What a day.
I do not have enough time tonight to describe everything I learned today from James Dunlap and Nelson Checkoway.
Despite our lack of technical training, James and I (a) deduced the original tube sequence for the Model R2024 Challenger and, in the process, (b) fixed both our Challenger amps.
Nelson Checkoway refuted several of my working assumptions about (a) the cosmetics of Hilgen amps, (b) the relation between amp models that evolved from one-channel to two-channel versions in general, and (c) the specifications of the Model R2522 Victor amplifier in particular.
I had hoped that the website might work this way, but I had not dared hope it actually would. I am in awe at the generosity, enthusiasm, and technical competence of the folks who are contacting me through the site. I am convinced that, together, we are actually going to solve the mysteries of the great but unsung Hilgen amplifiers and their designer, Jack Gentul. Plus, the story is turning out to be far more intriguing than I would ever have supposed.
Thank you all, my esteemed fellow electro-archaeoligists. More detail tomorrow about the happenings of today.