Adcom GFA-535... Pics... is THIS Stock??

777funk · 11th May 2009, 08:15 PM

I just received a great Adcom 535 Power Amp as a gift. A friend bought it on ebay and had it sent to my door. Very cool gift and great friend.

Anyways, I'm wondering if this is stock. It looks like it's had a couple of caps added. I have no idea if they were original or a Mod of some sort. Curious on thoughts. This is one of my first Hi Fi amplifiers.
thanks!!
Nick

<br>

NOTE: the red Poly cap soldered in the same hole as the resistor at the edge of the board.

777funk · 11th May 2009, 10:23 PM

does anyone by chance have a schematic?

Magura · 11th May 2009, 10:33 PM

I don't have a schematic, but I've seen the innards of a few Adcom pre and power amps.

Some literally looked like an accident, or at least a prototype. So those two caps that seems like they've been put as a modification, could very well be from the factory.

Magura

Nelson Pass · 11th May 2009, 11:07 PM

Don't look at me, I have no idea. I suggest that you contact Adcom for
a copy of the service manual.

777funk · 11th May 2009, 11:09 PM

Quote:

Originally posted by Nelson Pass
Don't look at me, I have no idea. I suggest that you contact Adcom for
a copy of the service manual.

LOL! Did you design this one?

btw... if this is not supposed to be in this forum, I apologize. I'm totally cool with it being moved if it needs to be. I noticed other Adcom information posted here so figured this is where the fans of the 80's Adcom stuff would be.

Nelson Pass · 12th May 2009, 03:23 PM

Designing for Adcom consisted of creating an original piece with
documentation. From that they made production pieces with their
own artwork and such. They did have a good technical staff, so the
products tended to mutate over time, and some new products were
created by simply scaling down a larger piece.

MashBill · 13th May 2009, 02:03 AM

My 535 does not have those caps.

Send me your email and I will send you a PDF of the service manual.

Bill

llwhtt · 13th May 2009, 03:31 AM

If you look at schematic for the 555 you'll see two electrolytics, a large one in the F/B circuit and a smaller one in the bias circuit. The large one is bypassed by a .1uf film capacitor. Now look at the picture of the 535 board, if you check out the components around the large electrolytic all of the values are the same as the 555 and appears the film capacitor was added as the bypass after the board was made. Also there are many empty part locations, less outputs and associated components, probably the same board. Anyway that's WHAT it is, how,who, when, and why are still the questions. I wonder if the original 555 had the bypass?

Craig

llwhtt · 13th May 2009, 02:00 PM

That should be a 1uf film capacitor NOT .1uf in my last post.

Craig

adason · 13th May 2009, 08:03 PM

wow, I just noticed the fuses on that thing!!!!!
if that thing blows, it takes everything with it
I would replace those fuses with correct ones if I were you

11th May 2009, 08:15 PM	#1
777funk diyAudio Member Join Date: Feb 2007 Location: MO	Adcom GFA-535... Pics... is THIS Stock?? I just received a great Adcom 535 Power Amp as a gift. A friend bought it on ebay and had it sent to my door. Very cool gift and great friend. Anyways, I'm wondering if this is stock. It looks like it's had a couple of caps added. I have no idea if they were original or a Mod of some sort. Curious on thoughts. This is one of my first Hi Fi amplifiers. thanks!! Nick <br> <br> NOTE: the red Poly cap soldered in the same hole as the resistor at the edge of the board. __________________ Nick

11th May 2009, 10:23 PM	#2
777funk diyAudio Member Join Date: Feb 2007 Location: MO	does anyone by chance have a schematic? __________________ Nick

11th May 2009, 10:33 PM	#3
Magura diyAudio Member Join Date: Oct 2003 Location: Denmark, Viborg	I don't have a schematic, but I've seen the innards of a few Adcom pre and power amps. Some literally looked like an accident, or at least a prototype. So those two caps that seems like they've been put as a modification, could very well be from the factory. Magura __________________ Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com

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11th May 2009, 11:07 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	Don't look at me, I have no idea. I suggest that you contact Adcom for a copy of the service manual.

12th May 2009, 03:23 PM	#6
Nelson Pass The one and only Join Date: Mar 2001	Designing for Adcom consisted of creating an original piece with documentation. From that they made production pieces with their own artwork and such. They did have a good technical staff, so the products tended to mutate over time, and some new products were created by simply scaling down a larger piece.

13th May 2009, 02:03 AM	#7
MashBill diyAudio Member Join Date: Jun 2004 Location: Kansas, USA	My 535 does not have those caps. Send me your email and I will send you a PDF of the service manual. Bill

13th May 2009, 03:31 AM	#8
llwhtt diyAudio Member Join Date: Jun 2008	If you look at schematic for the 555 you'll see two electrolytics, a large one in the F/B circuit and a smaller one in the bias circuit. The large one is bypassed by a .1uf film capacitor. Now look at the picture of the 535 board, if you check out the components around the large electrolytic all of the values are the same as the 555 and appears the film capacitor was added as the bypass after the board was made. Also there are many empty part locations, less outputs and associated components, probably the same board. Anyway that's WHAT it is, how,who, when, and why are still the questions. I wonder if the original 555 had the bypass? Craig

13th May 2009, 02:00 PM	#9
llwhtt diyAudio Member Join Date: Jun 2008	That should be a 1uf film capacitor NOT .1uf in my last post. Craig

13th May 2009, 08:03 PM	#10
adason diyAudio Member Join Date: Nov 2004 Location: troll in US	wow, I just noticed the fuses on that thing!!!!! if that thing blows, it takes everything with it I would replace those fuses with correct ones if I were you

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