In light of the JJ 2A3-40 plate dissipation of 40 compared to 2A3 which I think is around 15. How should I adapt traditional 2A3 schematics to get this extra wattage? Would anyone have an example of SE schematics specifically adapted for this tube, voltage/current? I'm coming up empty for proven schematics but if it's just as simple as getting the tube to run at a different voltage operating point, what would that be?
We built an amp with them, about 350V and 75mA, with a 3k5 OPT. Some say this tube is basically a 300B with 2.5V cathode.
Use 380...400 V as plate voltage and 75...90 mA plate current with 5k output transformer.
Ever see a DHT glowing blue on the glass. Someone we might know just turned up the juice on a pair of 10 year old Shuguang 2A3's. These are running at 380 volts and 70 mA with a 3000 ohm OPT. The amp is a TSE-II with no modifications other than a Hammond 372HX power transformer. The OPT's were the same Transcendar 3K ohm units used in a 300B amp. The amp doesn't see much use, but the tubes have been in it for over 10 years.
