Direct heated triode JAN 45 self bias is used for power tube and amplification is 6SN7 SRPP circuitry designed by myself. Relatively big Tango Power transformer affects the sound quality not a little.
The reason to use 45 ST tube is that the pure pre-war type triode has the tendency to produce the third harmonic distortion quite a little and the most of distortions left are second harmonic distortion. This means the sounds that is confortable on the ears, and make it possible to use it for long period of time requiring any patience.
The production company of this new JAN 45 is Radio Company of America, RCA. Though the sound is a bit hard and scratchy, some period of aging would make it better.
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