

?

STANCOR? model PC8420 / PM8420 (same transformer, different mounting) has the following specs:

2 1/2 inch by 2 9/16 mounting hole spacing

325 - 0 - 325 volts @ 150mA

5 volts @ 3 amps

6.3 volts @ 5 amps

?

THORDARSON? model 22R05

2 1/2 inch by 3 1/8 inch mounting hole spacing

300 - 0 - 300 volts @ 120 mA

5 volts @ 3 amps

6,3 volts @ 5 amps

?

Another transformer of interest is the one found in the Hewlett-Packard 200CD audio oscillator.? This might be available either locally to you or on eBay?? It has 115 - 230 volt split primary windings which is a plus.

PAECO model 910-94

2,5 inch by 2.34 inch mounting hole spacing

315 - 0 - 315 volts @ 125 mA

5 volts @ 2 amps

6.3 volts @ 3.55 amps.? It should do 4 amps with no trouble.

This is an over designed power transformer with very conservative ratings so it should fit the bill but it's mounting is upright not horizontal like that in the SX-17.? It also contains a 8H @ 125 mA filter choke.? The manual is available on-line, with photos.? I have a history with this transformer.

?

Regards,

Jim

?

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

?

On Thursday, May 30, 2024 at 05:28:29 AM CDT, John via groups.io <siloam@...> wrote:

?

I completely forgot about noting the current on the low voltage windings! I added up the heater currents and arrived at the same 3.9A that you did. In addition to this, according to the data-sheet, the heater for the rectifier on the 5V winding takes 3A.

For the exercise, I also tried calculating the valve currents according to the cathode voltage and the cathode resistor. I did struggle to understand how to apply that for the 6R7 and the 6J5, but was able to do calculations for some of the other valves. The meter amplifier valve also puzzled me since the 95ohm resistor and 10V cathode voltage would suggest 100mA or thereabouts, but the data-sheet states that the maximum running current for the 6J7G is 2mA, so that didn’t make sense. For those that I was unsure of, I just used the value from data-sheet and arrived at somewhere around 150mA which is in a similar ball-park, although in all probability there are errors in my calculations. The values for first two 6K7’s were also curious as they come to approximately 12mA (8/700) which is more than the 10mA shown on the data-sheet. There is, of course, R1, the RF gain control in series, but one would presumably have to assume the highest case at minimum setting? It would seem that the valves can be pushed pretty hard at that setting.

I struggled a bit with the transformer screw positions but they seem to be placed 100mm (4 inches) apart on the long side and 77mm (3 inches) apart on the short side. Removing the transformer would allow me to make more precise measurements, but that will have to wait for another day or two until I am feeling well enough. I came down with some kind of bug a coulple of days ago.

Anyway, thank you for your help and for taking the time and trouble to confirm the calculations.

As a matter of curiosity, what catalog are you looking at please?

Re: Halicrafters SX17 transformer

#30236

Other way around, the low frequency transformer must have more
iron. There may be additional losses in a tranformer at higher
frequencies but generally 50Hz will run fine at 60Hz. Where transformers
must run at very high frequencies, like 400Hz, they must be specially
designed for it. Same at 25Hz, those will run fine at 60Hz but might get
hot. They are usually very heavy compared to a 50 or 60Hz transformers.
One of the power supplies for the BC-779 Super-Pro runs at 25 to 60 Hz
and must weigh about three times what a 60Hz supply does. Of course it
also needs larger chokes and capacitors.
Of course, high frequency supplies, generally used in aircraft, also
need different chokes and filter caps.

Show quoted text

On 5/30/2024 2:28 PM, Lee Bahr wrote:

You can run 60 cycle transformers on 50 cycles but you can't run 50
cycle transformers on 60 cycles.? A 60 cycle transformer has more iron
in it then one for 50 cycles.

Lee, w0vt

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

Re: Halicrafters SX17 transformer

#30235

开云体育

Jacques, you must have your good binoculars in-use. I was reading? the tests box. Yes it says 50/60 ?under the core diagram and it says 50/60 ,127va on top of the 3D drawing of the transformer too.

?

Show quoted text

From: [email protected] [mailto:[email protected]] On Behalf Of Jacques_VE2JFE
Sent: Thursday, May 30, 2024 3:39 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] Halicrafters SX17 transformer
Importance: High

?

