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Pinch of salt with the 6-figure comment btw - I'd been drinking :D
For a small amp it's difficult to beat a single-ended class A build based on an EF86 and EL84, so either a Mullard 3-3 or BBC AM8/2A. I've not found anyone making a PCB for either of those, so you have to build them point-to point. An ECC83 / EL84 combo will be as good and there are plenty of PCBs for that circuit if you want a simpler build. You can then modify your component values to suit the amp you want to build. There are a plethora of new, NOS British and NOS Soviet valves to choose from.
For a bigger amp, consider the Tubelab SSE which can use a single EL34, KT66, KT88 or wouldn't be too difficult to reconfigure to a 300B. The circuit board is incredibly high quality, well spaced out and has gold plated tracks.
Fundamentally though, a push-pull setup is inherently less noisy than SE, develops more power and (technically) cancels out its own distortion without having to run a lot of negative feedback. It doesn't need anywhere near as much care with HT smoothing, DC heaters or heater wire routing.
For transformers, Hammond and Edcor are well respected. If you're in the UK, there's also Primary Windings. I've used theirs on my AM8/2A build and they're excellent transformers.
Obviously remember you'll be working with dangerously high voltages
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Jonny69
I'm curious what the good options are in the space - will probably never do it but would like to have a look anyway!
I've done a fair amount of putting together synth modules, imagine this might be a bit more complicated/treacherous?