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Old 23rd May 2006, 07:44 PM   #1
rj45 is offline rj45  United States
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Question adcom preamp pot?

Hi all,

I'm the proud owner of an Adcom GTP-400 preamp-tuner with
a funky volume control pot. I've removed it, but hours of paging through Mouser, Jameco, etc web sites has proven frustrating.

I'd like to get a "drop in" replacement. I know ALPS is much better,
but I don't want to deal with making it fit.

The Adcom part is labeled:
V50KBX2 4TR-2586

Does anyone know where I can find a replacement?

Thanks,
RJ
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Old 23rd May 2006, 07:58 PM   #2
Nisbeth is offline Nisbeth  Denmark
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Got any pictures of the original pot?


/U.
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Old 23rd May 2006, 08:35 PM   #3
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I thought it was an Alps. If you can't easily get one, try
a 24 position selector switch (make before break) wired with
resistors - they're a pain to make, but very worthwhile for
performance and longevity. I like the Elma and Grayhill switches
the best.
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Old 24th May 2006, 04:04 PM   #4
anatech is offline anatech  Canada
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Hi RJ,
Is the control noisy, or does it cut out?

If it's noisy, check for DC voltage across it. If you need a new one, contact Adcom, or a warranty center near you.

-Chris
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Old 24th May 2006, 05:50 PM   #5
rj45 is offline rj45  United States
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Cool adcom preamp pot specifics

Good questions!

no pic (yet)

dual-gang.
4 solder pins on the bottom.
panel mount, long (1.25") shaft.

Pot cuts out left channel at < 50% volume,
some scratchiness above that level, occassionally
distortion.

Tried massive amounts of TFE on the control.
Helped a little, but not nearly enough.

AFAICT, it's a cheap carbon comp wipe, maybe
plastic, don't know.

-RJ
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Old 24th May 2006, 06:00 PM   #6
anatech is offline anatech  Canada
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You can install a better control (switched resistor or conductive plastic), or you can get another original type.

If you get the original, it fits the board and the knob will fit too!

-Chris
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Old 24th May 2006, 06:52 PM   #7
Nisbeth is offline Nisbeth  Denmark
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How big is it? The black Noble has 4 pins on it?


/U.
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Old 25th May 2006, 03:01 PM   #8
rj45 is offline rj45  United States
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Talking adcom preamp pot pic

Here's a pic of the pot
Attached Images
File Type: jpg adcom-pot-best-compress.jpg (31.3 KB, 229 views)
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Old 25th May 2006, 03:04 PM   #9
anatech is offline anatech  Canada
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Have you called Adcom?
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Old 2nd June 2006, 03:22 PM   #10
rj45 is offline rj45  United States
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Angry adcom part not available

Well, I broke down and called Adcom - I was not happy about the $25 minimum order (for a $3 pot), but figured that I had already exceeded that $$ just in my time searching catalogs and web pages.

No Joy. Adcom cheerfully told the part was not available. Wah!
They DID email a copy of the service manual, but the quality of the scan was so bad, I'll need to trace the circuit just to find out what this puppy is doing with it's 4 connections per channel.

I got a good deal on the preamp - $40 - but it may be wasted $$ if I can't replace the pot successfully.

Thanks for the help!

-RJ
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