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Class-A2 and Single-Ended Design - Tube CAD
https://tubecad.com/2018/01/blog0410.htm
A scoundrel, indeed. Class-A2 means that we purposely allow the output tube to enter positive-grid bias, so that the usually super-high impedance grid becomes a low-impedance load as the grid begins to conduct current; when the grid goes positive relative to the cathode, the grid becomes a forward biased diode with the cathode.
Class-A2 & Evermore Single-Ended Amplifiers - Tube CAD
https://www.tubecad.com/2016/12/blog0365.htm
Thus, the driver tube will see a lower cathode-to-plate voltage than the power tube, which means that we run the risk of the driver tube entering positive grid voltage. In short, class-A2, whether in a single-ended or push-pull amplifier, requires much more thought than most expect.
811A Single End Class A2 Audio Amplifier – GeeSeang's ...
https://geeseang.wordpress.com/811a-single-end-class-a2-audio-amplifier/
811A Single End Class A2 Audio Amplifier 811A is a high mu triode transmitter tube design for Class B push pull amplifier in audio and RF . In order to run into class A single end it must bias in positive grid instead of negative grid , so they call it Class A2 .
TL Audio Ebony Series A2 Class A Stereo Tube Processor …
https://reverb.com/item/1761344-tl-audio-ebony-series-a2-class-a-stereo-tube-processor-eq-compressor
Unit has the same tube from factory (sovtek 12ax7). OVERVIEW The Ebony A2 Tube Stereo Processor is a sleek-looking discrete Class A processor designed to heighten your audio experience. It uses Discrete Class A circuitry and has an optional tube stage with variable drive putting you in control of how creamy or how cool your unit sounds.
IT in cathode for driver class A2 tube | diyAudio
https://www.diyaudio.com/community/threads/it-in-cathode-for-driver-class-a2-tube.223386/
IT in cathode for driver class A2 tube | diyAudio WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES. Building, troubleshooting and testing of these amplifiers should only be performed by someone who is thoroughly familiar with the safety precautions around high voltages. Amplifiers Tubes / Valves
Electra-Print.com 211 A2 Amplifer
https://www.electra-print.com/211a2.php
211 tube amplifiers have always delivered a nominal 12 to 20 watts in Class A operation and gained acceptance for this service. As a means to deliver more power from the 211 tube, we at Electra-Print Audio have updated the traditional design using Class A2 operation delivering easily over 40 watts due to higher swing high voltage music power.
A2 Buffer - Pete Millett's DIY Audio pages
http://www.pmillett.com/A2_buffer.html
power tube to operate in class-A2 operation (or download it as aPDF file): This is a simple N-channel MOSFET source follower, with a CCS load using an Ixys IXCP10M45S part. The bias (standing) current through the buffer is set by R2/R3 above. too critical... I wound up using 100 ohms, which gives around 25mA through each of the circuits.
3B7 SE A2 Hybrid Amp - Pete Millett's DIY Audio pages
http://www.pmillett.com/3B7.html
driver, though the datasheet does show data for class AB2 audio use. It turns out it's a decent audio tube, and can produce a little bit of power if operated in SE A2. It's also cheap (between $5 and $8 each), and readily available - the two vendors I pinged had thousandsof them in stock. I Here's a datasheet.
audio lecture 49, high mu triode 572B, for class A2 AB2 ...
https://www.youtube.com/watch?v=XW0OsvPaIWI
572B is a powerful direct heated triode for class A2 / AB2 enthusiasts. Easy to get 80 watts with true power triodes. 572B is compatible with 811A.
audio lecture 34, 838 zero bias high power triode, class ...
https://www.youtube.com/watch?v=a0Hm7PJv7c4
838 is rarely found on eBay. Great electron tube for high power audio amplifiers : class A2 or AB2.
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