I brought some seven Russian built Priboj amplifiers back to Sweden from Estonia. All except one was sold and the last one was modified according to plans made up by A. Likhnitsky (the constructor of the AML+ amplifier). From a 60W PP amp using dual beamtetrodes (6R3S-I) it was turned into a 12W trioded amp using the same OP tubes.
In practice, the tubes are rewired to run in triode mode, anode voltage is lowered. In the same process PSU is split to make the amplifier to operate as pseudo-monoblock.
Also the 6ZJ32 + 6N6P tube combo is replaced by a single 6N1P.
Description in Swedish (PDF)