Greinacher multiplier psu for tube amp

Hello i was reading some information about greinacher cascade multiplier, and thought that if it is possible i can use it in my tube amps and preamps, because it can save me huge costs (replacing hv transformer with lower voltage and greater amperage)

Is it possible ? should i need special capacitors ? electrolytic or not ? special or typical diode ie 1n4007 ?

input voltage 12v 100va
target output 250v to 300v/100ma

my friend is 1n4007 a cap or a diode

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each has its own limitation and advantage higher current the cables used have higher power withholding nature and so you will need a higher amperage wire which pushes your cost

losses become significant in high current

if they are okay you can proceed with your project

typo error! 1n4007 is diode!

i ask if i need special parts for that purpose, or if you know and can suggest some specific parts.

about significant losses at high voltage, is it possible to use schotky barriers ? (i think they have lower losses)
can it deliver 100ma @ 300v ?

1. You don't need special components.
2. The design idea makes no sense because the capacitors (about 20 x 20000µF) required for a 50 Hz multiplier with the intended specification need more room than a 50 VA transformer. 1N4007 isn't sufficient for the input current.

The article linked below lists the basic multipliers, with advantages and disadvantages.

The parallel types are better at providing high current.

Your schematic is the half-wave series multiplier. Also known as the Villard style because it is based on the Villard cell.

Notice all of its supply current must come in through a single capacitor. So it is better suited to provide low current. 100 mA is reasonable.

https://www.voltagemultipliers.com/html/multcircuit.html

I have several Youtube videos showing the inner workings of voltage multipliers, as animated simulations. Including:

The Greinacher or bridge doubler

www.youtube.com/watch?v=qTS26qfGa30

Half-wave parallel multiplier

https://www.youtube.com/watch?v=1waNmvNrbYw

Three voltage triplers

https://www.youtube.com/watch?v=KXppi0_b3NY

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To get 300 VDC you can run 120 VAC through a doubler.

Capacitors will acquire different charge levels, depending on the type of multiplier.

You can use electrolytics, same as you would typically use for an ordinary power supply. You must test as to which polarity develops on the wires. If you use a parallel multiplier then notice each stage requires increasingly greater volt rating.

Typically your diodes must withstand 2.8x your nominal incoming AC. You can use 400V rating for 120VAC.

Diode amp rating should be what you would use in an ordinary power supply.

FvM said:

1. You don't need special components.
2. The design idea makes no sense because the capacitors (about 20 x 20000µF) required for a 50 Hz multiplier with the intended specification need more room than a 50 VA transformer. 1N4007 isn't sufficient for the input current.

Click to expand...

Wow, i didnt knew that i should use so huge capacitors.
If i cant avoid that sigificant cost, i will scrap the whole idea