For amps with four power tubes.
100 watt Marshalls and
80 to 135 watt Fenders

For Fenders made before 1980 (not reissues.) Allows you to cut out two tubes for half power. Easy installation, requires drilling for a switch. 20 min

50-100 Watt switch
Am505 amp kit$26.95
4-power-tube-amps: 
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