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Old 20th April 2009, 04:35 PM   #1
MiiB is offline MiiB  Denmark
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Default Tube rectifiede +- supply...

Hi I would like to make a Tube rectified LC +- supply does anyome have a basic shematic to workfrom...
I especially interested to gain knowledge of rectifier tubes is there any that in a single package supports +- supplies...

The intention is to make a supply for a poweramplifer input and VaS stages.. app +-50V at 10 mA..

thanks Michael
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Old 21st April 2009, 12:22 AM   #2
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Michael,

You are in luck. For the low voltage and small current you indicated, the 6JU8 quad diode will work. As for a schematic, other than using vacuum diodes in the bridge, follow the commonplace pattern of a CT rectifier winding and bridge rectifier.

What sort of filter do you have in mind, Π section or choke I/P?
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Old 21st April 2009, 07:23 AM   #3
MiiB is offline MiiB  Denmark
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Thanks Eli....

I have mis read.. my sims...
I need app 40 miliamps at +- 50 V per channel
That is in total a little less tha 100 mA wit a little overhead
So the suggested tube is not sufficient as I can see that it will only manage about 10 mA...

I'll have to finde more powerfull diodes... I'll use the LC.. filter style...

The main reason for this idea is to avoid the Hf switching residuals...from solid state diodes....

Main question is how to couple the rectifer tubes to a center tapped R-core to create a +- supply wit common gnd...?
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Old 22nd April 2009, 01:03 AM   #4
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Well, if that's all you're worried about use Schottky diodes

Or, you could always properly damp the resonant circuit and stop the oscillation dead(RC snubber). You would have to be able to measure leakage inductance, though. Don't use vacuum as a crutch.

I'd better get out of here before the lynch mob finds me.
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Old 22nd April 2009, 02:30 AM   #5
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SpreadSpectrum is correct. Schottky diodes are every bit as quiet as vacuum diodes and make the construction of the bipolar PSU really easy.

4 diodes in 1 bottle is not exactly commonplace. You could build the bridge from a pair of twin discrete diodes. Possible types are the 6BY5 and 117Z6.

BTW, if you combine SS rectification with choke I/P filtration, make certain to install a protective snubber cap. or MOV. Inductive kick back spikes can easily destroy SS diodes.
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