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cv wrote:

I see why you want those tap options now - essentially you want to be able to load down the 6e5p but still use all the secondary sections. There may be some frequency response variations in the ultrasonic range by playing the tap game, but it shouldn't make all that much difference to what you hear.

Actually it is important to name properly- it is not the taps but just different connection of sections. I do not like taps and I would not go for it under any circumstances. Also, Chirrs, may I ask you subjectively what you feel is special in the Mumetal core Sound, besides the fact that the core “sings” loudly.  BTW, doe the Sofwter make amorphous core transformers?

cv wrote:

However, something has occurred to me. The RAAL already has a matching transformer on a small core to which you are cap-coupling; I wonder if Aleks might wind something with a much higher turns ratio and cap couple directly to the 6E5p anode on the S2 amp. Fly in the ointment: he would need to ensure the insulation between windings could handle 400+v. Where the RAAL takes over, the inductance of the S2 should be high enough so the 6E5 isn't loaded down too much. Having said that, do you know what the DCR of the ribbon element is? I have a pair of 90:1 aircores in London designed for driving raw ribbons direct from a SET... there would be some rolloff at 20kHz, but would well be worth trying if I can get hold of them in the next few months...

I certainly considered it and spoke with Alex. Since the amps will be sitting 10” from tweeter then the secondary will not have too high impedance. Alex is wiling to take this project but he needs to do some research and some thinking and he dose not know what might be an ultimate solution. I am planning to send him the amp (a tube with two resistors!!!) and let thin to think himself.  If he come up with one transformer (powder or amorphous) for HF channel then would serve his tweeter the bets then would be it. I like the fact that Alex will be able to think about the problem not in scope of juts a transformer but in composite scope of the entire plate-trans-ribbon interface…

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