Adcom question. Need help

boston1450
boston1450 Posts: 7,639
edited August 2013 in 2 Channel Audio
Hooked up the Adcom today. Sounds wonderful. Playing around with the buttons I noticed when balance knob is in middle both speakers are working & sounds perfect. Turn balance knob to left nothing/no sound at all---Turn it all the way to right & both speakers are both working--vs just the right speaker...Any thoughts besides leave it in the middle. Lol (where both work fine)
also. There is a little button on back by speaker connect that is adjustable. Where should i keep it set at---i did no research on this & thought i would just ask here--- hooked to my SDA's only. TIA randy
..
Post edited by boston1450 on
· Share on FacebookShare on Twitter

Comments

  • TNHNDYMAN
    TNHNDYMAN Posts: 2,145
    edited August 2013
    Randy- Could you post a pic of the back? A lot of times there is a output level adjustment on each channel. If that is what it is, I would run it maxed out and control volume with the pre.

    As to the balance ?... could you try gently removing the plastic knob covering the actual shaft and see if you can hand turn the knob all the way left for left and right for right only. Bring it back to the indent indicating center/equal balance and replace knob with indicator pointing straight up. If it still has the same issue, I'd try using some deoxit spray (access the hole on the shaft inside the chassis by removing cover) and working the shaft thru full motion multiple times to see if that clears and oxidation or crud issues on the contact. Other than that I don't have any idea why it would do that. Good luck working it out.
    2-ch System: Parasound P/LD 2000 pre, Parasound HCA-1000 amp, Parasound T/DQ Tuner, Phase Technology PC-100 Tower speakers, Technics SL-1600 Turntable, Denon 2910 SACD/CD player, Peachtree DAC iT and X1asynchorus USB converter, HSU VTF-3 subwoofer.

    · Share on FacebookShare on Twitter
  • ZLTFUL
    ZLTFUL Posts: 5,648
    edited August 2013
    Sounds like there is build-up in the balance pot. A De-Oxit bath should help a bunch. Any scratchiness in the pots otherwise?

    On the amp, the back should look like this:
    htf_imgcache_39217.jpeg

    And looking at the picture of your amp, other than whatever funky stuff is attached to the binding posts, that's exactly how yours looks.
    There shouldn't be any adjustment on the speaker outputs. The only thing on the back of the 555 that can be adjusted is the bridging switch which should be in stereo.

    It actually looks like in your picture, the switch is in the "Bridged" position. If that is the case, then it makes perfect sense as this switch disables the Left input of the amp (right input is only used when bridged). I would check that and make sure the switch is in Stereo...
    "Some people find it easier to be conceited rather than correct."

    "Unwad those panties and have a good time man. We're all here to help each other, no matter how it might appear." DSkip
    · Share on FacebookShare on Twitter
  • boston1450
    boston1450 Posts: 7,639
    edited August 2013
    BINGO. THATS WHAT IT WAS. I thought i put switch on stereo. It perfect now
    one more question. Should i turn amp off first. Or pre ? Thanks a bunch
    ..
    · Share on FacebookShare on Twitter
  • boston1450
    boston1450 Posts: 7,639
    edited August 2013
    Attachment not found.This Adcom is incredible on SDA's :)
    ..
    · Share on FacebookShare on Twitter
  • boston1450
    boston1450 Posts: 7,639
    edited August 2013
    No scratchiness at all. In balance or volume. It was the switch. Huh. Little things matter. I dusted the fins on back n must of hit it. I know for a fact i put it on stereo. I know nothing about bridging.
    ..
    · Share on FacebookShare on Twitter
  • ZLTFUL
    ZLTFUL Posts: 5,648
    edited August 2013
    Your turn on order should be amp last.

    Your turn off order should be amp first.
    Make sure that you let it fully power down too (light turns off).

    Glad you are loving the Adcom. The 555 is a fantastic amp. Nelson Pass design and so good, Adcom has kept it in their lineup even to today.
    "Some people find it easier to be conceited rather than correct."

    "Unwad those panties and have a good time man. We're all here to help each other, no matter how it might appear." DSkip
    · Share on FacebookShare on Twitter
  • boston1450
    boston1450 Posts: 7,639
    edited August 2013
    Thanks. That is a big big help there. I knew there had to be a order in on-off operation. I will learn that THANKS AGAIN
    ..
    · Share on FacebookShare on Twitter
  • ZLTFUL
    ZLTFUL Posts: 5,648
    edited August 2013
    Any time man.
    I noticed right off that the slight power on/power off pop of my NAD 1020 was way amplified with the amp on hehe.
    "Some people find it easier to be conceited rather than correct."

