Re: Bristol L-wrench kit, set of 9
I have and use the Xcelite Bristol/spline wrench set with torque amplifier handle. Best for the long reach so often required. I also have a bunch of the L wrenches gleaned over a long time from working around avionics and mil radio sets. Used to keep one of the small canvas wrench kits in the plane to fix pesky loose knobs. Thank God they were used, vice Allen wrenches, on radios when they are old and never before removed!!? ART-13 knobs.... especially.
Jeep K3HVG
On 03/29/2024 12:23 AM EDT Richard Knoppow <1oldlens1@...> wrote:
?
?
The 45 below is some sort of typo. Should read Set of L wrenches
without number. There are 9 keys in a blue plastic bag.
On 3/28/2024 7:01 PM, Richard Knoppow wrote:
Bristol is still in business. I seem to remember I bought my set
of45 L wrenches directly from them via the web. I also have a set of
Xcelite Bristol wrenches. These are very useful for getting into tight
spots. The set includes an extender. For instance, I can not get to the
set screws on the kilocycle dial on my R-388 with the standard L
wrenches but its easy with the Xcelite drivers. Not cheap but they last
forever.
On 3/20/2024 5:11 PM, jeffpers8 via groups.io wrote:
Another source.
<>
< <https://www.mcmaster.com/7048A54/>>
|
Re: SX-100 Repair Problems - Bumblebees!
Jacques , I have been trying to find out about the Sprague product line from the 1948, 1949 ??telecaps? ..black beauty? and onto the hcx?? and difilm but it is not so simple. Anyhow I ran into that ad, and what surprised me is that THEY knew how sensitive most caps are to moisture. Presumable you know these are mostly HCX caps their trademark for ??? As usual, more questions than answers. PS, ?thanks for your other stuff. I¡¯m trying to digest it, but cant keep up with you guys. ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Jacques_VE2JFE
Sent: Friday, March 29, 2024 12:21 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] SX-100 Repair Problems - Bumblebees!
Importance: High? Thank you for having find this, Don. I have many Sprague 160P in my capacitors bins and they all survived, 60 + years after they were made. My actual limit of leakage detection is 10nA at the WVDC of the tested capacitors. That represent, for ex., a resistance of 60,000 Meg ohms with 600V applied. All modern capacitors (polyester or polypropylene) exhibit that almost inexistant leakage behavior. BUT The graph attached represent the actual MOISTURE resistance under the given test conditions, but does not give any information about the dielectric degradation, measured in years¡ Not sure that the curve ¡°E¡± is applicable to recent manufactured polyester dielectric capacitors, however. I did not read any information, anywhere, saying that they are moisture sensitive. But, this is 1960 advertising, and we do not know what are the other brands of capacitors compared with the DIFILM ones, or their manufactured value. And, above all, I did not think that, in 1960, Sprague engineers were able to predict that their ¡°new¡± 160P capacitors will still be useable 65 years later. ? 73, Jacques, VE2JFE in Montreal ? Here is an interesting Srpague chart from 1960 advertising. Below is just a fragment pdf 7-- --
don??? va3drl -- don??? va3drl
|
Re: SX-100 restore project
FWIW, in my mispent youth I worked for Hewlett-Packard, mostly on RF
gear. We washed equipment, simple washing but followed by a long baking
out process. Typically a minimum of 48 hours at about 130F. All water
damageable parts were removed first. I would not wash any equipment
unless you have the means for a long baking out. I usually left stuff in
the oven for three or four days. We used a thermostatically controlled
electric oven. Unless you can bake gear out I would not recommend
washing. Mostly, as others have said you can clean well enough using
brushes etc.
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On 3/20/2024 7:02 PM, peteradio@... via groups.io wrote: Keith,
Which CRC product did you use?
73's
Pete
W8AA
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
|
Re: Bristol L-wrench kit, set of 9
The 45 below is some sort of typo. Should read Set of L wrenches
without number. There are 9 keys in a blue plastic bag.
toggle quoted message
Show quoted text
On 3/28/2024 7:01 PM, Richard Knoppow wrote: Bristol is still in business. I seem to remember I bought my set
of45 L wrenches directly from them via the web. I also have a set of
Xcelite Bristol wrenches. These are very useful for getting into tight
spots. The set includes an extender. For instance, I can not get to the
set screws on the kilocycle dial on my R-388 with the standard L
wrenches but its easy with the Xcelite drivers. Not cheap but they last
forever.
On 3/20/2024 5:11 PM, jeffpers8 via groups.io wrote:
Another source.
<>
< <>
_._,_._,_
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
|
Re: SX-100 Repair Problems - Bumblebees!
