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  1. #1

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    Default Fixing an Adcom GFA 555

    Hi all,

    I just got a used Adcom GFA 555, it looks different to all the 555's I've seen, so I think it's kind of old.

    The amp was cheap because the right channel RCA Jack is broken. I thought it was going to be an easy and cheap fix, but the two (2) RCA inputs are in one plastic unit. I need help finding a new RCA jack "thingy". At least the amp powers up and seems to work.

    Below are pictures of the amp opened up and the RCA jack plastic unit/thingy

    It looks clean, the caps are not swollen or leaking everything looks great.





    The broken Right Channel RCA Jack


    The back of the RCA jacks


    The plastic RCA jack unit


    This is where the RCA's are soldered to the board




    Last edited by pablo_rodz; 07-11-2009 at 03:15 PM.
    HT:
    Projector - JVC HD100, 100" Fixed Screen, A/V Receiver - Pioneer Elite VSX-92TXH, Power Conditioner - Panamax M5300-EX, BluRay - Sony PS3 Looking for a gently used Oppo BD95, Speakers - RTiA9's, CSiA6, FXi A4, Sub - 12" M&K VX-1250

    Living Room:
    TV - Kuro Elite PRO-111FD, Fronts.Rti10's (not connected yet), Media source, Logitech Revue

    *Need to fix a used ADCOM GFA-555. Do you know where to have it services in Texas (Houston Area)?

  2. #2

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  3. #3

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    Default

    Don't most older GFA-555s just have TWO large Blue 30kmfs CAPS not four? So are those new mods to that unit?

    cnh

  4. #4

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    Default

    Quote Originally Posted by jvc View Post
    I did check PE, but the RCA jacks they have are for chassis mount, I need the plastic RCA pad (L+R in one). If I cannot find it I'll have to rig-up something
    HT:
    Projector - JVC HD100, 100" Fixed Screen, A/V Receiver - Pioneer Elite VSX-92TXH, Power Conditioner - Panamax M5300-EX, BluRay - Sony PS3 Looking for a gently used Oppo BD95, Speakers - RTiA9's, CSiA6, FXi A4, Sub - 12" M&K VX-1250

    Living Room:
    TV - Kuro Elite PRO-111FD, Fronts.Rti10's (not connected yet), Media source, Logitech Revue

    *Need to fix a used ADCOM GFA-555. Do you know where to have it services in Texas (Houston Area)?

  5. #5

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    Default

    Quote Originally Posted by cnh View Post
    Don't most older GFA-555s just have TWO large Blue 30kmfs CAPS not four? So are those new mods to that unit?

    cnh
    I have no Idea, the guy that sold it to me had no info. on it, he even asked what I wanted it for , that he had no idea why will some one need one...
    HT:
    Projector - JVC HD100, 100" Fixed Screen, A/V Receiver - Pioneer Elite VSX-92TXH, Power Conditioner - Panamax M5300-EX, BluRay - Sony PS3 Looking for a gently used Oppo BD95, Speakers - RTiA9's, CSiA6, FXi A4, Sub - 12" M&K VX-1250

    Living Room:
    TV - Kuro Elite PRO-111FD, Fronts.Rti10's (not connected yet), Media source, Logitech Revue

    *Need to fix a used ADCOM GFA-555. Do you know where to have it services in Texas (Houston Area)?

  6. #6

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    Default

    I may have been wrong about those caps....perhaps it is 4 X 15K. And 16 small caps.

    See this link for a photo to compare with yours.

    http://www.polkaudio.com/forums/atta...5&d=1148038682

    cnh

  7. #7

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    Default

    Quote Originally Posted by cnh View Post
    I may have been wrong about those caps....perhaps it is 4 X 15K. And 16 small caps.

    See this link for a photo to compare with yours.

    http://www.polkaudio.com/forums/atta...5&d=1148038682

    cnh

    that is correct it has (Capacitor Technologies) 4 x 15000 MFD 80 WVDC
    and 16 Toshiba small caps.

