The BIG BULB.

 

Big bulb vintage rectifier tube, used in high-end audio amplifiers but also in modern recto-type amps, such as the Mesa Boogie Double/Triple Recitifer. It can replace the 5U4GB. Its tone is smoother than that of a solid state rectifier.

 

Substitute for the 5Z3P / 5Z3P-J or 5C3S rectifier tube like used in LABOGA Mr. Hector Head.

 

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