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Re: SR-150 PWR Supply

 

Jack
I seem to have missed the comment by Walter Cates on 60 cycle hum on TX.? Can you tell me the message date or message number so that I can refresh my memory?

If the GFCI is tripping then there is an imbalance of current between the common and hot leads of the line cord.? The GFCI is doing it's job in detecting this imbalance.? There is a leakage path there, possibly through the station ground?
Regards,
Jim

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


On Wednesday, January 1, 2025 at 10:30:56 AM CST, Jack Brabham - KZ5A via groups.io <kz5a.jack@...> wrote:


I just finished a complete rebuild on my? PS 150-120.? I choose to stay with a 2 prong polarized power cord mostly due to Walter Cates recommendation to avoid 60hz hum on the TX.? ?Didn't see why at first but I think I've codgertated it out.? ?The TRX? and PS were designed together and? the TX is intended to be the common signal ground point for both.? With? a 2? prong polarized plug and cord this works fine but will not support a GFI.? ?
?
If you add? a? 3 prong? cord to? the PS the 60hz current passed? by C201 and C202 appears on the electrical Ground and can be passed to the electrical Common via the main AC breaker box? where the 2 are terminated to the same buss.? ?This can appear as a 60hz potential between a station RF ground and the electrical Common which apparently can find it's way into the TX audio.
?
This is no doubt highly situational depending? on house and station wiring.? ?If you use a 3 prong AC cord and encounter the hum, deleting C201 and C202 might fix it.? Also the 60hz current passed onto the electrical Ground by the capacitors? could? trip a GFI considering that is the current they are intended to sense.??
?
A ferrite on the power cord can functionally? replace? the caps.
?
73 Jack KZ5A
?
?
?
Re: 2-wire, unpolarized outlet ?

 

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Skip, The codes said for a long time neutral is the white wire? and hot is the black wire. You can check that by using a meter connected to a copper water line where the hot should be 120 and neutral = nothing [maybe needing a very long wire to reach the water line ] ?but? if the wiring has no ground wire? things get messy as the an ungrounded polarized receptacle is likely hard to get.? You should most likely ?install a 3-wire cable. I am too far out of date to know what the codes allow now when updating older houses.

?

From: [email protected] [mailto:[email protected]] On Behalf Of Waldo Magnuson via groups.io
Sent: Wednesday, January 1, 2025 3:51 PM
To: [email protected]
Subject: [HallicraftersRadios] 2-wire, unpolarized outlet ?

?

My house was built in 1955 and has several outlets that are unpolarized outlets. If I replace an outlet with a 2-prong polarized outlet (neutral opening larger than the hot opening) how do tell which wire is hot?
Thanks.
Skip Magnuson


--
don??? va3drl
2-wire, unpolarized outlet ?

 

My house was built in 1955 and has several outlets that are unpolarized outlets. If I replace an outlet with a 2-prong polarized outlet (neutral opening larger than the hot opening) how do tell which wire is hot?
Thanks.
Skip Magnuson
Re: SR-150 PWR Supply

 

Thanks,

I can make the power supply the common point ground or run a ground from both radio?and power supply to the operating table ground buss. I don't expect to have 60hz AC and if so I'll rework the mic audio circuit, not the chassis earth ground.? The breaker panel is less than 4ft away and the operating position ground buss bar is tied to the breaker panel ground whose ground rod is less than 6ft away.? In the SR-2000 the mic audio is a straight run to the audio tube. Not sure if the shielded mic line is grounded at the mic jack or not but hum is easy enough to remedy if it pops up... Lots of fun in 2025.

73
dave
wa3gin

On Wed, Jan 1, 2025 at 11:30?AM Jack Brabham - KZ5A via <kz5a.jack=[email protected]> wrote:
I just finished a complete rebuild on my? PS 150-120.? I choose to stay with a 2 prong polarized power cord mostly due to Walter Cates recommendation to avoid 60hz hum on the TX.? ?Didn't see why at first but I think I've codgertated it out.? ?The TRX? and PS were designed together and? the TX is intended to be the common signal ground point for both.? With? a 2? prong polarized plug and cord this works fine but will not support a GFI.? ?
?
If you add? a? 3 prong? cord to? the PS the 60hz current passed? by C201 and C202 appears on the electrical Ground and can be passed to the electrical Common via the main AC breaker box? where the 2 are terminated to the same buss.? ?This can appear as a 60hz potential between a station RF ground and the electrical Common which apparently can find it's way into the TX audio.
?
This is no doubt highly situational depending? on house and station wiring.? ?If you use a 3 prong AC cord and encounter the hum, deleting C201 and C202 might fix it.? Also the 60hz current passed onto the electrical Ground by the capacitors? could? trip a GFI considering that is the current they are intended to sense.??
?
A ferrite on the power cord can functionally? replace? the caps.
?
73 Jack KZ5A
?
?
?
Re: SR-150 PWR Supply