    Does someone knows what does this mean on the Toroidal Transformer 01124 708 VA 11 85 ???
    HT:
    Projector - JVC HD100, 100" Fixed Screen, A/V Receiver - Pioneer Elite VSX-92TXH, Power Conditioner - Panamax M5300-EX, BluRay - Sony PS3 Looking for a gently used Oppo BD95, Speakers - RTiA9's, CSiA6, FXi A4, Sub - 12" M&K VX-1250

    Living Room:
    TV - Kuro Elite PRO-111FD, Fronts.Rti10's (not connected yet), Media source, Logitech Revue

    *Need to fix a used ADCOM GFA-555. Do you know where to have it services in Texas (Houston Area)?

  8. #8

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    Default

    Anyone??
    Does anyone know where I can find a dual RCA jack?
    HT:
    Projector - JVC HD100, 100" Fixed Screen, A/V Receiver - Pioneer Elite VSX-92TXH, Power Conditioner - Panamax M5300-EX, BluRay - Sony PS3 Looking for a gently used Oppo BD95, Speakers - RTiA9's, CSiA6, FXi A4, Sub - 12" M&K VX-1250

    Living Room:
    TV - Kuro Elite PRO-111FD, Fronts.Rti10's (not connected yet), Media source, Logitech Revue

    *Need to fix a used ADCOM GFA-555. Do you know where to have it services in Texas (Houston Area)?

  9. #9

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    Default

    you might try and contact this guy...

    http://www.alibaba.com/product-gs/50.../RCA_Jack.html

    or better yet save up some cash and send it to these guys...

    http://www.musicaldesign.com/adcom.htm

    or at least call them and see if you can source that part somewhere...

    David
    I like to listen, tinker, listen and repeat.

  10. #10

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    Default

    Pedro....try:

    www.jameco.com

    they're very likely to have it...u may have to do extensive searching or call them tho.

    Good luck....at worst you can rig one im sure.
    Cool stuff: Adcom GFA-555, GFP-710, Oppo BDP-83, Monitor 10's w/RDO198s...rebuilt and modded XO Sonicaps topside..Daytons Low.
    Benq W5000

    "Screw getting close....feels like heaven to me....fluffy polk clouds all around......"

  11. #11

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    Default

    Quote Originally Posted by Bigbang View Post
    you might try and contact this guy...

    http://www.alibaba.com/product-gs/50.../RCA_Jack.html

    or better yet save up some cash and send it to these guys...

    http://www.musicaldesign.com/adcom.htm

    or at least call them and see if you can source that part somewhere...

    David
    Yikes that would be quite a bit of cash:(

    I wonder If I could do some of that myself
    HT:
    Projector - JVC HD100, 100" Fixed Screen, A/V Receiver - Pioneer Elite VSX-92TXH, Power Conditioner - Panamax M5300-EX, BluRay - Sony PS3 Looking for a gently used Oppo BD95, Speakers - RTiA9's, CSiA6, FXi A4, Sub - 12" M&K VX-1250

    Living Room:
    TV - Kuro Elite PRO-111FD, Fronts.Rti10's (not connected yet), Media source, Logitech Revue

    *Need to fix a used ADCOM GFA-555. Do you know where to have it services in Texas (Houston Area)?

  12. #12

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    Default

    Quote Originally Posted by pablo_rodz View Post
    Yikes that would be quite a bit of cash:(

    I wonder If I could do some of that myself

    I'm sure ben could do it

    maybe you should PM him
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  13. #13

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    Default

    +1. I'm sure Dr. Polkenstein can hook you up.
    I refuse to argue with idiots, because people can't tell the DIFFERENCE!

  14. #14

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    Default

    So Ben or Dr. Polkestein are the guys to find??

    But I would like to learn how to do it....
    HT:
    Projector - JVC HD100, 100" Fixed Screen, A/V Receiver - Pioneer Elite VSX-92TXH, Power Conditioner - Panamax M5300-EX, BluRay - Sony PS3 Looking for a gently used Oppo BD95, Speakers - RTiA9's, CSiA6, FXi A4, Sub - 12" M&K VX-1250

    Living Room:
    TV - Kuro Elite PRO-111FD, Fronts.Rti10's (not connected yet), Media source, Logitech Revue

    *Need to fix a used ADCOM GFA-555. Do you know where to have it services in Texas (Houston Area)?

