2:90 2:Ninety Bias mod?

Triaxis, Quad Preamp, Stereo Power series, Recto Preamp

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francm
Mark II
Posts: 68
Joined: Tue Jun 10, 2008 8:08 am

2:90 2:Ninety Bias mod?

Post by francm » Sun Aug 23, 2009 1:02 pm

Has anyone done this? I'd like to be able to adjust the bias in my 2:90 so I can try different tubes.

It looks like 2 of the tubes running at the -57 bias voltage are the ones I want to play around with since they are the Class AB pair while the other two are the class A power tubes with cathode bias. That make sense?

xcpointx
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Re: 2:90 2:Ninety Bias mod?

Post by xcpointx » Fri Aug 28, 2009 5:51 pm

Would be very interested in this..
http://www.strage.co.za
South African sludge - free to download. Recorded with Triaxis & 2:Ninety

francm
Mark II
Posts: 68
Joined: Tue Jun 10, 2008 8:08 am

Re: 2:90 2:Ninety Bias mod?

Post by francm » Wed Sep 02, 2009 5:01 pm

I'm actually working on this. I'm trying to figure out how to bias the class A section separately from the Class AB section.

vitod
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Re: 2:90 2:Ninety Bias mod?

Post by vitod » Wed Sep 30, 2009 1:55 pm

Interested in this.

robguitargod1
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Re: 2:90 2:Ninety Bias mod?

Post by robguitargod1 » Tue Mar 22, 2011 12:44 am

I'm all over this, and have designed a bias mod. Here's the thread I just started:

http://www.grailtone.com/forum/viewtopi ... =5&t=52816

Yeah, I know this thread is 2 years old.....

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