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JJ Electronics 5Y3 rectifier. Spiral Filament
I always test my new tubes on a tester before putting them in service. The new JJ 5Y3S tested weak, almost into the red on the tube tester.
Great value. Worked nicely in a silverface champ.
The JJ 5Y3 seems to be a really well constructed current production tube. Unlike the Sovtek, which has a sleeved heater, the JJ is the traditional style. While has a higher forward voltage drop than the Sovtek, some older equipment cannot handle the higher B+ of the Sovtek. I really like this JJ tube.
I reviewed the JJ 5Y2S rectifier tube and found it to be rated for high voltage and directly heated, like the original RCA 5Y2GC that came in my Supro. I have been playing the amp a lot and see no coloring or degradation of signal or plate voltage. I would recommend this tube as a cost-effective replacement.