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
😎
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
😎
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.
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.
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
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
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
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
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
If you get the original, it fits the board and the knob will fit too!
-Chris
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
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
Re: adcom part not available
http://www.diyaudio.com/forums/showthread.php?s=&threadid=31628
😉
rj45 said:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=31628
😉
GTP 400 SERVICE MANUAL
I know its been many years, but do you still have the service manual for the GTP-400 ? ADCOM wants $20, and I'm not willing to pay them.
Thanks
-RJ
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!
I know its been many years, but do you still have the service manual for the GTP-400 ? ADCOM wants $20, and I'm not willing to pay them.
Thanks
-RJ
Loudness tap?
FWIW -- i'd take Nelson's advice and build an attenuator with R0805 resistors-- could easily fit in the same space.
Yes, loudness tap.
Hi RJ,
What's the problem with paying them $20 for a manual?? Service manuals are extremely expensive from many distributors - if they will sell it to you. Many sources on the net also want $20 for a manual.
I don't think you're being reasonable, especially with how much time the manual will save you! You should see what we had to deal with before the internet existed!
Your choice man.
-Chris
Hi RJ,
What's the problem with paying them $20 for a manual?? Service manuals are extremely expensive from many distributors - if they will sell it to you. Many sources on the net also want $20 for a manual.
I don't think you're being reasonable, especially with how much time the manual will save you! You should see what we had to deal with before the internet existed!
Your choice man.
-Chris
What Nelson said, it was an Alps pot just not their better ones like found in the GFP-565. You might want to contact Rotel and send them picture, they might have one just like it.
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