 

I just finished a complete rebuild on my? PS 150-120.? I choose to stay with a 2 prong polarized power cord mostly due to Walter Cates recommendation to avoid 60hz hum on the TX.? ?Didn't see why at first but I think I've codgertated it out.? ?The TRX? and PS were designed together and? the TX is intended to be the common signal ground point for both.? With? a 2? prong polarized plug and cord this works fine but will not support a GFI.? ?
?
If you add? a? 3 prong? cord to? the PS the 60hz current passed? by C201 and C202 appears on the electrical Ground and can be passed to the electrical Common via the main AC breaker box? where the 2 are terminated to the same buss.? ?This can appear as a 60hz potential between a station RF ground and the electrical Common which apparently can find it's way into the TX audio.
?
This is no doubt highly situational depending? on house and station wiring.? ?If you use a 3 prong AC cord and encounter the hum, deleting C201 and C202 might fix it.? Also the 60hz current passed onto the electrical Ground by the capacitors? could? trip a GFI considering that is the current they are intended to sense.??
?
A ferrite on the power cord can functionally? replace? the caps.
?
73 Jack KZ5A
?
?
?
Re: SR-150 PWR Supply

 

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Hi dave? ya it seems the Sr-150 was made from 1961? to 63? so designed just before polarized outlets were required.

I have used GFCIs for years especially for power tools and especially outdoors or in the basement.

Once I thought a GFCI on an “extension cord ”? was tripping with a kettle as a load and thought the GFCI was bad, so I plugged the kettle directly into the wall and it blew a big hole in the enamel of the stove.? The wire in the kettle was running along the bottom and had melted the insulation.

Ohh I recall in 1966 we used lots of cheaters in the plant when all the [new] scopes suddenly came with 3 prong plugs, and the plant was old.

?

From: [email protected] [mailto:[email protected]] On Behalf Of Dave Jordan via groups.io
Sent: Tuesday, December 31, 2024 10:35 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] SR-150 PWR Supply

?

Haha, I wondered about both and not worried about it!?I hate GFIs and all the other?rip-offs EATON?and HomeDespot have devised to extract my money from my pocket.? I'm trying to adapt to having pink cerromax in the ham shack!

?

Ungrounded two-prong outlets are typically only found in older homes.?Since 1962, the National Electric Code (NEC) has prohibited them in new construction?to minimize the risk of electric shock and electrical equipment damage.?

?

I'd bet Hallicrafters had the design for the SR-150 on the drawing board long before 1962.?

?

Best,

dave

wa3gin

?

?

?


--
don??? va3drl
Re: SR-150 PWR Supply

 
Edited

Haha, I wondered about both and not worried about it!?I hate GFIs and all the other?rip-offs EATON?and HomeDespot have devised to extract my money from my pocket.? I'm trying to adapt to having pink cerromax in the ham shack!
?
Ungrounded two-prong outlets are typically only found in older homes.?Since 1962, the National Electric Code (NEC) has prohibited them in new construction?to minimize the risk of electric shock and electrical equipment damage.?

I'd bet Hallicrafters had the design for the SR-150 on the drawing board long before 1962.?

Best,
dave
wa3gin



On Tue, Dec 31, 2024 at 9:56?PM don Root via <drootofallevil=[email protected]> wrote:

Well Dave. if in 1963 you had? one slot smaller than the other, you were ahead of the game; the house I am in [1956] was all non polarized, except for the Garage, washing machine and outdoor outlets.

?

The drawing indicates nothing about any polarity for the PS 150.?

if I were putting a new 2 wire polarized plug ?and cord and on one, ?the hot would go to the fuse as you mentioned ?.

?

of course the chassis/cabinet will tend to float at ?some ?midway voltage due to the ?two 1400 volt line caps connect to ground also, just as before

?

I would have a little dilemma ?if I were putting a ?new 3 wire ?plug ?and cord on one, as where would the ground wire go? Other than the chasses?

But then it would connect? Neutral to ground, and that would defeat the intent of the NEC code ?and GFCI on that circuit.? ?

?

enddd

From: [email protected] [mailto:[email protected]] On Behalf Of Dave Jordan via
Sent: Tuesday, December 31, 2024 8:14 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] SR-150 PWR Supply

?

