I'm contemplating building a 12AE6A based Millet Hybrid MiniMax Preamp found here:
MAX Schematic
It would be built as a monoblock, however.
I have a nice 50/60hz power transformer with 115v Primaries and 10v secondaries @ 2A and It's center tapped. It would be great to be able to use it 🙂
I ran this Cockroft-Walton full wave voltage multiplier in the Falstad simulator and it runs very nicely at ~26.18vdc average, with no load. My computer won't handle the full schematic in the simulator.
Cockroft-Walton full wave voltage multiplier (please excuse the drawing):
0 | Transformer: 50/60hz 115vac primaries 10-0-10vac seconda… | Flickr
I have some LM317T voltage regulators that can be used.
How feasable would this power supply be for the preamp?
Thank you in advance.
MAX Schematic
It would be built as a monoblock, however.
I have a nice 50/60hz power transformer with 115v Primaries and 10v secondaries @ 2A and It's center tapped. It would be great to be able to use it 🙂
I ran this Cockroft-Walton full wave voltage multiplier in the Falstad simulator and it runs very nicely at ~26.18vdc average, with no load. My computer won't handle the full schematic in the simulator.
Cockroft-Walton full wave voltage multiplier (please excuse the drawing):
0 | Transformer: 50/60hz 115vac primaries 10-0-10vac seconda… | Flickr
I have some LM317T voltage regulators that can be used.
How feasable would this power supply be for the preamp?
Thank you in advance.
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Hi Gypsy,
If it may be useful I recentely built a more minimal hybrid schematic going through a voltage doubler for B+ and it worked nicely.
I'd recommend to use a two capacitors of 470uF at least (1000uF are better) for the doubling part, as to have no problem with ripple and too low current output. I needed only few mA, but I think it's possible to get easily up to some dozen mA, if the transformer supports al least 4-5x the current demand.
If it may be useful I recentely built a more minimal hybrid schematic going through a voltage doubler for B+ and it worked nicely.
I'd recommend to use a two capacitors of 470uF at least (1000uF are better) for the doubling part, as to have no problem with ripple and too low current output. I needed only few mA, but I think it's possible to get easily up to some dozen mA, if the transformer supports al least 4-5x the current demand.
Hey Indaco,
Thank you for your reply. I actually have some 470uf 35v Capacitors that should work 😉 I removed C7, C8, C9, C10, C11, C12and R2 from the Schematic and increased the Capacitors to 470uf. It runs much better in the simulator now. I put a 2.2uf filter capacitor in line on the dc output. I'm gatting an average of 28.20vdc with no load. I think it should run very well with the LM317 regulator. I don't mind a little 50/60hz noise, it just adds to the charm of a tube based device IMO.
Thank you for your reply. I actually have some 470uf 35v Capacitors that should work 😉 I removed C7, C8, C9, C10, C11, C12and R2 from the Schematic and increased the Capacitors to 470uf. It runs much better in the simulator now. I put a 2.2uf filter capacitor in line on the dc output. I'm gatting an average of 28.20vdc with no load. I think it should run very well with the LM317 regulator. I don't mind a little 50/60hz noise, it just adds to the charm of a tube based device IMO.