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Rather than waste all that work...

Maybe it would be worthwhile to analyze the design in more detail. For instance, which OPT did you use? Have you posted a current schematic of the amplifier (maybe I missed it)? Also, you might consider a 211. Unlike the 845, the 211 was originally designed for audio service. There's a distinct difference in the sound. Assuming the OPT is in the ballpark (~10K), you might only need to reduce bias voltage to drop in a 211. With 1KV on the anode and -52 on the grid, the tube will idle at roughly 70mA. Just food for thought...

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