Tube DIY Asylum: Re: Looking for a GOOD 211 / VT4-C Schematic by Paul Barker Do It Yourself (DIY) paradise for tube and SET project builders.

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Posted by Paul Barker (A ) on July 18, 2003 at 00:20:54

In Reply to: Looking for a GOOD 211 / VT4-C Schematic posted by Super_BQ on July 17, 2003 at 23:47:58:

The fi and Kondo schematics both rely on class A2 operation, and so also rely on cathode follower drive. This is how to get power out of a 211 at low voltages (yes sub 1kv is low voltage when discussing transmitting bottles).

That said the 211 is made for a little class A2 operation.

If you prefer to stay in A1 you could adapt many schematics.

Determine how much power you want, and we'll see if that's possible in A1 and at which operating point, into which load.

When we know the quiescent bias voltage we will know the required drive voltage, and can work backwards form there. It now depends upon how much power you require at the output and how much input volatge (sensitivity) your system can provide, as to whether you will need one stage or two before the 211.

Give more info.

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