Adcom parts needed (GFP-1A & GFT-1A)

Tim Schwartz

unread,

Apr 18, 2013, 4:56:15 PM4/18/13

to

Hello all,

I've got 2 vintage Adcom repairs here that I need parts for. Anyone
got any parts units around?

One is a GFP-1A preamp that has a mangled input selector switch S4.
The Adcom part number is PE-90386-02. It will NOT interchange with the
record selector switch. Th original was mangled by a really bad attempt
to clean it, and the contacts are bent and broken on one of the 2 wafers.

The other is a GFT-1A. While I've got the service manual, it does not
include the schematic. I've got a GFT-1 schematic, but it is quite
different than the "A" version. This unit has a bad detector
transformer T102. Sorry, no part number, as its not mentioned in the
manual.

Many thanks!,
Tim
Bristol Electronics
t...@bristolnj.com

chuck

unread,

Apr 19, 2013, 9:57:19 AM4/19/13

to

On Thu, 18 Apr 2013 16:56:15 -0400, Tim Schwartz <t...@bristolnj.com>
wrote:

Tim,

Is Adcom gone or are they not supplying parts for their older models?
Thanks. Chuck

Tim Schwartz

unread,

Apr 19, 2013, 8:02:47 PM4/19/13

to

Chuck,

I did contact the parts vendor Adcom mentions on their website,
Affiliated Electronics in New Jersey. While I have no idea how
extensive their parts inventory is, these units are 20+ years old, and
they don't have them. Its why I was hoping another shop might have one
in their junk heap.

Adcom is still around, or at least they have a web site, but I don't
know any local dealers that carry them.

Regards,
Tim

chuck

unread,

Apr 22, 2013, 11:04:23 AM4/22/13

to

On Fri, 19 Apr 2013 20:02:47 -0400, Tim Schwartz <t...@bristolnj.com>

Thanks Tim. I still rarely get some old Adcom pieces to work on and
it is nice to know that Affiliated is still around.

amdx

unread,

Apr 22, 2013, 12:03:02 PM4/22/13

to

Hi Guys,
Just wanted to piggyback a question about my GTP 500. It is the FM/AM
preamp.
It's been 10 years since I looked into it, but my GTP 500 has a
problem with the FM, no longer recall the symptoms. I was in electronic
repair I know some products have a common problem. Is there an issue
with the FM that crops up on this item? Such as C12 goes open/short?
Mikek

chuck

unread,

Apr 23, 2013, 9:35:09 AM4/23/13

to

I don't remember the number but bad trimmer caps were a problem in
these tuners. Chuck

Tim Schwartz

unread,

Apr 24, 2013, 8:06:51 AM4/24/13

to

> Hi Guys,
> Just wanted to piggyback a question about my GTP 500. It is the FM/AM
> preamp.
> It's been 10 years since I looked into it, but my GTP 500 has a
> problem with the FM, no longer recall the symptoms. I was in electronic
> repair I know some products have a common problem. Is there an issue
> with the FM that crops up on this item? Such as C12 goes open/short?
> Mikek
>

Mikek,

The trimmer caps in the front end of the tuner are a common problem
with these units. Replacing them requires a realignment, as you are
replacing the things that you adjust to align the tuner.

I would also not be surprised to see the memory backup capacitors
failing by now.

Regards,
Tim Schwartz

P.S. You are usually better off starting a new thread with a new
header, as people who know your model will reply when they see it in the
subject line.