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adcom

  1. C Hart

    Emotiva vs. Adcom Preamp Tuner

    Looking for some advice from the experts here. I ordered a new pair of very nice powered monitors. Among other things they eliminate the need for an amp, so the preamp will be basically the entire guts of the system. I have an Adcom GTP-500 which I love but it recently lost a channel, so I got...
  2. MiguelSarmi

    What to get?

    Hello everyone. Hope you are all alright. I need help choosing the following units I found for sale but cannot audition them as they’re all a while away from me. The choices I have will be paired with either a Boston Acoustics HD5 or Celestion 1 (no passive subwoofer) speakers. My studio...
  3. BilboBaggins

    Helping out a friend with his audio gear

    I'm not sure how this thread will evolve, if it even does evolve. But this is too interesting not to document it. I reconnected with a college friend back in January on some emergency services work he did for me. As a result, we have gotten together a few times since then. At a pub playing...
  4. klamsoss

    Adcom GTP-500 II problems

    I've been away from the repair bench for a while but I'm finally back at it, clearing out some pieces I have neglected for a long time. First up is the adcom preamp mentioned above. I have the service manual, but before I dig in too deep, I figured I'd stop here and see if anyone has experience...
  5. Chris Newman

    Adcom GCD-750 cd tray won't open

    Hi everyone, Just got a cheap Adcom GCD-750 because the tray doesn't open. I'm going to take it apart and have a look, but being pretty novice to the world of hifi repairs does anyone have any advice? From what i read, this could be due to a worn or broken cd tray belt. I've looked online to...
  6. KingWzrd

    Hafler DH500 Channel Out Help Needed

    Hello everyone, I have a DH-500 that recently had the right channel stop putting out sound. I've read a few posts about ensuring the relay clicks when the amp it switched on (it does) and all fuses inside and the back are not blown. The light is normal on the front of the unit and the fan is...
    • KingWzrd
    • Thread
    • adcom amplifier diagnosing diagnostics gfa-555 hafler
    • Replies: 5
    • Forum: Solid State
  7. A

    Thermal Pad Recommendations

    Greetings. I am refurbishing an old Adcom GFA-535II amplifier. I am replacing the power supply board with a Hoppe's Brain kit and am now working on the two main boards which each have several transistors that are screwed into heat sinks. I already disconnected to get the boards out and now...
  8. E

    ADCOM GTP 500 II - Negative DC voltage on RCA inputs

    Hi Everyone, This is my first post. I'm measuring negative DC voltage on the RCA source inputs. It moves to different sources as the source selection changes. Anywhere from -2.5 to -13 volts DC. It does not appear on the phono inputs though. I can listen to the phono input through the...
    • Erin Brigham
    • Thread
    • adcom gtp 500 ii negative dc voltage
    • Replies: 2
    • Forum: DIY
  9. psychoanima

    Crackling noise on ADCOM gcd 575

    Hello everyone! I bought this old cd player because I heard great stories about 1541 dac, and this player in general. Anyhow, playing some discs I noticed some random noises in the music, and they are getting more common from mid to the end of disc. These random noses are really hard to...
  10. S

    Adcom GFA5800 Power Switch LED is out

    Power LED on Adcom GFA5800 is out. How to replace, what part, etc. Thanks a million to anyone who can help!!
    • SeattAl
    • Thread
    • adcom adcom 5800 led power amp repair switch
    • Replies: 0
    • Forum: DIY
  11. raymondjiii

    Repair of Adcom GTP 500 II volume pot and motor

    I have been working on a repair of this unit. It looks like the unit was dropped on it's face. I was able to repair the on/off button internals, I am going to put some jumpers on the little FM Scan board that cracked in half (only has the two buttons attached to it, plus small ribbon.) The last...
  12. H

    Hello from BC

    I recently inherited a pair of KEF Reference Series 107s (and an Adcom GFA-555). Aside from the sentimental value they hold, I understand the R107s are quite special speakers. I know next to nothing about Hifi, but am thinking I could get into it. Hoping to get some useful information on this...
  13. Racingh11

    Adcom GFA-565 service

    I finished restoring a pair of these amps. They both had DC offset issues among other things. After messing around with the original board on the first one, I found it had current leaking into the DC servo opamp ground reference. I removed everything from the trace and it was still there around...
    • Racingh11
    • Thread
    • adcom driver board gfa-565 gfa565 power amp
    • Replies: 11
    • Forum: Solid State
  14. Will2225

    Help with Adcom GFA 555

    About a month back I recapped the small board on this amp and everything worked perfectly. Today I tried changing out the filter caps with 18,000 100volt caps. I powered it on with a 150 watt bulb in my dim bulb tester. The bulb lights brightly then dims and then starts to get brighter and...
  15. S

    What to do with my Adcom amp?