Ok, but for me during my ham years starting in 1963 the smaller of the two socket openings was always hot. The smooth side of the cord was always hot as well.?

?

Funny how time seems to change things…but those standards remain the same even today.?

?

Happy New Year

Dave

Wa3gin

?


--
don??? va3drl

Re: SR-150 PWR Supply

 
Edited

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Well Dave. if in 1963 you had? one slot smaller than the other, you were ahead of the game; the house I am in [1956] was all non polarized, except for the Garage, washing machine and outdoor outlets.

?

The drawing indicates nothing about any polarity for the PS 150.?

if I were putting a new 2 wire polarized plug ?and cord and on one, ?the hot would go to the fuse as you mentioned ?.

?

of course the chassis/cabinet will tend to float at ?some ?midway voltage due to the ?two 1400 volt line caps connect to ground also, just as before

?

I would have a little dilemma ?if I were putting a ?new 3 wire ?plug ?and cord on one, as where would the ground wire go? Other than the chasses?

But then it would connect? Neutral to ground, and that would defeat the intent of the NEC code ?and GFCI on that circuit.? ?

?

enddd

From: [email protected] [mailto:[email protected]] On Behalf Of Dave Jordan via groups.io
Sent: Tuesday, December 31, 2024 8:14 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] SR-150 PWR Supply

?

Ok, but for me during my ham years starting in 1963 the smaller of the two socket openings was always hot. The smooth side of the cord was always hot as well.?

?

Funny how time seems to change things…but those standards remain the same even today.?

?

Happy New Year

Dave

Wa3gin

?


--
don??? va3drl
Re: SR-150 PWR Supply

 

Ok, but for me during my ham years starting in 1963 the smaller of the two socket openings was always hot. The smooth side of the cord was always hot as well.?

Funny how time seems to change things…but those standards remain the same even today.?

Happy New Year
Dave
Wa3gin

On Tue, Dec 31, 2024 at 8:04?PM don Root via <drootofallevil=[email protected]> wrote:

Dave,? ya… 4 more hours and the year is Gone.

?

Back when this stuff was made,? the identity of hot and neutral should have made it to the back of the outlet but there was no such identity at the front so the idea of hot and neutral? did not make it into a radio or anything? using a normal outlet.?

Once you/we ?modify the cord and Outlet to be polarized we have a new situation so a fuse can be put in the “hot”? wire. etc

?

From: [email protected] [mailto:[email protected]] On Behalf Of Dave Jordan via
Sent: Tuesday, December 31, 2024 5:49 PM
To: [email protected]
Subject: [HallicraftersRadios] SR-150 PWR Supply

?

?

Hi Folks, Happy New Year,

?

Replacing a garbage 18 gauge AC cord that someone installed in the power supply.? I see the guy wired the neutral side to the fuse. I always thought the hot side went to the fuse, just like in the breaker panel.?

?

In a 110 VAC line,?the "hot" wire should always be connected to the fuse in a device, not the neutral wire;?meaning the fuse should be placed on the side of the line carrying the live current.?

Explanation:

·?????? Safety:

Placing the fuse on the hot wire ensures that when a fault occurs and the fuse blows, the appliance is completely de-energized, preventing potential shock hazards if someone touches the device while it's faulty.

Thoughts Welcome,

dave

wa3gin


--
don??? va3drl

Re: SR-150 PWR Supply

 

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Dave,? ya… 4 more hours and the year is Gone.

?

Back when this stuff was made,? the identity of hot and neutral should have made it to the back of the outlet but there was no such identity at the front so the idea of hot and neutral? did not make it into a radio or anything? using a normal outlet.?

Once you/we ?modify the cord and Outlet to be polarized we have a new situation so a fuse can be put in the “hot”? wire. etc

?

From: [email protected] [mailto:[email protected]] On Behalf Of Dave Jordan via groups.io
Sent: Tuesday, December 31, 2024 5:49 PM
To: [email protected]
Subject: [HallicraftersRadios] SR-150 PWR Supply

?

?

Hi Folks, Happy New Year,

?

Replacing a garbage 18 gauge AC cord that someone installed in the power supply.? I see the guy wired the neutral side to the fuse. I always thought the hot side went to the fuse, just like in the breaker panel.?

?

In a 110 VAC line,?the "hot" wire should always be connected to the fuse in a device, not the neutral wire;?meaning the fuse should be placed on the side of the line carrying the live current.?

Explanation:

·?????? Safety:

Placing the fuse on the hot wire ensures that when a fault occurs and the fuse blows, the appliance is completely de-energized, preventing potential shock hazards if someone touches the device while it's faulty.