Thank you for having find this, Don. I have many Sprague 160P in my capacitors bins and they all survived, 60 + years after they were made. My actual limit of leakage detection is 10nA at the WVDC of the tested capacitors. That represent, for ex., a resistance of 60,000 Meg ohms with 600V applied. All modern capacitors (polyester or polypropylene) exhibit that almost inexistant leakage behavior. BUT The graph attached represent the actual MOISTURE resistance under the given test conditions, but does not give any information about the dielectric degradation, measured in years¡ Not sure that the curve ¡°E¡± is applicable to recent manufactured polyester dielectric capacitors, however. I did not read any information, anywhere, saying that they are moisture sensitive. But, this is 1960 advertising, and we do not know what are the other brands of capacitors compared with the DIFILM ones, or their manufactured value. And, above all, I did not think that, in 1960, Sprague engineers were able to predict that their ¡°new¡± 160P capacitors will still be useable 65 years later. ? 73, Jacques, VE2JFE in Montreal ? Here is an interesting Srpague chart from 1960 advertising. Below is just a fragment pdf 7-- --
don??? va3drl
|
Re: SX-100 Repair Problems - Bumblebees!
Here is an interesting Srpague chart from 1960 advertising. Below is just a fragment pdf 7-- +++++++++++ ? -- don??? va3drl
|
Keith ???here is one for pots ??? -- don??? va3drl
|
I did have to order it. Called a musician friend of mine and asked if they had it at the guitar center.
I knew he used deoxit on his vintage amps all the time.
Said the center only carried regular deoxit.
Amazon will have it here MOnday
|
Re: Bristol L-wrench kit, set of 9
Bristol is still in business. I seem to remember I bought my set
of45 L wrenches directly from them via the web. I also have a set of
Xcelite Bristol wrenches. These are very useful for getting into tight
spots. The set includes an extender. For instance, I can not get to the
set screws on the kilocycle dial on my R-388 with the standard L
wrenches but its easy with the Xcelite drivers. Not cheap but they last
forever.
toggle quoted message
Show quoted text
On 3/20/2024 5:11 PM, jeffpers8 via groups.io wrote: Another source.
<>
_._,_._,_
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
|
You might have to get it off the web. It has a lubricant in it. Its
possible the pot has a worn spot on the resistance track, have to
replace it but the Faderlube might fix it and is worth a try.
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On 3/28/2024 6:00 PM, Keith wrote: I will do that Richard.
Will check at our local guitar shop and see if they have it.
I used regular DeOxit on it and it did help somewhat.
Think the S meter is not 100% either. May rob another one from another
chassis I have.
All the SX 96, 99 and 100 meters look identical. Hopefully they are
electrically as well.
I have a spare from a SX99, but will clean this one good first.
When trying to calibrate the S meter, it acted very erratic when I used
the rear pot to zero it after jumpering the antenna terminals.
That pot may need a good cleaning also. So will try that first.
Just tickled me to actually get audio out of it tonight.
I really appreciate all the pointers.
Small steps as I go.
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
|
Bill
I have not completed an alignment just yet. Thats next on the list.
Will have a good bit of time on Saturday to spend with it.
Got all my needed items to do it ready on the bench.
Keith
|
Good idea Don. I have things to jumper it out. Least? let me get an alignment going and see where it stands.
I am just tickled to get audio. I really want to get this one playing.
|
I will do that Richard.
Will check at our local guitar shop and see if they have it.
I used regular DeOxit on it and it did help somewhat.
Think the S meter is not 100% either. May rob another one from another chassis I have.
All the SX 96, 99 and 100 meters look identical. Hopefully they are electrically as well.
I have a spare from a SX99, but will clean this one good first.?
When trying to calibrate the S meter, it acted very erratic when I used the rear pot to zero it after jumpering the antenna terminals.
That pot may need a good cleaning also. So will try that first.
Just tickled me to actually get audio out of it tonight.
I really appreciate all the pointers.?
Small steps as I go.
|
Try Deoxit Fader Lube or whatever they call it now. It will often
bring back bad pots.
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On 3/28/2024 4:42 PM, Keith wrote: I think may stumbled on to the issue. Faulty volume control.
Injecting a 1000khz signal at the antenna. Using internal modulation
from the IG102. ?Messing with the volume control, I suddenly got the
tone. It¡¯s dropping in and out when messing with the volume control,
?will clean that pot really well but very well may have a I replace it.
Feel like I may have accomplished something this evening
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
|
Hi Keith, it sounds like it is on the poor side of iffy.? No surprise there. Perhaps you can jump the pot with something like 500k ,or 100k,or ???50k ???ohms and do any other listening tests before taking on the pot. It could broken at one spot or erratic there or the whole thing worn and erratic. ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Keith
Sent: Thursday, March 28, 2024 7:49 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] SX-100 phono input? Nope. ?Not deaf. ?Actually receiving my local talk radio station now. Think it¡¯s the volume pot is iffy. -- don??? va3drl
|
Nope. ?Not deaf. ?Actually receiving my local talk radio station now. Think it¡¯s the volume pot is iffy.
?
