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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Re: Looks like we got a preamp problem... posted by Vinnie on December 27, 2004 at 05:51:55:
The power tranny and the output cap would appear to be fine. The power tranny may be buzzing because you're powering it off the variac. We'll look into that more later.Here's what I would do next:
Restore the bypass cap to the 6N7. Make sure the 6N7 is wired properly--you have 4 & 5 tied for the grids, and you should have 3 & 6 tied for the plates, and 8 for the cathode resistor.
Disconnect your preamp from the amp, turn it on and make sure you don't have any measurable DC from the output to ground. A leaky output cap could cause the problem you're having.
Is there any way you can place a volume pot at the input of the amp (anything from 25-200K would suffice) and test the amp with your CD player or source directly inputted? That would tell us a lot.
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Follow Ups
- Re: Looks like we got a preamp problem... - groverg 09:23:56 12/27/04 (1)
- Re: Looks like we got a preamp problem... - Vinnie 10:38:30 12/27/04 (0)
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