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Adcom GFA-2 recap....should I replace rectifiers/snubber caps???
Adcom GFA-2 recap....should I replace rectifiers/snubber caps???
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Old 14th January 2015, 03:40 AM   #1
j.burtt is offline j.burtt  United States
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Location: North Texas
Default Adcom GFA-2 recap....should I replace rectifiers/snubber caps???

Replacing all electrolytic caps, adding real RCA jacks, binding posts and an IEC plug with ground.

For those of you not familiar with the GFA-2, it is a dual mono amplifier. It currently has (4) 1N5402 diodes forming a bridge rectifier for each channel. Each diode is snubbed with a .01uf/500v ceramic cap. Would there be any significant gains from updating the diodes and maybe some polypropylene film caps for the snubbers? Keep suggestions to individual diodes if possible. These are soldered into the board and I don't really want to extend the transformer wires.

Anyone with further info on low cost updates please thrown in your ideas.

I'll be ordering from Mouser because I get next day delivery for ground pricing. They're only about 60 miles from me.

Thanks,

James
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Old 14th January 2015, 04:49 AM   #2
gmphadte is offline gmphadte  India
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Those capacitors across each diode are not to be installed, but an RC snubber has to be connected across the secondary.

Gajanan Phadte
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Old 14th January 2015, 04:56 AM   #3
j.burtt is offline j.burtt  United States
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Across the transformer secondary before the bridge recitifier?

Any recommendations for the values. The resistor and capacitor will be in series, correct?
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Old 14th January 2015, 10:21 AM   #4
gmphadte is offline gmphadte  India
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Yes, and the resistor is the critical part.

The ringing that occurs due to diode fast turn off will be passed on to the load through the capacitor across thye diode.


For knowing how to do it, there is a thread here.
Search word snubber should do it, I think.

Gajanan Phadte
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