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RE: What tubes to use with this Interstage Transformers?

Well, we can look at this from either side.

Let's see what the grid of the output tube sees looking back through the IT to the driver stage.

The 5k output impedance of your driver tube will look like 80k to the grid of the output tube.

AFAIK, 80k will not properly drive the Miller of any DHT I am aware of.

If you had a driver stage with 500 ohms output impedance that would look like 8k ohms to the output tube and that would be fine in most instances.

Tre'




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