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The ultra Killer Groove Tubes Substi-tube power reducer
replace larger 6L6/EL34's with EL84's and convert to Class A

Groove Tubes Catalog "An adapter which allows class A/B amplifiers such as Marshall and Fender, to replace their output tubes with the EL-84 tube, and operate in class A. This reduces the power of the amplifier. In the case of a 100 watt amp, the output will be about 40 watts. In a typical 50 watt amp, the power will be about 20-25 watts.

These are used in pairs or quads.

The substit-tube will reduce the load on your power transformer, and allow your amp to reach distortion, with a nice AC-30 or EL-84 sound and feel at levels that are lower and more friendly to recording and venues where your amp will not feel, play, or distort at the amplifier's normal higher sound levels.


Real, real good stuff!! they are very well made, very dependable and REALLY do the job.

They will bring your 50 watt amp down to 15/20 watts and your 100 watter down to 30 watts! Cool.


Groove Tubes SUBSTI-TUBE 928-PR Power Reducer IN STOCK
substi-tube duet$120.00
Duet or Quartet: 

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Torres Engineering
1630 Palm Avenue
San Mateo, CA 94402
Phone (650) 571 6887 Fax (650) 571 1507 Pacific Time 10:00AM-5:00PM.