Hello. I'm 76 years old. I are in my L7 !

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I will use a bridge rectifier circuit with 4 x 866A/3B28 tubes.

I think you're making things a lot more complicated on this point, even though it's nice to see this type of tube working.

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3 new Penta Labs 4-400C tubes in a parallel

Are you considering neutrodynizing the PA? This is where it gets more complicated compared to a ground grid. The big advantage is the gain, but you'll lose it in the aperiodic input circuit.

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73

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F1AMM

Fran?ois