2A3 Historic Vacuum Tube
2A3 is power direct heated triode (DHT) high vacuum tube. This tube is called historic because of the reputation which has acquired over more of 80 years. For the first time is introduced in 1932 by RCA/Cunningham/Radiotron. The anode of the tube have rectangle shape called single plate or mono plate. This name “Mono Plate” is given to the early 2A3 edition tube to distinguish from the later production modifications with dual anode.
RCA/CUNNINGHAM/RADIOTRON 2A3 MONOPLATE TUBE
2A3 MONOPLATE OTHER BRANDS
2A3 DUAL MONOPLATE TUBE
2A3 Bi-PLATE TUBE
2A3 New Production
Two decades ago the manufacture of the historic triode 2a3 has been started. This tube is highly requested, so the interest in this tube is very high as buyers and manufacturers. It is currently manufactured in factories in China, the Czech Republic and Russia.
2A3 NEW PRODUCTION MANUFACTURER
PSVANE HIFI 2A3B TUBE
One of the actual manufacturer of new production 2A3 tube is PSVANE. It is a chinese manufacturer that has achieved fame in the last years. I just bought one mached pair of PSVANE HIFI 2A3B tubes. And in the same range of tubes I had purchased rectifier tube 5U4G. Lets take a look ot this ones tubes, please.