Don, please read the .pdf more attentively.

Just at the right of the GRY – ELECTROSTATIC SHIELD, what do you see ??

?

73, Jacques, VE2JFE in Montreal

?

De?: [email protected] <[email protected]> De la part de don Root
贰苍惫辞测é?: 30 mai 2024 14:39
??: [email protected]
Objet?: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

Jacques, as I read it this is a 60 Hz , nota ?50 Hz ?unit

Don

?

From: [email protected] [mailto:[email protected]] On Behalf Of Jacques_VE2JFE
Sent: Thursday, May 30, 2024 1:59 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

Another possible replacement is a Hammond 372DX.

See attached.

?

73, Jacques, VE2JFE in Montreal

?

De?: [email protected] <[email protected]> De la part de don Root
贰苍惫辞测é?: 30 mai 2024 13:08
??: [email protected]
Objet?: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

Jim, are these 50 cycle ?

?

From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Thursday, May 30, 2024 11:18 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

John

There are various catalogs from replacement transformer manufacturers, I looked at STANCOR and THORDARSON, for example.? There are others.? I have not looked at my junque box so there are still other possibilities.

?

STANCOR? model PC8420 / PM8420 (same transformer, different mounting) has the following specs:

2 1/2 inch by 2 9/16 mounting hole spacing

325 - 0 - 325 volts @ 150mA

5 volts @ 3 amps

6.3 volts @ 5 amps

?

THORDARSON? model 22R05

2 1/2 inch by 3 1/8 inch mounting hole spacing

300 - 0 - 300 volts @ 120 mA

5 volts @ 3 amps

6,3 volts @ 5 amps

?

Another transformer of interest is the one found in the Hewlett-Packard 200CD audio oscillator.? This might be available either locally to you or on eBay?? It has 115 - 230 volt split primary windings which is a plus.

PAECO model 910-94

2,5 inch by 2.34 inch mounting hole spacing

315 - 0 - 315 volts @ 125 mA

5 volts @ 2 amps

6.3 volts @ 3.55 amps.? It should do 4 amps with no trouble.

This is an over designed power transformer with very conservative ratings so it should fit the bill but it's mounting is upright not horizontal like that in the SX-17.? It also contains a 8H @ 125 mA filter choke.? The manual is available on-line, with photos.? I have a history with this transformer.

?

Regards,

Jim

?

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

?

On Thursday, May 30, 2024 at 05:28:29 AM CDT, John via groups.io <siloam@...> wrote:

?

I completely forgot about noting the current on the low voltage windings! I added up the heater currents and arrived at the same 3.9A that you did. In addition to this, according to the data-sheet, the heater for the rectifier on the 5V winding takes 3A.

For the exercise, I also tried calculating the valve currents according to the cathode voltage and the cathode resistor. I did struggle to understand how to apply that for the 6R7 and the 6J5, but was able to do calculations for some of the other valves. The meter amplifier valve also puzzled me since the 95ohm resistor and 10V cathode voltage would suggest 100mA or thereabouts, but the data-sheet states that the maximum running current for the 6J7G is 2mA, so that didn’t make sense. For those that I was unsure of, I just used the value from data-sheet and arrived at somewhere around 150mA which is in a similar ball-park, although in all probability there are errors in my calculations. The values for first two 6K7’s were also curious as they come to approximately 12mA (8/700) which is more than the 10mA shown on the data-sheet. There is, of course, R1, the RF gain control in series, but one would presumably have to assume the highest case at minimum setting? It would seem that the valves can be pushed pretty hard at that setting.

I struggled a bit with the transformer screw positions but they seem to be placed 100mm (4 inches) apart on the long side and 77mm (3 inches) apart on the short side. Removing the transformer would allow me to make more precise measurements, but that will have to wait for another day or two until I am feeling well enough. I came down with some kind of bug a coulple of days ago.

Anyway, thank you for your help and for taking the time and trouble to confirm the calculations.

As a matter of curiosity, what catalog are you looking at please?

?

--
don??? va3drl

_._,_._,_

--
don??? va3drl

Re: Halicrafters SX17 transformer

#30234

开云体育

You can run 60 cycle transformers on 50 cycles but you can't run 50 cycle transformers on 60 cycles.? A 60 cycle transformer has more iron in it then one for 50 cycles.

