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

Junction Blvd

Roseville CA 95747

this is not a "walk in" shop

I am retired due to illness, sorry

in business 35 years