Incredibly informative info on preamp tubes.

Tweaking Tubes - Incredibly informative info on amplifier preamp tubes. Substitutions, tricks, what goes where suggestions and performance tricks. Awesome!

final notes on web page

Dan's Legendary Book "Inside Tube Amps" is now available on Amazon/Kindle

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Torres Engineering

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Yuba City CA 95993

this is not a "walk in" shop

I am Partially retired due to illness, but getting better!

in business 48 years