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Old 19th June 2013, 06:08 PM   #1
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Default pot--trying to find

trying to find this pot:
it's dual with what looks like 8pins. it is a volume control pot for an old hk730. can anyone help me with finding a replacement?

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Old 19th June 2013, 07:12 PM   #2
Mooly is offline Mooly  United Kingdom
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The "extra" connections will be for a loudness compensation circuit which means finding a replacement will be difficult/maybe impossible. A standard pot will work OK but you lose that loudness feature which seemed popular on amps of a certain vintage.

What's wrong with the pot ?

If its noisy and crackly then I would say that one of that style could be opened up successfully. You have to bend the metal tabs back to disassemble but it should be do-able. The carbon track is cleaned with iso on a cotton bud and the wiper cleaned, re-tensioned and bent slightly so that it runs across unused carbon track.

If you want to fit a normal dual gang replacement then you need one of the correct value (resistance) and of the correct "taper" which is logarithmic for a volume pot.
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Old 19th June 2013, 07:35 PM   #3
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the pot sticks. it doesn't crackle. its hard to turn.
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Old 19th June 2013, 08:06 PM   #4
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Perhaps you can find this variant of this potentiometer ( photo in the attachment) .
I found this in a local shop in India.

I asked for centre-tapped dual potentiometer and they instantly gave it.

It's 80+20K. I used that in my discrete audio amp kit earlier. It is used to implement the loudness effect as Mooly rightly pointed out.

All the very best.
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Old 19th June 2013, 08:20 PM   #5
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One word: ebay. There are sellers there who deal only with audio parts, used and new. I can look for you later on, but it's pretty straight-forward.

Also, I remember correcting sticky pot shafts but simply heating it over s lighter. Maybe a matter of a few seconds, enough to liquify the grease. It might return back to its "sticky" state sometime thereafter.
Kudos on saving a vintage piece of audio.
I have a HK 495i that's my "daily driver". The only problem I find with it is the leakage in the switching path between TAPE 1 and TAPE 2.
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Old 19th June 2013, 10:39 PM   #6
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Quote:
Originally Posted by csom View Post
Perhaps you can find this variant of this potentiometer ( photo in the attachment) .
I found this in a local shop in India.

I asked for centre-tapped dual potentiometer and they instantly gave it.

It's 80+20K. I used that in my discrete audio amp kit earlier. It is used to implement the loudness effect as Mooly rightly pointed out.

All the very best.
Here is a page for someone selling them on eBay
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Old 19th June 2013, 11:46 PM   #7
Enzo is offline Enzo  United States
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Sounds like your shaft is bound up in the bushing. Some heat might loosen it enough to turn, and just oozing some fresh lube into the bushing will probably free it up with a little effort. Even some WD40 would probably soften the old hardened lube.

And on many older stiff pots, just spraying my Deoxit into them to clean also thins out the lube and frees the motion.
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Old 20th June 2013, 06:33 AM   #8
Mooly is offline Mooly  United Kingdom
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Some good advice for you in the above posts. A drop of lube on the shaft bearing has to be the first step.
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Old 20th June 2013, 08:12 PM   #9
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Rat Shack now sells stereo volume controls with a loudness tap. I believe the value is 100K. It looks like it's the same one they sold decades ago.
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