Lee, w0vt

On 5/30/2024 3:24 PM, Richard Knoppow wrote:

Show quoted text

It seems to me that most 60Hz power transformers will perform OK on
50Hz although they may run hot.

On 5/30/2024 12:34 PM, John via groups.io wrote:

Since the radio is in the UK, it would need to operate on 50Hz mains.
Looking at the data, the Stancor appears to be for operation on 60Hz,
whereas the Thordarson catalog states that the 22R05 operates on both 50
and 60Hz.

I am also going to post on a vintage radio forum which is predominantly
UK based so see whether there is a UK based outlet or whether anyone
here in the UK might have a suitable salvaged spare, and now that I know
what I m looking for, also check eBay. I am happy to ship from the USA
if need be and options are limited, but obviously shipping to the UK is
not cheap so I do appreciate Jim’s kind offer.

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

Re: Halicrafters SX17 transformer

#30233

It seems to me that most 60Hz power transformers will perform OK on
50Hz although they may run hot.

Show quoted text

On 5/30/2024 12:34 PM, John via groups.io wrote:

Since the radio is in the UK, it would need to operate on 50Hz mains.
Looking at the data, the Stancor appears to be for operation on 60Hz,
whereas the Thordarson catalog states that the 22R05 operates on both 50
and 60Hz.

I am also going to post on a vintage radio forum which is predominantly
UK based so see whether there is a UK based outlet or whether anyone
here in the UK might have a suitable salvaged spare, and now that I know
what I m looking for, also check eBay. I am happy to ship from the USA
if need be and options are limited, but obviously shipping to the UK is
not cheap so I do appreciate Jim’s kind offer.

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

Re: Halicrafters SX17 transformer

#30232

开云体育

Don, please read the .pdf more attentively.

Just at the right of the GRY – ELECTROSTATIC SHIELD, what do you see ??

?

73, Jacques, VE2JFE in Montreal

?

De?: [email protected] <[email protected]> De la part de don Root
贰苍惫辞测é?: 30 mai 2024 14:39
??: [email protected]
Objet?: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

Jacques, as I read it this is a 60 Hz , nota ?50 Hz ?unit

Don

?

Show quoted text

From: [email protected] [mailto:[email protected]] On Behalf Of Jacques_VE2JFE
Sent: Thursday, May 30, 2024 1:59 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

Another possible replacement is a Hammond 372DX.

See attached.

?

73, Jacques, VE2JFE in Montreal

?

De?: [email protected] <[email protected]> De la part de don Root
贰苍惫辞测é?: 30 mai 2024 13:08
??: [email protected]
Objet?: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

Jim, are these 50 cycle ?

?

From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Thursday, May 30, 2024 11:18 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

John

There are various catalogs from replacement transformer manufacturers, I looked at STANCOR and THORDARSON, for example.? There are others.? I have not looked at my junque box so there are still other possibilities.

?

STANCOR? model PC8420 / PM8420 (same transformer, different mounting) has the following specs:

2 1/2 inch by 2 9/16 mounting hole spacing

325 - 0 - 325 volts @ 150mA

5 volts @ 3 amps

6.3 volts @ 5 amps

?

THORDARSON? model 22R05

2 1/2 inch by 3 1/8 inch mounting hole spacing

300 - 0 - 300 volts @ 120 mA

5 volts @ 3 amps

6,3 volts @ 5 amps

?

Another transformer of interest is the one found in the Hewlett-Packard 200CD audio oscillator.? This might be available either locally to you or on eBay?? It has 115 - 230 volt split primary windings which is a plus.

PAECO model 910-94

2,5 inch by 2.34 inch mounting hole spacing

315 - 0 - 315 volts @ 125 mA

5 volts @ 2 amps

6.3 volts @ 3.55 amps.? It should do 4 amps with no trouble.

This is an over designed power transformer with very conservative ratings so it should fit the bill but it's mounting is upright not horizontal like that in the SX-17.? It also contains a 8H @ 125 mA filter choke.? The manual is available on-line, with photos.? I have a history with this transformer.

?

Regards,

Jim

?

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

?

