What a gorgeous set of cups
Thanks, Joe, looking forward to getting them, should be soon.
Sorry I haven't been updating here, very busy at work, won't let up any time soon. Going to try and finish this other Airmid over the weekend. Will be picking up my Klipsch speakers on Monday, then will finalize plans of the metal grills and order materials. When I've had time, I've been playing with the idea of building a high-power amplifier (by my standards). Just ideas at the moment, poring over schematics, building sims, etc. If I do it, will go one of two different directions.
A) Triode push-pull class A design using 6336 or 6528.
B) Solid state single-ended class A design using the THF-51S V-FETs.
My girlfriend uses the stereo in my bedroom often, and truth be told, the 1.5W that 45 amplifier is putting out isn't ideal for the 90dB/W Klipsch KG1s I have up there. For low-level listening it's fine, but she has admitted it would be nice to turn it up now and then, and the low-end performance would benefit. I want to rebuild that 45 amplifier, so in theory this high-power design would replace it while I do the rebuild.
Think I still have a pair of 6336 around here for option A. With two sections per tube, would only need a pair. Design would go input gain stage > long-tailed pair > 6528 / 6336. For the input stage, gain requirements would be low without using NFB, but could either use a high-gain triode or pentode input and play with adding some GNFB.
Option B is a little more approachable as I have a functional schematic for a THF-51S power amplifier, still need to work on the power supply. It would either need a preamp stage to make it an integrated or be paired with a dedicated preamp. Messing with solid state preamp stages this morning, but could also throw together a simple tube pre. My power amplifier design as it stands right now (in simulation) can do something like 40W at less than 1% THD.
So anyway, that's sort of what I've been working on in the background, making some plans. Will post some pics of the bronze Airmid when I finish it.