2A3 / 300B / 811 / 572

Directly Heated Power Triodes

Triode power tubes have a special place in audio, with its delicate sonic texture unlike that from any other tube amps. We have grouped these lovely triodes in a single category to better serve the interests of Directly Heated Triode fans.

2A3 - The Classic

2A3 was an upgrade of 45 triode. Sovtek 2A3 is a close replica of classic American 2A3 tubes, excellent for classical sources. Electro-Harmonix 2A3 Gold is very similar in construction to Sovtek 2A3, but it handles more contemporary sources better than Sovtek 2A3. JJ 2A3-40 sounds very close to their 300B, allowing you to listen to venerable 300B JJ sound with your 2A3 amp.

300B - The Legend

300B was designed as audio power triode by Western Electric. Electro-Harmonix 300B, both regular and Gold versions are reliable, provides clear and honest sonics and at decent price. Genalex PX-300B is one of the best current production 300B. It is meticulously built, handles 40W, and provides very good balance from bottom to top. Venerable JJ 300B is a good go-to choice, with its smooth and focused sound.

Super Triodes

We are one of the few dealers to stock SV811 and SV572 tube types. These tubes have special construction with bright Thoriated Tungsten filament from Svetlana. Despite Svetlana branding, these tubes were made at Ryazan factory in Russia. If you are into DHT DIY, these tubes are the ultimate in high power triode.