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. Typical of the SOVTEK brand, these are built well and sound great.
GENALEX GOLD LION PX2A3. Made in Russia Gold Pins Heavy gettering The ultimate current production 2A3.