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

113.162.152.131

Vincin

In Reply to: RE: Pre-Amp Kit 2.0. DC in Output, Help posted by J Corner on January 13, 2014 at 17:27:53

You have a bad output capacitor, that is leaking DC. Replace it.

Follow Ups:

RE: Pre-Amp Kit 2.0. DC in Output, Help - J Corner 15:46:27 01/17/14 (0)
Thank you Vicin, I already ordered a pair of Jensen caps.
RE: Pre-Amp Kit 2.0. DC in Output, Help - garymuffley 13:31:48 01/16/14 (0)
Vincin is right. The .47 MFD coupling caps are bad. Older versions of the Audionote paper in oil caps were notorious for developing DC leaks.
RE: a little more Help - J Corner 01:39:37 01/15/14 (0)
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.
RE: Pre-Amp Kit 2.0. DC in Output, Help - J Corner 06:56:28 01/14/14 (0)
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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