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AC-4 Power Supply 10K Bias Trimmer Replacement

 

I purchased an AC-4 power supply and noticed one of the 3 lugs was snapped off.
Lots of 10Ks out there, but not with two mounting fins for the case.
?
Has anyone replaced these and found a suitable replacement?
?
Many thanks! 73.
--
Joe - W7BWA
Custer, WA
 

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Hi Joe,

Try oldradioparts.net. Mark Oppat stocks literally thousands of potentiometers in every possible configuration, and will even customize them for you if needed. Very reasonable prices for unobtainium parts.

73,
Graham N6GH



On Feb 3, 2025, at 3:17?PM, Joe W7BWA via groups.io <W7BWA@...> wrote:

?
I purchased an AC-4 power supply and noticed one of the 3 lugs was snapped off.
Lots of 10Ks out there, but not with two mounting fins for the case.
?
Has anyone replaced these and found a suitable replacement?
?
Many thanks! 73.
--
Joe - W7BWA
Custer, WA
 

Why do the mounting fins matter?

The more common lockwasher and nut mount seems to be an OK replacement.

Thanks,

KD4E

Hi Joe,

Try oldradioparts.net. Mark Oppat stocks literally thousands of potentiometers in every possible configuration, and will even customize them for you if needed. Very reasonable prices for unobtainium parts.

73,
Graham N6GH

On Feb 3, 2025, at 3:17?PM, Joe W7BWA via groups.io <W7BWA@...> wrote:
?
I purchased an AC-4 power supply and noticed one of the 3 lugs was snapped off.
Lots of 10Ks out there, but not with two mounting fins for the case.
Has anyone replaced these and found a suitable replacement?
Many thanks! 73.
--
Joe - W7BWA
Custer, WA
 

Thanks David.
Only that the holes are there and I wanted to replace it with what is there as the shaft is very short.
?
The main thing is finding a suitable replacement and Mouser seems stumped to one.
--
Joe - W7BWA
Custer, WA
 

I'll try that. Thanks!
--
Joe - W7BWA
Custer, WA
 

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A bit late to this thread.? Drake seem to use a lot of the CTS 450 series pots.? I would guess the pot in the AC4 is a CTS 450 series.? You could get one of these from Mouser and swap out the wafer.? ??? Just be careful not to break any of the tabs securing the wafer when you take the pots apart, replace the wafer on the short shaft pot and put it back together.

73

Stan
KM4HQE




On 2/8/25 19:07, Joe W7BWA via groups.io wrote:

Thanks David.
Only that the holes are there and I wanted to replace it with what is there as the shaft is very short.
?
The main thing is finding a suitable replacement and Mouser seems stumped to one.
--
Joe - W7BWA
Custer, WA
 

You can find about of the same make and size and move the insides to the old enclosure.?

I have done this with several different pots.?

Steve Wedge, W1ES

Time flies like an arrow. Fruit flies like a banana.


Sent from for iOS


On Sat, Feb 8, 2025 at 20:07, Joe W7BWA via groups.io <W7BWA@...> wrote:
Thanks David.
Only that the holes are there and I wanted to replace it with what is there as the shaft is very short.
?
The main thing is finding a suitable replacement and Mouser seems stumped to one.
--
Joe - W7BWA
Custer, WA

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