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Old 8th March 2012, 08:32 AM   #71
AJT is offline AJT  Philippines
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^1meg resistors shunted with each diode will do, you are merely ensuring equal voltage divisions, current is no problem since you are operating reversed bias....
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Old 8th March 2012, 08:37 AM   #72
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ok! thanks
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Old 9th March 2012, 08:53 AM   #73
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Old 9th March 2012, 05:24 PM   #74
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This will be truly spectacular. Unknown mercury rectifiers blooming under 1.5A current and 2.5A @ 50v 33r load 10nf Cap single wave





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next find will be a mercury pool rectifier.....
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Old 13th March 2012, 04:15 PM   #75
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I am going to machine my own caps:

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3x4x40cm rod made of teflon..

last piece (had to clean it thoroughly). I paid it 10 euros

(yes it's teflon. The weight is correct)
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Old 22nd March 2012, 12:34 PM   #76
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To increase HV efficiency, the transformer will require bridges. with gas rectifiers that can be accomplished either with tube based design or using a hybrid solution. I prepared a board to accomodate the "half bridge" required for hybrid operation. The common bus goes to main PWR ground.
The two relays above are soldered in parallel so that both will close upon power on. The main switch will not power the filament transformers to avoid sparks/damage. It will power a sall supp,ementary transformer which will in turn power on all the transformers and driver stage bias (-12v).

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Old 22nd March 2012, 12:34 PM   #77
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don't mind the small lead on the faston connector...it just stuck there from the rectifier board assembly.
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Old 22nd March 2012, 02:28 PM   #78
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Quote:
Originally Posted by Alexontherocks View Post
I actually equalised the resistors with 2w 100k resistors just after posting the first photos...


what I don't know exactly is how to balance the diodes. 400k resistors in parallel?
I think capacitors are much better for reverse voltage balancing and snubbing at the same time. 10nF@3KV and the big one is 10nF@6KV
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Old 22nd March 2012, 02:39 PM   #79
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thanks for the suggestion!
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Old 22nd March 2012, 02:55 PM   #80
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I really hope the tube/diode bridge works well...I don't have space of power for an all tube based bridge.
The again a 2500VA transformer with 0 taps would have required a 4900VA core!
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