The svetlana from original svetlana Russian factory brown heavy base - quiet, noteworthy amazing tube. Nice swirling harmonic content. The construction of the tube is outstanding and I feel it contributes to the overall performance.
Reference tube is tested first then the tube listed for sale.
Reference tube is tested first then the tube listed for sale.
Rectifier 5C3S - 5U4G, 5U4GB, 5AS4A - dual-anode, directly heated 1968 PCS1. TEST: Uh=~5V, Ua=2 X 500V, R Anode resistance = 2KOhm, Cf=4 μF. Anode resistance: 2000 ohms. Filter capacitance: 4 μF. I will do my best to solve your problem.
These are the real deal & in many peoples opinion, are only surpassed by older tubes that are double the price !