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Author Topic: Needed Suggestion for Diode Replacement Please.  (Read 3521 times)
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ka3zlr
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« on: May 20, 2008, 08:49:09 AM »
Good Morning,

 On the Viker II What would be the Best Diodes for the HV and LV supplies...I want to take the Power supplies Outboard like Ken Did and Rack mount this with the 813 machine...Also The supplies will be variable need ones that will take a Pounding...

Much obliged OM's...
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WA1GFZ
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« Reply #1 on: May 20, 2008, 09:39:06 AM »
I used 1N4007s. 5 per leg in the HV and two per leg in the LV 1 per leg in the bias. gfz
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W1AEX
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« Reply #2 on: May 20, 2008, 12:50:18 PM »
I did the same as Frank, IN4007 strings of 5 in each leg of the HV. As I recall, I built them up in some broken tube bases so they could just be plugged into the existing tube sockets. I used 1N4007's in the LV as well. Never had a failure with either setup. My Viker's HV is on a variac and it never complained with any power settings I randomly supplied with a twist of the variac.

I rack mounted my Viking (One) and found the chassis to be plenty stiff enough to handle it, even with the power supply components present. I did have to extend brace arms from the top of the rack to the back of the chassis to hold it all together without strain. You can see where they are bolted through the rack panel where the white arrows are pointing in the attached photo. It's a pretty good dead lift when you remove it and put it back in place though!

Rob W1AEX

* Viking One support Arms.jpg (19.39 KB, 331x458 - viewed 351 times.)
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WA1GFZ
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« Reply #3 on: May 20, 2008, 02:43:52 PM »
I mounted a hunk of perf board in a tube base for the HV to mount the 10 diodes.
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ka3zlr
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« Reply #4 on: May 21, 2008, 04:26:41 AM »
I am much obliged Gents thank you, the new Variacs I ordered arrived yesterday, and i'm getten busy here. Rob Nice pic on yer Machine...Nice Build...
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KB2WIG
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« Reply #5 on: May 21, 2008, 10:07:06 AM »
I like to use 1N5408's... they are rated at 3 amp, 1kV. The extra few amps are nice  for the initial current inrush.  $8.80 / 100  at Mouser

klc
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The Slab Bacon
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« Reply #6 on: May 21, 2008, 01:15:54 PM »
Quote from: KB2WIG on May 21, 2008, 10:07:06 AM
I like to use 1N5408's... they are rated at 3 amp, 1kV. The extra few amps are nice  for the initial current inrush.  $8.80 / 100  at Mouser

klc

I totally agree with Kevin!! I use 5408's for all B+ and HV applications. 4000 series diodes are too fragile. they short if you look at them hard. Use 4000 series diodes for biass and low voltage control circuits, bit use real diodes for the "workhorse" applications.

                                                             the Slab Bacon
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ka3zlr
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« Reply #7 on: May 21, 2008, 07:55:55 PM »
oooK, welp I guess i got my werk cutout for me...Not a problem...TNX..
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