Thoughts Welcome,

dave

wa3gin


--
don??? va3drl
Re: SR-150 PWR Supply

 

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Many radios back in the day were wired this way.

?

I always change them over to a 3-wire line cord, fuse in the line side as well as the line going to the on/off switch. Any capacitors on the line or neutral get replaced with AC rated line / neutral caps

?

Tom

W3TA

?

From: [email protected] <[email protected]> On Behalf Of Dave Jordan via groups.io
Sent: Tuesday, December 31, 2024 5:49 PM
To: [email protected]
Subject: [HallicraftersRadios] SR-150 PWR Supply

?

?

Hi Folks, Happy New Year,

?

Replacing a garbage 18 gauge AC cord that someone installed in the power supply.? I see the guy wired the neutral side to the fuse. I always thought the hot side went to the fuse, just like in the breaker panel.?

?

In a 110 VAC line,?the "hot" wire should always be connected to the fuse in a device, not the neutral wire;?meaning the fuse should be placed on the side of the line carrying the live current.?

Explanation:

  • Safety:

Placing the fuse on the hot wire ensures that when a fault occurs and the fuse blows, the appliance is completely de-energized, preventing potential shock hazards if someone touches the device while it's faulty.

Thoughts Welcome,

dave

wa3gin
SR-150 PWR Supply

 


Hi Folks, Happy New Year,

Replacing a garbage 18 gauge AC cord that someone installed in the power supply.? I see the guy wired the neutral side to the fuse. I always thought the hot side went to the fuse, just like in the breaker panel.?

In a 110 VAC line,?the "hot" wire should always be connected to the fuse in a device, not the neutral wire;?meaning the fuse should be placed on the side of the line carrying the live current.?
Explanation:
  • Safety:
    Placing the fuse on the hot wire ensures that when a fault occurs and the fuse blows, the appliance is completely de-energized, preventing potential shock hazards if someone touches the device while it's faulty.
Thoughts Welcome,
dave
wa3gin
Re: S-38C Question

 

If the neutral side of the line is directly connected to the chassis and the hot side is now connected to the ON/OFF switch, what is to be done if the AC hum or other noise picked up from the AC line is now worse?? The idea behind the original wiring was to keep the high side of the AC line away from the high impedance and gain of the audio amplifier circuit since the ON/OFF switch is located on the volume control.

I do not believe that the NEC controls how a manufacturer connects to the AC line, that is the responsibility of the Underwriters Laboratory.? At the time the AA5s were made, they received the U/L sticker.? If one is concerned about a shock hazard form an AA5 radio, one can always connect it to a GFCI outlet.? It will trip when the current imbalance between the hot and neutral is greater then 15 mA.

My workshop is in the basement.? All of the outlets in the basement are GFCI protected because of the concrete floor.
HNY,?
Jim

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


On Monday, December 30, 2024 at 08:41:00 AM CST, Michael McCarthy, W1NR via groups.io <lists@...> wrote:


I should have added that changing to a polarized plug requires re-wiring
the on/off switch. Not needed if the chassis passes the "hot" test. See


On 12/30/2024 9:17 AM, Michael McCarthy, W1NR via groups.io wrote:
Value is not critical, but voltage rating needs attention. I would use a
250v A.C. rated disc ceramic, or else one with a rating greater than
1000v D.C. I would also check (or replace) the resistor R22 and
capacitor C24 as these have probably aged as well.

Next, be sure it has a polarized plug with hot going to the switch. Even
though it is not considered a "hot chassis" radio, hot side should be
switched for maximum safety.
--
73 de Mike, W1NR

THAT was the equation. EXISTENCE!... SURVIVAL... must cancel out...
programming!

- Ruk -

Re: S-38C Question

 

I should have added that changing to a polarized plug requires re-wiring
the on/off switch. Not needed if the chassis passes the "hot" test. See


On 12/30/2024 9:17 AM, Michael McCarthy, W1NR via groups.io wrote:
Value is not critical, but voltage rating needs attention. I would use a
250v A.C. rated disc ceramic, or else one with a rating greater than
1000v D.C. I would also check (or replace) the resistor R22 and
capacitor C24 as these have probably aged as well.

Next, be sure it has a polarized plug with hot going to the switch. Even
though it is not considered a "hot chassis" radio, hot side should be
switched for maximum safety.
--
73 de Mike, W1NR

THAT was the equation. EXISTENCE!... SURVIVAL... must cancel out...
programming!

