> Attached, please find a great book about tubed amplifiers.

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Hello

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Thank you for this communication.

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Even if it does not answer my question, this document is very interesting, both at the technological and implementation level.

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I reformulate my initial questions:

·???????? What is the maximum anode current (reasonable) for a 3-500Z tube

·???????? What maximum current can be used in a Drake L 7 to bake the tubes (not in RF operation), compared to the transformer capacity for example.

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I measured some characteristics of the HV transformer (measured in short circuit)

·???????? Transformation ratio

o?? In CW: 2.95

o?? In SSB: 4.14

·???????? Resistance brought back to the secondary

o?? In CW: 13.4 ?

o?? In SSB: 18.6 ?

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