Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Adcom GFP-565 IC Part Numbers???
Adcom GFP-565 IC Part Numbers???
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 28th November 2009, 02:16 AM   #1
Zero Cool is offline Zero Cool  United States
diyAudio Member
 
Zero Cool's Avatar
 
Join Date: Sep 2004
Location: MN
Default Adcom GFP-565 IC Part Numbers???

Anyone have a cross reference sheet for Adcom IC's???

I am repairing a GFP-565 pre-amp that has a bad Adcom 7A chip. it is the buffer chip for the record out jacks.



Zc
  Reply With Quote
Old 28th November 2009, 11:51 AM   #2
Bill Fuss is offline Bill Fuss  United States
RIP
 
Join Date: Oct 2005
Location: Central Florida
Look for the article about the 565 in an older AudioXpress. Quite a bit was discussed regarding the opamps. I have it but I recently moved, haven't shown up yet. I'll PM you if they show up soon.
Best, Bill
  Reply With Quote
Old 21st December 2009, 02:19 PM   #3
jackinnj is offline jackinnj  United States
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Adcom GFP-565 IC Part Numbers???
LT1057 -- according to Galo they were used in Class-A and were prone to an internal failure of the positive rail connection. In Galo's article he substituted an AD744KN and and AD811AN gain/buffer a la Jung.
  Reply With Quote
Old 15th January 2010, 04:41 PM   #4
Zero Cool is offline Zero Cool  United States
diyAudio Member
 
Zero Cool's Avatar
 
Join Date: Sep 2004
Location: MN
I dug out my copies of Audio Express and read through them. the Tape output buffers are out in my pre-amp. The main outs are still working (I see he used the AD744KN and and AD811AN combo for the main outs) In the article he replaced the tape buffer LT1057's with AD712's at first retaining the pull down resistor on the output for Class A, and later he replaced those with OPA2604AP's without the class a resistors.

I have some OP275's on hand and im wondering if they would be suitable and if so, should I use the pull down resistors with the 275's???

Last edited by Zero Cool; 15th January 2010 at 04:45 PM.
  Reply With Quote
Old 15th January 2010, 04:58 PM   #5
jackinnj is offline jackinnj  United States
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Adcom GFP-565 IC Part Numbers???
There was an update in 2004 -- I am thinking of using the LME49600 as part of the compound buffer.
  Reply With Quote
Old 15th January 2010, 05:01 PM   #6
Zero Cool is offline Zero Cool  United States
diyAudio Member
 
Zero Cool's Avatar
 
Join Date: Sep 2004
Location: MN
Quote:
Originally Posted by jackinnj View Post
There was an update in 2004 -- I am thinking of using the LME49600 as part of the compound buffer.

Right, but the compound buffer was for for the main outputs, not the tape buffers.

I just need to repair the tape buffers so i can sell the pre-amp. Or are you talking about making a compound buffer setup for the tape outs too?

Zc
  Reply With Quote
Old 15th January 2010, 06:00 PM   #7
jackinnj is offline jackinnj  United States
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Adcom GFP-565 IC Part Numbers???
No, just replacing the existing Main Out.

I appreciate what Gary was trying to do, but a pre is still a pre and I like the ability to drive phones, tone controls. I don't think you need "contour", however.
  Reply With Quote

Reply


Adcom GFP-565 IC Part Numbers???Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Kenwood kac-x201 (part numbers) SomeDude Car Audio 9 20th October 2007 12:17 AM
Can I get a few part numbers for Pots? Destroyer OS Parts 5 19th January 2006 08:20 AM
transistor part numbers bjr Parts 2 4th September 2005 04:26 PM
SMD part numbers? nuppe Parts 0 15th December 2004 10:04 PM
help needed to confirm part numbers chipco3434 Chip Amps 6 15th August 2004 12:05 PM


New To Site? Need Help?

All times are GMT. The time now is 09:47 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki