[Scott Fletcher]

Thanks Mondial for your reply. I guess I was of the wrong impression that push-pull was always class B. Thanks for your clarification. Maybe you can give me your opinion as to whether a Hammond 125E output tr. would work for me in this Philco 90. I realize that the secondary tap chart only goes down to 1.5 ohms, but if you use the formula for reflected impedance(turns ratio squared times the .7 ohms speaker impedance) you can pick a secondary tap which comes close to the 6700 ohms required by the output tubes. My thought is that the chart with this tr. only goes down to 1.5 ohms just for convience and that a lower tap value could be calculated and would work. I have verified the turns ratio by applying low voltage on the secondary and measuring the primary voltage using a dmm for measurment. Any and all thoughts are appreciated.

Scott