    "Unwad those panties and have a good time man. We're all here to help each other, no matter how it might appear." DSkip
    · Share on FacebookShare on Twitter
  • leftwinger57
    leftwinger57 Posts: 2,917
    edited August 2013
    Isn't that combo great. You have a winner amp great speakers and a resolved pre/amp problem.Good stuff,clearly a fan of Adcom and when my cable issues are resolved I just might look into an Adcom pre to match.
    2chl- Adcom GFA- 555-Onkyo P-3150v pre/amp- JVC-QL-A200 tt- Denon 1940 ci cdp- Adcom GFS-6 -Modded '87 SDA 2Bs - Dynamat Ext.- BH-5- X-Overs VR-3, RDO-194 tweeters, Larry's Rings, Speakon/Neutrik I/C- Cherry stain tops Advent Maestros,Ohm model E

    H/T- Toshiba au40" flat- Yamaha RX- V665 avr- YSD-11 Dock- I-Pod- Klipsch #400HD Speaker set-

    Bdrm- Nikko 6065 receiver- JBL -G-200s--Pioneer 305 headphones--Sony CE375-5 disc
    · Share on FacebookShare on Twitter
  • boston1450
    boston1450 Posts: 7,639
    edited August 2013
    I may add a Adcom tuner down the road, but for now all i have to say is ive been missing out..these amps are very nice clean sound. I was worried i wouldnt like the sound..but well worth the money :)
    ..
    · Share on FacebookShare on Twitter
  • TNHNDYMAN
    TNHNDYMAN Posts: 2,145
    edited August 2013
    Glad it was a simple fix and you are enjoying it.
    2-ch System: Parasound P/LD 2000 pre, Parasound HCA-1000 amp, Parasound T/DQ Tuner, Phase Technology PC-100 Tower speakers, Technics SL-1600 Turntable, Denon 2910 SACD/CD player, Peachtree DAC iT and X1asynchorus USB converter, HSU VTF-3 subwoofer.

    · Share on FacebookShare on Twitter
  • boston1450
    boston1450 Posts: 7,639
    edited August 2013
    I honestly thought it was something that was bad & was going to need to go to shop. PHEW. Now time to sit back n enjoy :)
    ..
    · Share on FacebookShare on Twitter
  • PolkieMan
    PolkieMan Posts: 2,446
    edited August 2013
    That's the one to find at a garage sale or thrift store get it home flip a switch and it's fine.:biggrin:
    boston1450 wrote: »
    I honestly thought it was something that was bad & was going to need to go to shop. PHEW. Now time to sit back n enjoy :)
    POLK SDA 2.3 TLS BOUGHT NEW IN 1990, Gimpod/Sonic Caps/Mills RDO-198
    POLK CSI-A6 POLK MONITOR 70'S ONKYO TX NR-808 SONY CDP-333ES
    PIONEER PL-510A SONY BDP S5100
    POLK SDA 1C BOUGHT USED 2011,Gimpod/Sonic Caps/Mills RDO-194
    ONKYO HT RC-360 SONY BDP S590 TECHNICS SL BD-1
    · Share on FacebookShare on Twitter
  • teekay0007
    teekay0007 Posts: 2,289
    edited August 2013
    Randy, which pre to you have and what are your thoughts on it compared to your other AVRs or 2-ch receivers?

    Congrat's on the new-to-you setup! :cool:
    · Share on FacebookShare on Twitter
  • boston1450
    boston1450 Posts: 7,639
    edited August 2013
    Thanks for asking. I listened to it for about a hour before the misses got home & there is no comparison.(although receivers work nicely too). It seems the quality is more cleaner. Robust. I brought it to 10:00 or so. and sounded very good to my ear. I listened to some N Young on the Nakamishi 500 & perfect. I hope to play around some more today with it & adjust some of the buttons. I need to research unit as i didnt get a manual for it. I do not listen to music at high high volumes anymore. I find it relaxing to put it at 9 oclock and sit back & enjoy it :)
    ..
    · Share on FacebookShare on Twitter