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RE: something to keep in mind:

Posted by twystd (A) on March 25, 2015 at 15:46:23

In Reply to: something to keep in mind: posted by Ralph on March 25, 2015 at 14:10:31:

"Since both the output tubes and the transformer are going to cause a reduction in this voltage, you will need to swing a lot out of the driver tube."

That was what I was trying to determine, looks like the driver will have to swing at least ~103vp to fully drive my PP power tubes (6p36s), if I understand this correctly.

"Something else to keep in mind- the output impedance of a cathode follower is generally lower than that of a plate circuit- it may well be that the 5K primary winding impedance of the Softone might be a tad on the high side."

Not really following you there. Are you saying that the cathode feedback windings turns the PP power tubes into a form of a cathode follower, and therefor lowers the effective plate resistance of the power tubes?

BTW, the driver I was thinking about is a choke loaded differential pair of 6e6p-drs. That driver pair would in turn be driven from a 6n6p parafeed line stage, that uses a custom 3:1+1 parafeed autoformer splitter on the output.

twystd

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