- Ruk -
Re: S-38C Question

 

Value is not critical, but voltage rating needs attention. I would use a
250v A.C. rated disc ceramic, or else one with a rating greater than
1000v D.C. I would also check (or replace) the resistor R22 and
capacitor C24 as these have probably aged as well.

Next, be sure it has a polarized plug with hot going to the switch. Even
though it is not considered a "hot chassis" radio, hot side should be
switched for maximum safety.


On 12/30/2024 1:20 AM, Howard wrote:
Hey guys, was just about to replace the power supply filter in my
S-38C.? opened it up and found a blown up bumblee capacitor.?? The cap
in question is C-27? a .02uF @600v? which goes from one side of the line
to the common ground ( NOT chassis ground).
My question is, can this be replaced with a .047 uF "safety" capacitor,
or is the value of .02uF critical?
Please let me know as I do want to keep the old beast running.
Thank you.
Howard
_._,_._,_
--
73 de Mike, W1NR

THAT was the equation. EXISTENCE!... SURVIVAL... must cancel out...
programming!

- Ruk -
Re: S-38C Question

 

The value is not critical. The .047 safety cap should be fine.


73
Bob "Kirk"
W?HNV


On Mon, Dec 30, 2024 at 12:20?AM Howard via <n9ktw=[email protected]> wrote:
Hey guys, was just about to replace the power supply filter in my S-38C.? opened it up and found a blown up bumblee capacitor.?? The cap in question is C-27? a .02uF @600v? which goes from one side of the line to the common ground ( NOT chassis ground).
?
My question is, can this be replaced with a .047 uF "safety" capacitor, or is the value of .02uF critical?
?
Please let me know as I do want to keep the old beast running.
?
Thank you.
?
?
Howard
S-38C Question

 

Hey guys, was just about to replace the power supply filter in my S-38C.? opened it up and found a blown up bumblee capacitor.?? The cap in question is C-27? a .02uF @600v? which goes from one side of the line to the common ground ( NOT chassis ground).
?
My question is, can this be replaced with a .047 uF "safety" capacitor, or is the value of .02uF critical?
?
Please let me know as I do want to keep the old beast running.
?
Thank you.
?
?
Howard
Re: 1Re: TinySA Ultra follow-up

 

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The advantage of buying from a domestic reseller is that you have a return avenue in the event of a problem.? You may or may not need that of course.? But if you do, then you are able to speak to someone who's native language is the same as yours, and the costs for sending thing thing back for exchange by post are reasonable and the paperwork things like HS codes and customs clearance, etc, are absent.

For those reasons I tend to put these purchases into two categories - if getting one that is partially inop or DOA would result in disposal instead of wanting to remedy it, then I'll buy from Aliexpress and save the money.? But if it's going to be something I will rely on or that is too expensive to toss if it's a problem, then I'll want to buy from a domestic seller.

Good luck!

73/jeff/ac0c
alpha-charlie-zero-charlie
On 12/29/2024 9:26 AM, jeffbauman via groups.io wrote:

So is paying more gunna protect me any more?
?
Thomas, no.?
?
But I, for one, don't mind throwing a few extra bucks at a purchase from a US-based brick & mortar seller.?
?
Sure was nice to drive 10 minutes to Radio Shack for that switch, transistor,? or relay I needed for my project.?
?
YMMV
?
73,
Jeff
W8KZW?
?
Boatanchors since 1965
Re: 1Re: TinySA Ultra follow-up

 

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Yupper…yes it was!?? TU!

?

STAY SAFE AND STAY WELL!

?

Respectfully,

Thomas K. Lanieri, NU2W

NJ DOH Licensed EMT;?

PHTLS, AMLS, PHPEC

Millenium EMS

ARC N.E. BioMedical Services

ARC N.E. Disaster Cycle Services

?

From: [email protected] <[email protected]> On Behalf Of jeffbauman via groups.io
Sent: Sunday, December 29, 2024 10:26 AM
To: [email protected]
Subject: [HallicraftersRadios] 1Re: TinySA Ultra follow-up

?

So is paying more gunna protect me any more?

?

Thomas, no.?

?

But I, for one, don't mind throwing a few extra bucks at a purchase from a US-based brick & mortar seller.?

?

Sure was nice to drive 10 minutes to Radio Shack for that switch, transistor,? or relay I needed for my project.?

?

YMMV

?

73,

Jeff

W8KZW?

?

Boatanchors since 1965
Re: SX-117 HT-44 and PS-150-120 for sale

 

I went ahead and recapped the power supply anyway. ?I had forgot I orders the caps for it a while back.?
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