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Summer / Consolation Amplifier: 1995 Adcom GFA-5200
Summer / Consolation Amplifier: 1995 Adcom GFA-5200
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Old 5th February 2014, 07:31 AM   #21
vanuchao is offline vanuchao
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Thank you for the answer.
I put the NIC Components 12000uF 50V NRLRW123M50V30X50SF sound changed, became less distortion. I expect that there will be more bass, but for some reason it was less than Cornell Dubilier 6800uf.
Input kondentsatory I replaced the jumper without them a little cleaner.
I lack bass. Where to dig?
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Old 6th February 2014, 09:33 PM   #22
Andersonix is offline Andersonix  Sweden
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Summer / Consolation Amplifier: 1995 Adcom GFA-5200
Dig for more bass with an amplifier with more than one output transistor in parallel. This little single transistor per rail 5200 is never going to deliver a lot of current, although it will try to destroy itself before blowing the rail fuses. In my case of now having almost 100,000uF per rail (and plans for more caps to make PS rail ripple lower), bass impact is better than stock, but it's clearly not a bass amp...
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Old 5th March 2015, 10:57 PM   #23
ripblade is offline ripblade  Canada
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Default Ac coupling cap

Hello, does anybody know if the input coupling cap be bypassed, or is it necessary? I have a line on a pair for sale but the seller is asking a bit of a premium. If it turns out the caps can be bypassed that might be the nudge I need to take the plunge.

Thanks in advance.
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Old 5th March 2015, 11:47 PM   #24
Zen Mod is offline Zen Mod  Serbia
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Summer / Consolation Amplifier: 1995 Adcom GFA-5200
funny - I can't find 5200 sch in my pc

however , if it's similar to 5400 regarding input stage - yes , you can short that input cap

that's idiot-proof part in there
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Old 6th March 2015, 12:30 AM   #25
marsupialx is offline marsupialx  United States
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ZM, your PC must be a treasure chest full of electronics stuff. The NP stash must be immense, and then the tubes!!!
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Old 6th March 2015, 04:33 PM   #26
ripblade is offline ripblade  Canada
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Quote:
Originally Posted by Zen Mod View Post
funny - I can't find 5200 sch in my pc

however , if it's similar to 5400 regarding input stage - yes , you can short that input cap

that's idiot-proof part in there
That's what I was hoping to hear. Thanks!
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Old 14th June 2015, 01:02 AM   #27
Andersonix is offline Andersonix  Sweden
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Summer / Consolation Amplifier: 1995 Adcom GFA-5200
Summer's here, and I'm pushing my luck with my over-achieving little 5200. I've got a fan blowing on it but prob need another one, as it gets very hot (can still touch for 10s) as the bias has been increased to 0.8A, so that's 20W of class A. PS ripple is below 6mV. More caps to add to get that below 5mV. And then I'll have to stop playing with it and move on to a proper F5.
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Old 15th June 2015, 11:53 AM   #28
Chamberman is offline Chamberman  United States
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Quote:
Originally Posted by Andersonix View Post
....I'm pushing my luck with my over-achieving little 5200.
Yup, you are up to 31 - 32W per device now. As long as you can keep the heatsink temp reasonable it might hold up for a long time though. I would be more concerned about my speakers if the amp dies, this being due to the lack of DC output protection on this amp.
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Old 15th June 2015, 06:15 PM   #29
Andersonix is offline Andersonix  Sweden
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Summer / Consolation Amplifier: 1995 Adcom GFA-5200
I have a secret trick for keeping it cool: just play it loud ALL the time...
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Old 15th June 2015, 06:20 PM   #30
Chamberman is offline Chamberman  United States
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Better to heat the voicecoils than the heatsinks right? Just don't go too far out of Class A or it'll get worse.
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