04-18-2015, 02:41 PM
So far, after wiring up two 12AX7 tubes as line, driver & phase inverter and using two 6V6GT tubes running at 32mA each the transformer does not even get warm. However 32mA is high for 6V6GT tubes, so I increased the cathode resistor for the push-pull 6V6 pair to 390 ohms and dropped the current per tube to 26.5mA where the whole arrangement runs quite cool. B+ is running about +330V at the first electrolytic cap and +325 at the second electrolytic cap which is after the choke.
Power transformer is quite cool to the touch even after an hour or so of operation.
Joe
Power transformer is quite cool to the touch even after an hour or so of operation.
Joe