  15. #15

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    Default Hummm/ Buzz on left channel

    Hi all!

    I just ordered a pair of gold plated RCA Jacks to fix the amp. I couldn't hold my self and decided to hook-up my new Atrium 45 to the amp to see if it works....

    Well the right channel works, music plays fine, but the left channel has a Humm/ buzzing sound. The humm is even present when I remove the Interconnect (cable).

    Does anyone have an idea of what could be causing it?
    HT:
    Projector - JVC HD100, 100" Fixed Screen, A/V Receiver - Pioneer Elite VSX-92TXH, Power Conditioner - Panamax M5300-EX, BluRay - Sony PS3 Looking for a gently used Oppo BD95, Speakers - RTiA9's, CSiA6, FXi A4, Sub - 12" M&K VX-1250

    Living Room:
    TV - Kuro Elite PRO-111FD, Fronts.Rti10's (not connected yet), Media source, Logitech Revue

    *Need to fix a used ADCOM GFA-555. Do you know where to have it services in Texas (Houston Area)?

  16. #16

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    Default Here is he?

    Quote Originally Posted by obieone View Post
    +1. I'm sure Dr. Polkenstein can hook you up.
    I tried searching by his name but I got no results...
    HT:
    Projector - JVC HD100, 100" Fixed Screen, A/V Receiver - Pioneer Elite VSX-92TXH, Power Conditioner - Panamax M5300-EX, BluRay - Sony PS3 Looking for a gently used Oppo BD95, Speakers - RTiA9's, CSiA6, FXi A4, Sub - 12" M&K VX-1250

    Living Room:
    TV - Kuro Elite PRO-111FD, Fronts.Rti10's (not connected yet), Media source, Logitech Revue

    *Need to fix a used ADCOM GFA-555. Do you know where to have it services in Texas (Houston Area)?

  17. #17
    GV#27
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    Default

    Quote Originally Posted by pablo_rodz View Post

    Does someone knows what does this mean on the Toroidal Transformer 01124 708 VA 11 85 ???
    Probably part#,VA rating (708)and date code.

  18. #18
    GV#27
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    Default

    Quote Originally Posted by pablo_rodz View Post

    Does anyone have an idea of what could be causing it?
    Possibly a bad filter cap.Also did you make sure to isolate the body of the new RCA connectors from the chassis.

  19. #19

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    Coupling capacitor maybe or you still have a open signal or cracked ground on that jack? Since you have obvious external damage, I'd focus on that first.

    Coupling caps COULD be something like those round yellow caps that I think I see four of in one of those pictures. Somebody with experience on that amp might be able to send you right to the correct parts in there. Just know what your doing before you poke around in there...those big caps mean business and may hold a charge long after it's off!!

    CoolJazz

  20. #20

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    I'm sure this is who Lasareath is referring to...

    http://www.polkaudio.com/forums/member.php?u=76154

    Ben knows about Adcoms, in fact he's who I bought mine from (GFA555).

    He's also a pretty good guy, but that's just IMHO ;)

  21. #21

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    Ben is great at exactly this kind of thing among a whole host of others. And offers to help anyone out there who needs it. He knows his stuff.

    When I first got my Adcom, he told me to drop it by and he'd take a look at my caps, etc, if I were down his way. I have a friend in Atlanta and occasionally get down there. I will certainly lug the Adcom down on my next trip.

    Drop Ben a line and get an estimate...and check out your shipping options.

    cnh
    Last edited by cnh; 07-18-2009 at 06:23 PM.

  22. #22

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    I don't believe those had coupling caps
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  23. #23

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    I PM'd Ben....

    Thanks...

    Also, I haven't replaced the RCA jacks, I just ordered them today. How do I discharge the caps, before shocking myself???

