Last round of PCBs

One more round of PCBs. Should have everything in the pipeline now for the 4P1L headphone amp, plus some test options for the driver tube, maybe do a shootout between all the little russian tubes.

I’ve designed the PCBs so they are modular and can be used stand-alone on a test board, or become part of an amplifier. They are not very consistent in size of surface area efficiency, but they are very flexible in testing out different tubes/voltages etc. This will allow me to use directly- and indirectly heated tubes by just changing out the regulator PCB from voltage to current (Colemand), and the B+ boards have 500Vdc rated film caps for a broad selection of tubes and operation points.

Once I have tested the amp to see if it works (iffy) and I am content (never!), I will most likely make new PCB’s to hold all the parts on a single board to save space and maybe use some better components; pretty much everything is sourced from Farnell/RS/Conrad at the moment.



Filament Filtered (supply chassis, C plus common-mode choke)
B+ Raw (supply chassis, rectifier and first CLC)
B+ Filtered (signal chassis, RCRC for two voltages)
Filament dual Low-Drop (370mV) Regulator 3A (for indirectly heated tubes)



Filament Raw+Tranny (supply chassis, pcb transformer, rectifier and CLC,)
Filament Raw (supply chassis, rectifier and CLC)
6E6P Noval, but turned so I look straight into the filament
6S19S Noval, turned to look head-on into the filament, yes, still with wrong text 6S19P 🙁

And one I don’t have a screeny of: 4P1L Octal also turned to look into the filament. We like shineys!

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