Help: Driver Stage Design

[HP8903B]

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[Vinylsavor]

Hi!

How do I find out the output voltage of a driver stage ?

The output voltage of the driver depends on the coupling you choose (RC, CCS, interstage, LC) and the op point of the driver point. Draw the op point into the plate curves and derive the output voltage which can be obtained from there.
Or simply breadboard the driver stage and measure.

How do I find out the driving voltage required for an output tube ?

This depends on your op point.

If you run the output in Class A1 and your output tube bias is -X Volts, then you need a voltage swing of 2X or expressed in RMS voltage: X divided by square root of two. Add the desired headroom.

Best regards

Thomas

 

[Vinylsavor]

This might help a little:

VinylSavor: The search for that 'magical' operating point

Thomas

 

[HP8903B]

Hi Thomas,

Very informative article. Thank you.