• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

250 watts from a SE OTL OCL 300B Amplifier!!!

I heard it several times in italy and in germany and IMHO this amp is unremarkable. Plus it is 50k euro.
It sounds very solid state-ish. Might as well be listening to some CHprecision ss amp. Together with some multiway tower and you get my least favorite audio system. 😉
 
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If you don't have the SET OT you don't get the 3rd harmonic, and if the tubes aren't loaded down you don't get the 2nd harmonic. So it sounds like a SS Amp. They fixed everything "wrong" with a SET.. Output Z is probably too low too.
 
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Interesting to hear that my observation about SS sound could be attributed to the high NFB and low output impedance!
I never thought about a unity gain follower as having 100% NFB and sounding very SS because of it!
Something else I didn't like about this amp are these two massive caps per channel. I was convinced they are series dc blocking or some type of bias bypass caps, (same difference). I was attributing the flat SS sound to those.