5U4G Shoulder Shape Shuguang Full wave rectifier Bugera 5U4
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 5C3S rectifier tube like used in LABOGA Mr Hector Head.
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
Premium Selected tubes are guaranteed for a period of 6 months (according to terms of warranties) for the quality criteria mentioned above.