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The 2A3 Tube Amplifier - A Tribute to Simplicity and Warm ...
https://audioxpress.com/article/the-2a3-tube-amplifier-a-tribute-to-simplicity-and-warm-sound
The 2A3 vacuum tube is a power triode capable of outputting 3.5 W in a single-ended Class A configuration. In this project, the 2A3 power tube runs at a 60-mA plate current with no signal applied and has a 410-V plate voltage. The output transformer’s primary impedance is 3.3 kΩ (see Figure 1).
VinylSavor: Tube of the Month : The 2A3
https://vinylsavor.blogspot.com/2018/03/tube-of-month-2a3.html
The 2A3 is a directly heated output tube which enjoys continued popularity over the decades and is even still made to day by various manufacturers. It shares the same UX4 base and pinout with other triodes like the 45, 300B, 10Y and many more. In single ended operation it is good for 3.5W of glorious output power.
🥇What’s the Best 2A3 Tube? (Reviews & Buying Guide – …
https://sonoboom.com/best-2a3/
Sovtek 2A3 Power Vacuum Tube (Editor’s Choice) This Sovtek model is the best 2A3 tube …
2A3 - The Mother of High Fidelity - World Radio History
https://worldradiohistory.com/Archive-All-Audio/Archive-Audio-Magazines-Other/Archive-Vacuum-Tube-Valley/Vacuum-Tube-Valley-12.pdf
Thus was born the 2A3 (develop- mental number A181C, introduced January 10, 1933). Despite being intend- ed as a low-cost tube for a new thing called "high fidelity" sound amplifica- tion, the original 2A3 had a very com- plex harp filament, consisting of 24 short segments in parallel.
Vacuum Tube - 2A3, Sovtek | Antique Electronic Supply
https://www.tubesandmore.com/products/vacuum-tube-2a3-sovtek
The shipping was real fast and the Sovtek 2A3 works just great in my little amplifier. Nice clear, clean sound. It replaces a JJ-2A3-40 that failed at about 1000 hours.
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