This circuit designed by Bruce and he has followed up his “OddWatt” project (EL84/6BQ5 Push-Pull) with the Oddwatt 225. The Oddwatt 225 is a scalable tube amplifier which will work with a number of octal tubes. In this build the driver stage is an SRPP with 6SL7 tubes and the output stage is a Class A UL SIPP with KT77 tubes. LM317 Regulators are used for the cathode CCS.
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