Adcom GFA 585 and SDA 1C's - Good Fit??

Bullet21
Bullet21 Posts: 69
edited February 2008 in Vintage Speakers
Looking for an amp for my 1Cs - would this be a good fit - found one pretty cheap in great shape...
Post edited by Bullet21 on
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Comments

  • ben62670
    ben62670 Posts: 15,969
    edited February 2008
    Better double check the DC offset on that amp, and pull the cover, and make sure the input caps are not leaking. Other than that it is an awesome amp. If you don't want it I'll take it:) In any condition.
    Ben
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • Bullet21
    Bullet21 Posts: 69
    edited February 2008
    How do I check the DC offset and I will pull the cover and look for any leakage... Heck I'll take a picture and post it!!
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  • John in MA
    John in MA Posts: 1,010
    edited February 2008
    Disconnect the amp from all inputs and outputs. Connect a DC voltmeter on the Mv range to one channel, like you would a set of speakers. Turn on the amp and let it warm up for 10-20 minutes. See what the meter is reading. Then connect the meter to the other channel and see what that says. Under 15mv should be fine, the higher the reading the more the amp needs differential repair or adjusting. Don't worry about negative readings, the polarity isn't important.
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  • Refefer
    Refefer Posts: 1,280
    edited February 2008
    A 585? Wow, be prepared to fully understand the definition of dynamics. How much do they offer up, like 400 wpc into 4 ohm?

    I'm envious ;)
    Lovin that music year after year.

    Main 2 Channel System

    Polk SDA-1B,
    Promitheus Audio TVC SE,
    Rotel RB-980BX,
    OPPO DV-970HD,
    Lite Audio DAC AH,
    IXOS XHA305 Interconnects

    Computer Rig

    Polk SDA CRS+,
    Creek Audio 5350 SE,
    Morrow Audio MA1 Interconnect,
    HRT Music Streamer II
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  • John in MA
    John in MA Posts: 1,010
    edited February 2008
    They're big suckers. Like two 565's in one cabinet.
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  • Bullet21
    Bullet21 Posts: 69
    edited February 2008
    Well I plugged the amp in let her warm up and took some readings... each channel gave me readings from .001 to .005 but the mostly stayed between
    .003 and .004 on the right channel and .002 and .003 on the left.

    Also pulled the top off and looked at the caps and I did not notice anything leaking... would it be very obvious like some sort of discoloration or maybe sticky film of some sort?? They boards actually look pretty clean.

    I'm kinda a rookie so any advice would be appreciated - i didnt take any pics yet!!!

    Also I'm a little emabarassed that I havent even tried to listen to it yet - got all excited about taking it apart:)
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  • ben62670
    ben62670 Posts: 15,969
    edited February 2008
    If those measurements were taken DC then you are good. The caps are on the input board, and they should say Elna on them. Where about are you located?
    Ben
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • Refefer
    Refefer Posts: 1,280
    edited February 2008
    Bullet21 wrote: »
    Also I'm a little emabarassed that I havent even tried to listen to it yet - got all excited about taking it apart:)

    Checking your gear always should come first. You don't want to play it for 5 minutes and realize you've just blown a couple of drivers, or your amp toasted your crossover. Check once, listen forever!
    Lovin that music year after year.

    Main 2 Channel System

    Polk SDA-1B,
    Promitheus Audio TVC SE,
    Rotel RB-980BX,
    OPPO DV-970HD,
    Lite Audio DAC AH,
    IXOS XHA305 Interconnects

    Computer Rig

    Polk SDA CRS+,
    Creek Audio 5350 SE,
    Morrow Audio MA1 Interconnect,
    HRT Music Streamer II
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  • Bullet21
    Bullet21 Posts: 69
    edited February 2008
    I am in Ft Worth Texas!! I'm really hoping this amp turns out to be solid - then I will be able to flip flop between my Magnepan IIIa's and 1C's - I got monos running my maggies now!!
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  • ben62670
    ben62670 Posts: 15,969
    edited February 2008
    A thump is normal when you turn on an Adcom
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • John in MA
    John in MA Posts: 1,010
    edited February 2008
    A thump is normal for any amp that doesn't use a delayed protection relay. Most older Adcoms are that way, I assume the 585 is.
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