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Old 6th March 2010, 07:58 AM   #11
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O.K I finally managed to pinpoint the source of the runaway bias current. The culprit seem to be the coupling caps C9 and C11. I've been using N.O.S. paper in oil caps. It turnout to be leaky and acting like a resistor. Once replaced with new propylene caps the bias current stable. To bad these caps are very expensive and both of them are leaky.
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Old 6th March 2010, 11:24 PM   #12
rknize is offline rknize  United States
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Bummer. If you really want PIO caps there, try some of the Russian ones being sold on eBay. They are quite inexpensive and the few that I have bought have all been fine.
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Old 7th March 2010, 02:13 PM   #13
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Is it safe to say that Sophia Tubes are off the hook now?

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Originally Posted by drazmanithnin View Post
To bad these caps are very expensive and both of them are leaky.
As for the oil caps, just get Jensen and not deal with such risk.
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Old 7th March 2010, 03:53 PM   #14
rknize is offline rknize  United States
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Caps are one place where vintage is not the way to go, IMO. I just had to replace a couple of the film caps in my HP IP-32 power supply because they were leaky and making the voltage drift all over the place.
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