Pro:
- Less switching noise
- Less heatsink
- Looks nicer to tube afficionados
Con:
- Less efficient
- More generated heat
- Higher cost compared to SS
I am also very interested if chosen tube is more abundant, preferably current production, with tube secondary hv rectification. Want to collaborate in parallel build? Let's see your target output voltage and current. I prefer unregulated type for initial build.
- Less switching noise
- Less heatsink
- Looks nicer to tube afficionados
Con:
- Less efficient
- More generated heat
- Higher cost compared to SS
I am also very interested if chosen tube is more abundant, preferably current production, with tube secondary hv rectification. Want to collaborate in parallel build? Let's see your target output voltage and current. I prefer unregulated type for initial build.
We can not discuss non isolated power supply in this forum, we need isolation transformer for buck converter, but it will be bulky and more expensive compared to HF transformer.
My understanding is that a 12V supply will need a boost converter to make HV, not Buck and a tube switch is practically worthless at this low voltage. You need a part capable of switching several Amps.
Tubes can manage to process signals with a 12V supply, or even less (very inefficiently), but processing any power at such a low voltage is going to require enormous wastes to heat a no less enormous cathode, with enormous conduction losses anyway.
If such a need really had existed, special construction tubes might have been developed, but all the low voltage/high current applications of that time used mechanical means: choppers/vibrators, rotary collectors, etc.
If your raw DC input voltage were rectified mains voltage, i.e. ~320 Vdc, thinking about a tube driven SMPS would be more promising by far. But anyway, it would be rather unefficient and yield nothing at all.
Best regards!
Best regards!
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