2019年1月19日 · As for listening test, I played several type of music, this 2A3 SE amp is much differ from my previous 6SN7-2A3 or 717A-2A3, the plate choke can really store energy and I get more detail, very dynamic, very satisfying bass, and huge soundstage. Here’s my ugly hand drawn schematic diagram: A short video here with Fourplay “Chant” :

2023年3月15日 · It's actually more than 12W because the cathode resistor gets the 60 mA from the 2A3 plus 4-5mA from the resistive network that sets the 12AX7 anode voltage and grid-to-cathode bias for the 2A3.

ご要望で付加した機能はヘッドフォンジャックとSP出力インピーダンス、 4－8Ωの切替SWです。 回路は2A3シングルの標準的なもので、このとおりに作れば 誰でも失敗無く完成できるシンプルなものですが、それだけに 部品配置や配線の取り回し、ケースの仕上げなどに集中できて楽しめるアンプです。 付加機能としてヘッドフォン端子とSPインピーダンス4－8Ω切替を設けました。 （XE－20の場合カタログ上は8と16Ωしか記載されていませんが、 一次2.5Kで使う場 …

This amp uses a Class A single-ended tube output and is designed to work with a preamp or other high-impedance source. In theory, at least, Class A tube amplifiers when properly biased and with a bit of negative feedback can produce the clearest, cleanest tone.

2008年1月8日 · Approx. 30W anode dissipation for 2A3, 6 months, no problems! Plasma tube is originally developed by Asparuh Jeliazkov, constructor of BG Full Range driver named "Ether". It is quite different from classic VR tubes. Simply change two 5k1 resistors with others, with value 68k/1W. Caps are 3TO-1 or K52-2, AgTa, russian military made.

This 2A3 SE valve amplifier is a class A power amplifier which has high linearity and low distortion, are capable to delivery 5W to 8Ω speaker for each channel. The first stage is SRPP constructed by 6SN7 twin-triode tubes and the final stage is a common-cathode 2A3 tube. The high voltage is supplied by a RT400 tube rectifier.

2012年12月11日 · Anybody seen a list of 2A3 single ended designs out there? Looking for comparisons and pros and cons - in particular, curious about the newer, current production amps vs vintage amps. 1. Tango http://www.single-ended.com/2A3/2A3single.htm. 2. Shishido http://lagarto-ex-infoseek.jp/shishido/shishido-skema.htm. 3.

2010年3月22日 · I did some more measurements. I used a 8 ohm resistive load at the output instead of my loudspeakers (B&W DM602). The roll-off at 20KHz is only 0.7dB under the response in the pass-band. How is this possible? Is it normal with DHT SE amps to expect such a heavy HF roll-off with the speakers connected (-3dB @ 8-9 KHz)?

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2021年6月27日 · Ask a group of tube amp lovers which is their favourite of all the directly heated triodes, and you will almost always get a majority in favour of the 2A3. Sweet and airy but still punchy, very musical, most of the midrange excellence of 300b with none of the treble limitations, so the consensus goes.