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Post subject: '79 Princeton Reverb tube question.
Posted: Thu Feb 11, 2010 8:54 am
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The tube sheet inside of the amp shows 2 12ax7's, a 12at7, and a 7025. Can I put 4 12ax7's in instead? Will it effect the sound of the amp any? Oh, and does it need to be biased if I replace the 6v6's?


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Posted: Thu Feb 11, 2010 9:39 am
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Joined: Mon Feb 25, 2008 8:47 am
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Location: Westchester County, NY
Yes, you would have to re bias if you change the power tubes. I believe it is a fixed bias, that means you may have to change some resistors in there.

This mod would make the change easier:

http://www.torresengineering.com/newfenprinre.html


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Posted: Thu Feb 11, 2010 10:48 am
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Joined: Sat Dec 13, 2008 11:49 am
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Location: South Bay, CA
Changing the preamp tubes can definitely change the sound - I went with JAN Philips 12AX7/WA in my 77 Princeton Reverb and it's made a great difference. Also retubed with Mazda NOS 6V6's and couldn't be happier.

kcanostubes.com is a great resource - you can email Mike your amp and playing style and budget, and he can give you recommendations on tubes - I've used him now for almost 10 years and have been very happy.

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