On Thursday, May 30, 2024 at 05:28:29 AM CDT, John via groups.io <siloam@...> wrote:

?

I completely forgot about noting the current on the low voltage windings! I added up the heater currents and arrived at the same 3.9A that you did. In addition to this, according to the data-sheet, the heater for the rectifier on the 5V winding takes 3A.

For the exercise, I also tried calculating the valve currents according to the cathode voltage and the cathode resistor. I did struggle to understand how to apply that for the 6R7 and the 6J5, but was able to do calculations for some of the other valves. The meter amplifier valve also puzzled me since the 95ohm resistor and 10V cathode voltage would suggest 100mA or thereabouts, but the data-sheet states that the maximum running current for the 6J7G is 2mA, so that didn’t make sense. For those that I was unsure of, I just used the value from data-sheet and arrived at somewhere around 150mA which is in a similar ball-park, although in all probability there are errors in my calculations. The values for first two 6K7’s were also curious as they come to approximately 12mA (8/700) which is more than the 10mA shown on the data-sheet. There is, of course, R1, the RF gain control in series, but one would presumably have to assume the highest case at minimum setting? It would seem that the valves can be pushed pretty hard at that setting.

I struggled a bit with the transformer screw positions but they seem to be placed 100mm (4 inches) apart on the long side and 77mm (3 inches) apart on the short side. Removing the transformer would allow me to make more precise measurements, but that will have to wait for another day or two until I am feeling well enough. I came down with some kind of bug a coulple of days ago.

Anyway, thank you for your help and for taking the time and trouble to confirm the calculations.

As a matter of curiosity, what catalog are you looking at please?

?

--
don??? va3drl

Re: Halicrafters SX17 transformer

#30231

Since the radio is in the UK, it would need to operate on 50Hz mains. Looking at the data, the Stancor appears to be for operation on 60Hz, whereas the Thordarson catalog states that the 22R05 operates on both 50 and 60Hz.

I am also going to post on a vintage radio forum which is predominantly UK based so see whether there is a UK based outlet or whether anyone here in the UK might have a suitable salvaged spare, and now that I know what I m looking for, also check eBay. I am happy to ship from the USA if need be and options are limited, but obviously shipping to the UK is not cheap so I do appreciate Jim’s kind offer.

Re: Halicrafters SX17 transformer

#30230

开云体育

Jacques, as I read it this is a 60 Hz , nota ?50 Hz ?unit

Don

?

Show quoted text

From: [email protected] [mailto:[email protected]] On Behalf Of Jacques_VE2JFE
Sent: Thursday, May 30, 2024 1:59 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

Another possible replacement is a Hammond 372DX.

See attached.

?

73, Jacques, VE2JFE in Montreal

?

De?: [email protected] <[email protected]> De la part de don Root
贰苍惫辞测é?: 30 mai 2024 13:08
??: [email protected]
Objet?: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

Jim, are these 50 cycle ?

?

From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Thursday, May 30, 2024 11:18 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

John

There are various catalogs from replacement transformer manufacturers, I looked at STANCOR and THORDARSON, for example.? There are others.? I have not looked at my junque box so there are still other possibilities.

?

STANCOR? model PC8420 / PM8420 (same transformer, different mounting) has the following specs:

2 1/2 inch by 2 9/16 mounting hole spacing

325 - 0 - 325 volts @ 150mA

5 volts @ 3 amps

6.3 volts @ 5 amps

?

THORDARSON? model 22R05

2 1/2 inch by 3 1/8 inch mounting hole spacing

300 - 0 - 300 volts @ 120 mA

5 volts @ 3 amps

6,3 volts @ 5 amps

?

Another transformer of interest is the one found in the Hewlett-Packard 200CD audio oscillator.? This might be available either locally to you or on eBay?? It has 115 - 230 volt split primary windings which is a plus.

PAECO model 910-94

2,5 inch by 2.34 inch mounting hole spacing

315 - 0 - 315 volts @ 125 mA

5 volts @ 2 amps

6.3 volts @ 3.55 amps.? It should do 4 amps with no trouble.

This is an over designed power transformer with very conservative ratings so it should fit the bill but it's mounting is upright not horizontal like that in the SX-17.? It also contains a 8H @ 125 mA filter choke.? The manual is available on-line, with photos.? I have a history with this transformer.

