6au6 preamp stage

scrimpu · 25th September 2012, 05:04 AM

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.

artosalo · 25th September 2012, 05:55 AM

I have used this:

There is a 680 k trimmer pot at the screen grid. With it the optimum operating point can adjusted.

scrimpu · 27th September 2012, 02:36 AM

Thanks, I should be able to adapt that to suit my purpose.

Original Burnedfingers · 30th September 2012, 12:51 PM

What B+ are you using?

scrimpu · 1st October 2012, 01:57 AM

B+ is 285v.

25th September 2012, 05:04 AM	#1
scrimpu diyAudio Member Join Date: Jan 2012 Location: Grand Rapids, Mi	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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25th September 2012, 05:55 AM	#2
artosalo diyAudio Member Join Date: Feb 2010	I have used this: There is a 680 k trimmer pot at the screen grid. With it the optimum operating point can adjusted.

27th September 2012, 02:36 AM	#3
scrimpu diyAudio Member Join Date: Jan 2012 Location: Grand Rapids, Mi	Thanks, I should be able to adapt that to suit my purpose.

30th September 2012, 12:51 PM	#4
Original Burnedfingers diyAudio Member Join Date: Nov 2002	What B+ are you using?

1st October 2012, 01:57 AM	#5
scrimpu diyAudio Member Join Date: Jan 2012 Location: Grand Rapids, Mi	B+ is 285v.