Using screwdriver touch the center post on the volume control.? If you hear a click or noise then everything after the control is working. The phono jack is usually just before the volume control.? But after the IF.? To be heard you need just the audio tone.
Have you completed an alignment?? The IF can be so far off that the radio can be deaf.
Bill
On Thursday, March 28, 2024 at 04:40:06 PM EDT, Keith <kd4avp@...> wrote:
Question for the group....
Will be working on the SX100 again this weekend.?
I am not getting any sound from the speaker.
As stated before, I tap across the 6k6 pin and get some static on the speaker.
Would it make sense to feed an modulated signal into the phono input to just see if it makes noise?
Use my IG102 signal generator and either internal modulation or another tone generator into the IG102.
|
Using screwdriver touch the center post on the volume control.? If you hear a click or noise then everything after the control is working. The phono jack is usually just before the volume control.? But after the IF.? To be heard you need just the audio tone.
Have you completed an alignment?? The IF can be so far off that the radio can be deaf.
Bill
On Thursday, March 28, 2024 at 04:40:06 PM EDT, Keith <kd4avp@...> wrote:
Question for the group....
Will be working on the SX100 again this weekend.?
I am not getting any sound from the speaker.
As stated before, I tap across the 6k6 pin and get some static on the speaker.
Would it make sense to feed an modulated signal into the phono input to just see if it makes noise?
Use my IG102 signal generator and either internal modulation or another tone generator into the IG102.
|
I think may stumbled on to the issue. Faulty volume control. Injecting a 1000khz signal at the antenna. Using internal modulation from the IG102. ?Messing with the volume control, I suddenly got the tone. It¡¯s dropping in and out when messing with the volume control, ?will clean that pot really well but very well may have a I replace it.? Feel like I may have accomplished something this evening
?
What instruments do you have? I think you said in another post on this thread that you have an oscillator. I think I would start by putting a tone into the phono jack and setting the selector switch for "Phono". That will test the entire audio circuit. If you get a tone out you can search earlier circuits for trouble. If not see if you can find out where the signal is being stopped. A scope, if you have one, is the ideal tracing tool. First make sure the signal is getting to the 6SC7 first audio. There is a switch there for function. If you go directly to the top of the volume control pot it will eliminate the switch. If you have a scope this is also a good place to see if there is any signal getting to the audio. Signal tracing is a very powerful method of trouble shooting. Usual first steps in trouble shooting are: 1, Do the resistance readings. The values in the chart are not always correct especially where there is a capacitor in the circuit but will often give you a clue as to the source of trouble and can't damage anything. 2, Do the voltage measurements. While there are sometimes errors on the voltage charts large deviations from indicated voltages are a good clue as to trouble. After that signal tracing is the most powerful tool. Start at one end and to to the other. Where there are block diagrams they can be very helpful. Trouble shooting is not exactly an art, it follows logic, start in one place and don't allow yourself to get scattered. Have someone else do a visual inspection, its very easy to miss even very obvious things. There is more but I think that's enough for now. Good luck or perhaps I should say Success. -- Richard Knoppow Los Angeles WB6KBL SKCC 19998
|
Listing electronic items (exotic tubes)
For Bill, system manager,
Hi Bill,
? ?A ham friend, now SK, left me some tubes, cables, antenna switches, etc., is it okay to list them on the forum?
Most tubes are exotic or high-power ones I don¡¯t recognize (Amperex 866AX, Tung-Sol JAN CAHG 4B32, plus others). Listing prices will be minimal, a dollar plus shipping. ?I¡¯ll be brief and don¡¯t want to violate the forum rules.
Skip Magnuson ?W7WGM
|
What instruments do you have? I think you said in another post on
this thread that you have an oscillator. I think I would start by
putting a tone into the phono jack and setting the selector switch for
"Phono". That will test the entire audio circuit. If you get a tone out
you can search earlier circuits for trouble. If not see if you can find
out where the signal is being stopped. A scope, if you have one, is the
ideal tracing tool. First make sure the signal is getting to the 6SC7
first audio. There is a switch there for function. If you go directly to
the top of the volume control pot it will eliminate the switch. If you
have a scope this is also a good place to see if there is any signal
getting to the audio. Signal tracing is a very powerful method of
trouble shooting.
Usual first steps in trouble shooting are:
1, Do the resistance readings. The values in the chart are not always
correct especially where there is a capacitor in the circuit but will
often give you a clue as to the source of trouble and can't damage anything.
2, Do the voltage measurements. While there are sometimes errors on the
voltage charts large deviations from indicated voltages are a good clue
as to trouble.
After that signal tracing is the most powerful tool. Start at one
end and to to the other.
Where there are block diagrams they can be very helpful.
Trouble shooting is not exactly an art, it follows logic, start in
one place and don't allow yourself to get scattered.
Have someone else do a visual inspection, its very easy to miss even
very obvious things. There is more but I think that's enough for now.
Good luck or perhaps I should say Success.
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
|
don Root
Jacques_VE2JFE