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Old 4th July 2007, 07:26 AM   #11
corne is offline corne  Netherlands
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With Kevin's solution the 900V B+ jumps first to 450V and then if the 6AU4 diodes are warm it goes to 900V at the same time the 400V will be available.

A delayed start of both voltages can be achieved by placing a diode between the transformer centre tab and the 4Hc hoke (anode to centre tab and cathode to choke) on the 400V B+.
This diode will also prevent the capacitors on the 400V B+ to be negatively charged.

Corne
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Old 10th July 2007, 11:54 AM   #12
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Gentlemen,
Thanks SO much for all of your help. The finished product is shown here:

Click the image to open in full size.

I am working on getting the chokes wound...Once they arrive then I should be able to breadboard the circuit and report back on a verification that this thing works as needed.

Thanks again,
Steve
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Old 11th July 2007, 12:00 AM   #13
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Steve,

You need a 10 nF. HIGH WVDC ceramic cap. between the 1N4007's cathode and ground. The cap. protects the SS diode from inductive kick back spikes. You do show a choke I/P filter.
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