    Thanks again!
    HT:
    Projector - JVC HD100, 100" Fixed Screen, A/V Receiver - Pioneer Elite VSX-92TXH, Power Conditioner - Panamax M5300-EX, BluRay - Sony PS3 Looking for a gently used Oppo BD95, Speakers - RTiA9's, CSiA6, FXi A4, Sub - 12" M&K VX-1250

    Living Room:
    TV - Kuro Elite PRO-111FD, Fronts.Rti10's (not connected yet), Media source, Logitech Revue

    *Need to fix a used ADCOM GFA-555. Do you know where to have it services in Texas (Houston Area)?

  24. #24
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    Quote Originally Posted by dudeinaroom View Post
    I don't believe those had coupling caps
    I believe the original version did but the MK11 version omitted them in favour of a servo.
    Quote Originally Posted by pablo_rodz View Post
    How do I discharge the caps, before shocking myself???

    Thanks again!
    With a >50 ohm 2watt resistor.
    Last edited by GV#27; 07-18-2009 at 07:27 PM.

  25. #25

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    where did u find the part btw?? should this ever so sucky situation arrive....I'd want to know.......
    Cool stuff: Adcom GFA-555, GFP-710, Oppo BDP-83, Monitor 10's w/RDO198s...rebuilt and modded XO Sonicaps topside..Daytons Low.
    Benq W5000

    "Screw getting close....feels like heaven to me....fluffy polk clouds all around......"

  26. #26

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    Quote Originally Posted by RandyWilliamson View Post
    where did u find the part btw?? should this ever so sucky situation arrive....I'd want to know.......
    I havent found the part, I'm going to try to "rig-it up".
    HT:
    Projector - JVC HD100, 100" Fixed Screen, A/V Receiver - Pioneer Elite VSX-92TXH, Power Conditioner - Panamax M5300-EX, BluRay - Sony PS3 Looking for a gently used Oppo BD95, Speakers - RTiA9's, CSiA6, FXi A4, Sub - 12" M&K VX-1250

    Living Room:
    TV - Kuro Elite PRO-111FD, Fronts.Rti10's (not connected yet), Media source, Logitech Revue

    *Need to fix a used ADCOM GFA-555. Do you know where to have it services in Texas (Houston Area)?

  27. #27

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    Well I got the RCA Jacks, and solder iron today.... Can't wait for the weekend to "fix" the amp.
    HT:
    Projector - JVC HD100, 100" Fixed Screen, A/V Receiver - Pioneer Elite VSX-92TXH, Power Conditioner - Panamax M5300-EX, BluRay - Sony PS3 Looking for a gently used Oppo BD95, Speakers - RTiA9's, CSiA6, FXi A4, Sub - 12" M&K VX-1250

    Living Room:
    TV - Kuro Elite PRO-111FD, Fronts.Rti10's (not connected yet), Media source, Logitech Revue

    *Need to fix a used ADCOM GFA-555. Do you know where to have it services in Texas (Houston Area)?

  28. #28

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    Default No Luck!

    Quote Originally Posted by pablo_rodz View Post
    Can't wait for the weekend to "fix" the amp.
    Well that didn't work! :(

    The HUMM is still present, and louder.

    I tried PMing Ben, but his PM's are maxed out!
    HT:
    Projector - JVC HD100, 100" Fixed Screen, A/V Receiver - Pioneer Elite VSX-92TXH, Power Conditioner - Panamax M5300-EX, BluRay - Sony PS3 Looking for a gently used Oppo BD95, Speakers - RTiA9's, CSiA6, FXi A4, Sub - 12" M&K VX-1250

    Living Room:
    TV - Kuro Elite PRO-111FD, Fronts.Rti10's (not connected yet), Media source, Logitech Revue

    *Need to fix a used ADCOM GFA-555. Do you know where to have it services in Texas (Houston Area)?

  29. #29

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    Not to jack this thread,, but WHERE IS BEN???...Anyone Know?Im a little worried as I havent seen any posts lately and thats not like him.
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  30. #30
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    Quote Originally Posted by fbm211 View Post
    Not to jack this thread,, but WHERE IS BEN???...Anyone Know?Im a little worried as I havent seen any posts lately and thats not like him.
    Ben is in Conneticut visiting his mom.

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