I brought this project with me from Russia, translated the article I had found in the Audio journal where it had been published and some effort to have it published in Swedish journals - but in vain. It is like a curse. If it is Russian it is very interesting but ... I have tried to sell a pair of Russian built monoblocks (60W) and, yes they are mighty, they sound very good, but they are Russian and therefore in a way "priceless", meaning even a dollar, a pound or an euro is too much. To publish something from Russia "Cheap, supersounding headphoneamp" is maybe interesting, but we have an article about a Japanese preamp made up by a unique $5000-valve ...
Anyhow, what struck me when I projected the Elektor SRPP-amp, struck me here as well: no need for a phono-amp. I simply cout out the phonostage, not considering the fact that the pentode was a substantial part of the differental-stage, but it worked. I haven't tried to make the adjustments - I am too lazy for that. I don't think that could solve the two major problems I have: a slight hum at high listener levels and a transformer running hot.
|R1||47K, ½W, (1%)||R21||1K8, 2W|
|R2||110K, 1W, (1%)||R22||1M2, 1W|
|R3||2K2, 1/2W||R23||240K (A)|
|R4||56K, 1W||R24||22K (B)|
|R5||68K, 1W||R25||1K, 1/4W|
|R6||51K24, 1/2W, (1%)||R26||1R, 2W|
|R10||5K1, 2W||C3||5n38 (1%)|
|R11||6K8, 1/2W||C4||1n802n (1%)|
| 15 kohm, ½W