Lowers the power of the amp and changes 
the tone to a smoother, harmonically rich character

A switch to lower the power of a two power tube, or four power tube amp by switching the power tubes into a different mode - called triode. Lowers power by about 40%. Has a softer tone also. Often confused with Class A. requires drilling a hole. moderate level 50 min

Triode Pentode 1/2 power switch
Am554 amp kit$45.00
amp-model: 
final notes on web page

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

Copyrightę Torres Engineering 2017. All rights reserved.

Shipping, Terms and Conditions. Privacy Policy.

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