?

Regards,

Jim

?

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

?

On Thursday, May 30, 2024 at 05:28:29 AM CDT, John via groups.io <siloam@...> wrote:

?

I completely forgot about noting the current on the low voltage windings! I added up the heater currents and arrived at the same 3.9A that you did. In addition to this, according to the data-sheet, the heater for the rectifier on the 5V winding takes 3A.

For the exercise, I also tried calculating the valve currents according to the cathode voltage and the cathode resistor. I did struggle to understand how to apply that for the 6R7 and the 6J5, but was able to do calculations for some of the other valves. The meter amplifier valve also puzzled me since the 95ohm resistor and 10V cathode voltage would suggest 100mA or thereabouts, but the data-sheet states that the maximum running current for the 6J7G is 2mA, so that didn’t make sense. For those that I was unsure of, I just used the value from data-sheet and arrived at somewhere around 150mA which is in a similar ball-park, although in all probability there are errors in my calculations. The values for first two 6K7’s were also curious as they come to approximately 12mA (8/700) which is more than the 10mA shown on the data-sheet. There is, of course, R1, the RF gain control in series, but one would presumably have to assume the highest case at minimum setting? It would seem that the valves can be pushed pretty hard at that setting.

I struggled a bit with the transformer screw positions but they seem to be placed 100mm (4 inches) apart on the long side and 77mm (3 inches) apart on the short side. Removing the transformer would allow me to make more precise measurements, but that will have to wait for another day or two until I am feeling well enough. I came down with some kind of bug a coulple of days ago.

Anyway, thank you for your help and for taking the time and trouble to confirm the calculations.

As a matter of curiosity, what catalog are you looking at please?

--
don??? va3drl

Re: Halicrafters SX17 transformer

#30229

开云体育

Another possible replacement is a Hammond 372DX.

See attached.

?

73, Jacques, VE2JFE in Montreal

?

De?: [email protected] <[email protected]> De la part de don Root
贰苍惫辞测é?: 30 mai 2024 13:08
??: [email protected]
Objet?: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

Jim, are these 50 cycle ?

?

Show quoted text

From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Thursday, May 30, 2024 11:18 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

John

There are various catalogs from replacement transformer manufacturers, I looked at STANCOR and THORDARSON, for example.? There are others.? I have not looked at my junque box so there are still other possibilities.

?

STANCOR? model PC8420 / PM8420 (same transformer, different mounting) has the following specs:

2 1/2 inch by 2 9/16 mounting hole spacing

325 - 0 - 325 volts @ 150mA

5 volts @ 3 amps

6.3 volts @ 5 amps

?

THORDARSON? model 22R05

2 1/2 inch by 3 1/8 inch mounting hole spacing

300 - 0 - 300 volts @ 120 mA

5 volts @ 3 amps

6,3 volts @ 5 amps

?

Another transformer of interest is the one found in the Hewlett-Packard 200CD audio oscillator.? This might be available either locally to you or on eBay?? It has 115 - 230 volt split primary windings which is a plus.

PAECO model 910-94

2,5 inch by 2.34 inch mounting hole spacing

315 - 0 - 315 volts @ 125 mA

5 volts @ 2 amps

6.3 volts @ 3.55 amps.? It should do 4 amps with no trouble.

This is an over designed power transformer with very conservative ratings so it should fit the bill but it's mounting is upright not horizontal like that in the SX-17.? It also contains a 8H @ 125 mA filter choke.? The manual is available on-line, with photos.? I have a history with this transformer.

?

Regards,

Jim

?

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

?

On Thursday, May 30, 2024 at 05:28:29 AM CDT, John via groups.io <siloam@...> wrote:

?

I completely forgot about noting the current on the low voltage windings! I added up the heater currents and arrived at the same 3.9A that you did. In addition to this, according to the data-sheet, the heater for the rectifier on the 5V winding takes 3A.

