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RE: Pre-Amp Kit 2.0. DC in Output, Help

Posted by J Corner (A) on January 14, 2014 at 06:56:28

In Reply to: RE: Pre-Amp Kit 2.0. DC in Output, Help posted by Vincin on January 14, 2014 at 01:36:26:

Thank you very much Vincin,

I do not know too much about these things.

The Line Stage Board is quite simple, it has several resistors, the two ECC82 valves and three capacitors per channel:

1- 0.47 uF - 400V MKT big golden AN Copper Foil paper in oil and connected directly to the valve's plate.

2- 470 uF - 16V Electrolytic connected directly to the valve's cathode.

3- 100 uF - 450 V Electrolytic connected to ground.

I guess the bad ones are the No. 1 ???

One channel has ~2 DCV output the other one ~10 DCV output!!!.

I measured the capacitors with my capacitor tester and seems okey. Are these DC leakings detectable with these tester ?


Thank you again.

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