Tube Amp Doctor 5AR4 Rectifier, Premium Selected A faithful reproduction of the Mullard/VALVO GZ34. Pure power and the typical sag is the distinguishing characteristic of the most popular guitar amps of the 1960s guitar heroes till today.

Made in St. Petersburg, Russia. The Winged C 6550 is considered by many to be the best 6550 tube that money can buy. Perfect for Guitar Amps, Leslies, and Hi-Fi applications.

This model of Yellow Jackets® converter, the YJR, is an adapter for use in most amplifiers which use 5AR4, 5U4, or 5Y3 tubes or other similar tubes. This Yellow Jacket® is a solid state device and as such does not come with vacuum tubes. Converts most audio amplifiers which use a vacuum tube rectifier 5AR4, 5U4 or 5Y3 to a solid state device. Safe for all common amplifiers and transformers. All Yellow Jackets® have a two year warranty against manufactured defects.

9 pin miniature preamp tube (Amplification Factor = 100). This Russian tube has strong lows and bright highs. Its lows demand attention when playing full bar chords. In overdrive, it offers a lot of crunchy fizz. For more information about our 12AX7 tubes, see our tech corner article on 12AX7s.