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

RE: Listening to my New Korneff Clone 45 SET Amps .................

I understand that. I am asking what do you do to keep the bass out of the 45 SET amplifier?

Even though you have a passive crossover keeping the bass out of the horn, if you don't do something to keep the bass out of the 45 SET amplifier the load line for the mids and highs will follow an elliptical load line because of the presents of the bass. No gapped output transformer has enough inductance to properly deal with low bass frequencies. This leads to distortion of all the frequencies.

Try this, add your best .015uf capacitor in series with the 100k input impedance of the 45 amplifier. I like the Russian Silver mica caps.

This will create a 6db high pass filter at about 100Hz and greatly improve that amplifiers performance in the mids and highs without changing your 270Hz crossover point. The load line for the mids and the highs will become much more "resistive" leading to less harmonic distortion.

Voltsecond did a study of inductance and elliptical load lines and made the very point I am trying to share with you.

Have Fun and Enjoy the Music
"Still Working the Problem"

Edits: 03/27/21

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