300B. A classic DHT (Directly Heated Triode) . Very popular in SET (Single Ended Triode) HiFi Amplifiers as a Power Valve or voltage regulator.
2A3. Power Triode. Four pin UX4 type base. Seen in many Mono Blocks and Class A amplifiers.
GENALEX GOLD LION PX300B. Made in Russia Gold Pins Heavy gettering Eight course heater The ultimate current production 300B.
EHX 300B. Russian manufacture. Eight course heater. Directly heated triode. Gold Pins. **Order two for Matched Pair.
SOVTEK 2A3 - Power tube Directly heated Triode - D.H.T. Made in Russia The best currently produced 2A3
GENALEX GOLD LION PX2A3. Made in Russia Gold Pins Heavy gettering The ultimate current production 2A3.
EHX GOLD 300B D.H.T. Gold plated grids Eight course heater Fresh stock ~2019 manufacture **Order two for matched pair