Undoubtedly, in its category, the 5R4GY was and is among the best rectifier valves ever produced. In particular this FIVRE NOS/NIB, genuine produced in Italy for military supply (code "21 ST") and therefore with a high standard of selection and quality; they are admirable! Absolutely flawless workmanship with large dark gray plates, mica locking on top and spring suspended filament. Highly recommended for power supply stages in Audio circuits.
EQUIVALENT: 5R4 = 5R4G = CV717 = 5R4G = 5R4GYA = 5R4GYB = 5R4WGY = CV684 = 5R4GYS - REPLACEABLE: 274A and B
Some of the equipment on which this valve is recommended to be used:
- Audio Note OTO LINE SE
- Audio Note QUEST
- Audio Note ONGAKU KENSEI
- Audio Note JINRO SHOCHU
- Audio Note TOMEI KENSEI
- Audio Note EMPRESS
- Audio Note GINREI
- World Audio Design 300B PSE
- Cary CAD300SE Signature
- Emotive Audio Sira linestage
- Woo Audio WA22
- RCA BA-6A compressor
- Fender Vibro-Champ 1965
- ModWright Sony
- SuperZen
- Tori Jr
- Rachael