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Fair enough! Do you reckon it could fit in a "floor amp" type of case?

Interesting! The thermistor I wouldn't worry about the remaining resistance really. Frequent in those situations. The 317 heatsink is pretty small tho, I would have tried to fit a bigger one on... Also, when you say 220k/3k9 gives a "classical" 12ax7 response, is it with the same capacitor...

Schaller Hannes Piezzo routing and cable management. If you know, you know.

After a lot of woodchips, I am in the finishing steps of my current build. Funnilly enough, I am now scared of the electronics because of the piezzo that's coming in :D

Doing a LED front panel from your 12V DC is straightforward. Depending on how the standby is wired you could even do a dual Color for standby/on. I went dual Color on my amp for the plexi front depending on the channel I am on. Three LEDs running at 50% of their max power is plenty enough really.

Congrats! Needs some LEDs tho 😁

Is the amp close to an EM source when you play? Computer, monitor etc? From your layout picture, I would say that probably plays a huge role as well. Seems you have your grid stoppers on the pins though so there is that already.

And make sure they area all DPDT on/on/on and a mix of type one and two just for fun.

From what I see from the schematics, there would be too many changes to do it with a single mechanical switch. You would have to build a series of relays to do the changes, and I think there would be some pretty nasty pop even with smart implementation. Probably smarter to try out both...

Could you diagnose where the hum came from before the changes btw? I would say a shielded input to v1 grid stopper is mandatory. Raising the grid stoppers probably did a lot for you there.

I don’t think you can find something off the shelves that is all in one for my specs. Quickly looking at Hammond you could get a 266L14 and a then whatever you like. A 340/50/6.3 is fairly common. You have some flexibility there -330 to 350 will make close to no difference, diffwrent bias...

Yeah, grounding schemes between different regulated DC, elevated, B+ and audio can be hell. I usually go for buses that slowly branch out and are specific for each section and only meet at one point close to general ground. But never dealt with elevated…

Looks great! What are you using the DC for? The Novak and the OP amps?

Sooooo... who goes first? https://forum.pedalpcb.com/forums/amproom/

Blame me - I made the pcb require a 14V supply for DC heaters. Hard to find stock. My next versions will have a 12V Recom exactly for this reason…

I have asked around, and in the US for transformers people mostly use Heyboer and Mercury Magnetic but Sour Sound and Musical Power Supplies were also mentioned.

Been a while since I opened up mine and forgot that I made it intentionally sexy 😁 I hope you had a good and easy time populating. If you saw anything weird let me know in case I do a v2. For the transformer, not sure in the US. I know some people get an off the shelf one and add a secondary...

Well after a bit I decided my VH4 variant clone was feeling and sounding a bit... congested? So I switched the NFB tap from the 8 Ohm to 4 Ohm output. Kind of an interesting change: seems like I am getting a more open sound, a bit more dynamic too. I like it. Then again, holy shit is the NFB...

Of option paralysis you mean 😁

Ouch. Check your voltages of course but maybe look into the NFB? And scope the B+ caps…