For the exercise, I also tried calculating the valve currents according to the cathode voltage and the cathode resistor. I did struggle to understand how to apply that for the 6R7 and the 6J5, but was able to do calculations for some of the other valves. The meter amplifier valve also puzzled me since the 95ohm resistor and 10V cathode voltage would suggest 100mA or thereabouts, but the data-sheet states that the maximum running current for the 6J7G is 2mA, so that didn’t make sense. For those that I was unsure of, I just used the value from data-sheet and arrived at somewhere around 150mA which is in a similar ball-park, although in all probability there are errors in my calculations. The values for first two 6K7’s were also curious as they come to approximately 12mA (8/700) which is more than the 10mA shown on the data-sheet. There is, of course, R1, the RF gain control in series, but one would presumably have to assume the highest case at minimum setting? It would seem that the valves can be pushed pretty hard at that setting.

I struggled a bit with the transformer screw positions but they seem to be placed 100mm (4 inches) apart on the long side and 77mm (3 inches) apart on the short side. Removing the transformer would allow me to make more precise measurements, but that will have to wait for another day or two until I am feeling well enough. I came down with some kind of bug a coulple of days ago.

Anyway, thank you for your help and for taking the time and trouble to confirm the calculations.

As a matter of curiosity, what catalog are you looking at please?

372DX.pdf

Re: Halicrafters SX17 transformer

#30228

开云体育

Jim, are these 50 cycle ?

?

Show quoted text

From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Thursday, May 30, 2024 11:18 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] Halicrafters SX17 transformer

?

John

There are various catalogs from replacement transformer manufacturers, I looked at STANCOR and THORDARSON, for example.? There are others.? I have not looked at my junque box so there are still other possibilities.

?

STANCOR? model PC8420 / PM8420 (same transformer, different mounting) has the following specs:

2 1/2 inch by 2 9/16 mounting hole spacing

325 - 0 - 325 volts @ 150mA

5 volts @ 3 amps

6.3 volts @ 5 amps

?

THORDARSON? model 22R05

2 1/2 inch by 3 1/8 inch mounting hole spacing

300 - 0 - 300 volts @ 120 mA

5 volts @ 3 amps

6,3 volts @ 5 amps

?

Another transformer of interest is the one found in the Hewlett-Packard 200CD audio oscillator.? This might be available either locally to you or on eBay?? It has 115 - 230 volt split primary windings which is a plus.

PAECO model 910-94

2,5 inch by 2.34 inch mounting hole spacing

315 - 0 - 315 volts @ 125 mA

5 volts @ 2 amps

6.3 volts @ 3.55 amps.? It should do 4 amps with no trouble.

This is an over designed power transformer with very conservative ratings so it should fit the bill but it's mounting is upright not horizontal like that in the SX-17.? It also contains a 8H @ 125 mA filter choke.? The manual is available on-line, with photos.? I have a history with this transformer.

?

Regards,

Jim

?

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

?

On Thursday, May 30, 2024 at 05:28:29 AM CDT, John via groups.io <siloam@...> wrote:

?

I completely forgot about noting the current on the low voltage windings! I added up the heater currents and arrived at the same 3.9A that you did. In addition to this, according to the data-sheet, the heater for the rectifier on the 5V winding takes 3A.

For the exercise, I also tried calculating the valve currents according to the cathode voltage and the cathode resistor. I did struggle to understand how to apply that for the 6R7 and the 6J5, but was able to do calculations for some of the other valves. The meter amplifier valve also puzzled me since the 95ohm resistor and 10V cathode voltage would suggest 100mA or thereabouts, but the data-sheet states that the maximum running current for the 6J7G is 2mA, so that didn’t make sense. For those that I was unsure of, I just used the value from data-sheet and arrived at somewhere around 150mA which is in a similar ball-park, although in all probability there are errors in my calculations. The values for first two 6K7’s were also curious as they come to approximately 12mA (8/700) which is more than the 10mA shown on the data-sheet. There is, of course, R1, the RF gain control in series, but one would presumably have to assume the highest case at minimum setting? It would seem that the valves can be pushed pretty hard at that setting.

I struggled a bit with the transformer screw positions but they seem to be placed 100mm (4 inches) apart on the long side and 77mm (3 inches) apart on the short side. Removing the transformer would allow me to make more precise measurements, but that will have to wait for another day or two until I am feeling well enough. I came down with some kind of bug a coulple of days ago.

Anyway, thank you for your help and for taking the time and trouble to confirm the calculations.

As a matter of curiosity, what catalog are you looking at please?

_._,_._,_

--
don??? va3drl