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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: What is happening??? posted by Vinnie on December 24, 2004 at 14:32:06:
First, double-check the orientation of all diodes and capacitors.Second, are you using a separate transformer for the bias supply? If you are taking the bias off the main B+ tranny, you can create some sort of power-supply feedback that will cause the amp to shut down the music signal.
Since there's no feedback in the amp, and it's single-ended, it's unlikely to be a phase issue. But there could be some kind of low-frequency overload. Did you improvise any off the bypass or coupling cap values? With fixed bias, if you overload the power stage's grid, and the coupling cap is too large, you can run into a siutation where the grid goes into cut off and doesn't recover until you shut down the amp for a few minutes. (I'm sure someone else could describe this better than I could.)
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- Re: What is happening??? - groverg 18:50:00 12/24/04 (0)
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