Tube Amp Doctor 5AR4 STR Rectifier Tube

Tube Amp Doctor 5AR4 Rectifier, Premium Selected

A faithfull reproduction of the Mullard/VALVO GZ34.
Pure power and the typical sag have been the distinguishing characteristics of the most popular guitar amps of guitar heroes since the 1960s.

Upgrade for 5U4GB and 5U4G.

Q: When does a tube become a Premium Selected tube?
A: All tubes labeled Premium Selected have passed the following tests:
- Plate Current (PC) and Amplification (TC)
- Low Noise Test
- Microphonic Test
- Sonic Tests
- Shock Tests
- Listening Tests
- Shorts & Leakage Tests