    Hey all, Last year purchased a pair of B&W 706 S2s (https://www.bowerswilkins.com/home-audio/706-s2). At the time of purchase I knew I was breaking the budget, but fortunately my dad had an amp/preamp lying around which could hold me over. The speakers are currently being powered by an Adcom GTP...
  16. 44100_Hz

    ADCOM GCD-575 Issue

    Hi All! I've recently acquired an ADCOM GCD-575 single-disc CD player. When I received it, it was working as expected. However, I'm now encountering an issue where the only output from all analog outputs (line, variable, headphone) is a low hum and variable interference that sounds almost like...
  17. waryan

    AdCom GTP-500 Tuner Issue

    Hi folks - I have an issue with the tuner in an Adcom GTP-500 from 1986. I searched the forum here and found some fantastic posts that helped me to replace CT104 (failed trimmer cap), though that only uncovered a different issue. I am able to scan and tune the expected stations with the repair...
  18. ChrisPDX

    Evaluating Adcom GFA-2535 : DC offset question

    I recently acquired a used Adcom GFA-2535, which is two GFA-535 amps (MKII version, if I understand correctly) in one unit. These amps can be run independently in “stereo” mode or in “bridged” mode. This unit does not have input-level control dials. I wanted to check the amps' DC offsets before...
  19. mtb_ww

    Adcom GTP-502/506 (Help needed)

    I have an Adcom GTP-502 that is still in daily use. However, the remote is DOA. I am having difficulty finding a replacement remote or remote codes for a universal remote. Any suggestions? Thanks in advance and greetings from NC. (PS: I believe the GTP-506 used the same remote too.)
    • mtb_ww
    • Thread
    • adcom code gtp-502 gtp-506 remote
    • Replies: 1
    • Forum: Solid State
  20. runnin'

    Brand New Adcom Amp - In the house!

    I thought I'd share this in the New Gear Values because it's a pretty great bang for buck amp. The GFA 565SE: 250 wpc, 350 into 4 ohms Frequency Range -3 db is 5 hz to 100kHz Damping factor 800 THD is under .009% I’ve got about 80 hours on the big Adcom now. I’ve used Tannoy DC4T, Infinity...
  21. D Beeby

    Adcom GTP-400 and GFA-535 II - loud popping / shrieking when touched

    Hello folks, This is my first post, so thanks in advance for your advice for a newbie... I have (what-I-want-to-be) a nice Adcom setup, but it's really behaving badly. I thought it might be a bad interconnect, so I changed them all. When I touch or tap the top of the GTP-400 (literally, if I...
  22. Frbock

    Debating 3 options two of which I already own

    I have an Onkyo tx-8555 receiver that was muddy when I tried to replace my Yamaha a-32 (140wpc/ 8 more at 4). So, I went for plan B. I have an Adcom GTP-400 driving an Onkyo M-5010(75/8 but only 65/4). It sounds very clear. I sent the Tx-8555 out for a re-bias, should punch it up to good as new...
  23. efrance45

    Adcom GFA 5500 - good buy?

    Hi all - I’ve been looking for a power amp upgrade for my ELAC B6s for a stereo listening setup and have come across and Adcom GFA 5500 for $150. I don’t have pictures yet but the seller says it works well, just a couple front panel bulbs burned out. Is this a good deal? He’s selling other...
  24. scavenger

    Heathkit AA-1640 Vs. Adcom gfa-555

    I have the adcom. Was thinking about doing some buy and sell to switch to the Heathkit. The adcom is the original Mk I, not Mk II. It's in great shape. Not a scratch. Runs great. Haven't heard the Heathkit yet. It's hooked to some Bose 901's and is fed with a Heathkit AP-1615 preamp for...
  25. M

    Mirage M3si’s - amp discussion 2020

    Hi everyone, New member here. I’m currently in the process of putting together my first audiophile stereo system. My father had a set of m5si’s in college and loved them - I did some research and just picked up a pair of used Mirage M3si’s. From what I’ve read they should sound great with all...
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