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Paul S wrote:

So this amp would not have to deal with a crossover?  One R and one L in the signal path, it looks like a headphone amp, maybe a dream circuit for a light piston, HF only, given no cap/coil load at the [ribbon] driver.

Why would not deal with a crossover? The amps will deal with crossover in the way identical to the Super Milq does-combining bias and filter just before the grid of the stage.

It will be hell of a mess to circulate everything considering the necessity to preserver the bias, the input impedances,  use different type of filters (perhaps some subtraction filers) but it is perfectly accomplishable)

It might be way simplified if each channel out of negative gas tube. It would be fine to keep one single negative source but I would more then 150V for 4 channels, perhaps 2 gas tubes but I do not know if the nesting of the gas tube would not affect sound as anything the go to the grid if VERY critical and VERY finicky.

Once again where the get the transformers for the thing? It would be 1K to 15R …..The upperbass and fundamentals channels might be cared by an amorphous version of this (inverted):

http://www.lundahl.se/pdfs/datash/1689.pdf

But how about the HF transformers? I would need something similar with less turns…. Anyhow I do not want to think about it until I verify that one signal 6E5P sound acceptable to drive compression drivers.

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