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Old 25th September 2012, 06:04 AM   #1
scrimpu is offline scrimpu  United States
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Default 6au6 preamp stage

Does anyone here know of a guitar amp that uses a 6au6 preamp? I have a hammond ao-29 I converted and I was thinking maybe I could get a bit more out of it. I have a few of these tubes but I dont know enough about pentodes to add one without a schematic.
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Old 25th September 2012, 06:55 AM   #2
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I have used this:

Click the image to open in full size.

There is a 680 k trimmer pot at the screen grid. With it the optimum operating point can adjusted.
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Old 27th September 2012, 03:36 AM   #3
scrimpu is offline scrimpu  United States
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Thanks, I should be able to adapt that to suit my purpose.
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Old 30th September 2012, 01:51 PM   #4
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What B+ are you using?
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Old 1st October 2012, 02:57 AM   #5
scrimpu is offline scrimpu  United States
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B+ is 285v.
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