I trained and worked with transmitting valve circuits

Ah right! No problem then. Well, as you know, you are looking at a push-pull
amp with beefy tubes, and not paralleled. I personally wouldn't go above 350v
or so but if you're feeling hardy you'll get more watts. There's a number of
posts on the asylum extolling 211 and 845 amps at lower voltages, but you lose
the power. Have you heard the Nagra for starters? Is your system balanced or
unbalanced?

=== Andy Evans ===
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