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Gfa 555 chassis
Gfa 555 chassis
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Old 10th August 2018, 05:18 AM   #1
AnthonyA is offline AnthonyA
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Default Gfa 555 chassis

Hello

I bought a gfa 555 from a local forum.

But alas, the driver board is no longer gfa 555 adcom. Other parts seems to be working.

Is there any nice diy project thats papa Nelson's. That I could make use to put inside the gfa 555, at least I could make use of the power supply and capacitor ? The voltage is 82vdc..

Thank you in advance for help
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Old 10th August 2018, 07:58 AM   #2
Zen Mod is offline Zen Mod  Serbia
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Gfa 555 chassis
for something smaller , in terms of voltage (rails) , while greater Iq (no other things in Paparealm) , there is a possibility to connect two 120Vac primaries in series , thus halving 82Vdc rail

however , you can do that if xformer is dual primary thingie , and you must be aware that resulting VA of transformer is also cut in half

we need more info , best covered with few pics , about actual situation in amp ... are electrolytics original , is it wort to keep them etc.
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Old 10th August 2018, 04:42 PM   #3
AnthonyA is offline AnthonyA
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Everything is original except for the driver board Screenshot_20180810-232950.png

Screenshot_20180810-232914.png
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Old 10th August 2018, 04:45 PM   #4
AnthonyA is offline AnthonyA
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1533919381015801876044.jpg
Thank you so much
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Old 10th August 2018, 05:06 PM   #5
Zen Mod is offline Zen Mod  Serbia
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Gfa 555 chassis
more pictures , better ones , please

from that one , I can see (?) that amp had hard life....... heavily cooked dust everywhere
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Old 13th August 2018, 12:41 PM   #6
AnthonyA is offline AnthonyA
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20180812_124517.jpg

20180812_124524.jpg

20180812_124536.jpg
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Old 13th August 2018, 01:41 PM   #7
Zen Mod is offline Zen Mod  Serbia
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Gfa 555 chassis
judging by overall condition , those caps are just for waste bin

so , now you have a great case and possibly xformer
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Old 13th August 2018, 07:18 PM   #8
mpmarino is offline mpmarino  United States
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...and if any of those Toshiba outputs test good - they'll move on ebay, or they're handy for the parts drawer. Sorta hard to find these days.

You could do what ZM said in post 2 to cut the voltage in half, and keep an eye out for the up and coming AB100
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Old 15th August 2018, 02:36 AM   #9
AnthonyA is offline AnthonyA
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Thank you for help.

Time for dismantle
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