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Single Ended Triodes (SETs), the ultimate tube lovers dream.

OK, for the sake of furthering the discussion ...



Here are my suggestions. Note, this is only a half way point, simple modifications that would provide VERY tangible benefits despite the compromise of type of tube used and lower than ideal HT voltage. Two large improvements are a result of swapping out the bypassed cathode R in the driver for Schottky diodes and DC coupling.

A little power is given up by increasing the R value on the cathode of the OP tube but the ability to transition well into A2 will more than make it up.

The driver is far more linear with a choke instead of an R and I find that a choke in this position is not detrimental to sound in the way a typical plate choke is.

I still prefer the sound with drive taken from the bottom tube's plate but you lose any worthwhile A2 transition (call it headroom).

Naz



Edits: 10/19/14

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