YJShort Product Image

The YJShort is shorter than the standard YJS converter, allowing for use in amps that do not have room for the standard converters. It is a specialized, current-limiting/voltage-conditioning adapter for use in most 20 to 100 watt amps which use 6L6, EL34, 6550 or 6V6 output tubes. All Yellow Jackets® converters come with JJ Brand EL84/6BQ5 vacuum tubes.

  • Converts most audio amplifiers with 6L6s, EL34s, 6550s or 6V6s to EL84s without modification or rebiasing.
  • One year warranty for manufacturer defects
  • Safe for all common amplifiers and transformers.
  • Short enough to fit in most Blackface Fender® heads

The Yellow Jackets® pentode versions provide more bite and attitude, while the triode versions provide greater power reduction and more linearity. If you are looking for power reduction and response with more bite and attitude, choose the pentode version. If you're looking for maximum power reduction and want to tame the response of your amp, choose the triode version.

Standard Version
Triode Version
Class AB to Class A operation
Class AB Pentode to Class A Triode
Drops Output Power
50% to 70%
70% to 90%
Product Manual
Additional Documents
Select a Yellow Jacket® below to see product details.