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Old 29th July 2005, 06:25 AM   #1
trancy is offline trancy  Slovenia
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Default changing diodes with 5AR4 tubes

heloo

I am new in tube PSU design, and I want to change diodes in attached link to schematic with 5AR4 or similar tube. Could someone draw me how to do that...




lp

trens

PSU schematic
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Old 29th July 2005, 06:45 AM   #2
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Look before you leap. The 1300 VAC CT exceeds the PIV rating of the 5AR4. So, you can't use a 5AR4.
5AR4 Data Sheet

You could use a pair of damper diodes to replace the SS diodes. Be aware that the forward drop in vacuum rectifiers is greater than that of SS. You will also need additional heater power.

Oh yeah, plates are anodes (SS triangles) and cathodes are cathodes (SS bars). The SS diode symbol indicates the direction of conventional current flow.
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Old 29th July 2005, 06:58 AM   #3
trancy is offline trancy  Slovenia
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Quote:
Originally posted by Eli Duttman
The 1300 VAC CT exceeds the PIV rating of the 5AR4. So, you can't use a 5AR4.

o.k. then some other rectifier tube .... I told that I am new in tube PSU

lp

trens
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Old 29th July 2005, 08:24 AM   #4
plovati is offline plovati  Italy
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A couple od 3B22.
Same shape of 845, no problem of voltage or current (up to 1A!)
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Old 29th July 2005, 08:53 AM   #5
trancy is offline trancy  Slovenia
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yesssssss.....something like that....

question: if voltage goes up thru diode in PSU for 1,41 V, how is with tube "diode"?.....
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Old 29th July 2005, 10:33 AM   #6
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Quote:
Originally posted by plovati
[B]A couple od 3B22. ][/B
Hmm. My datasheet says PIV is 725 volt for 3B22. To low.

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Old 29th July 2005, 10:44 AM   #7
plovati is offline plovati  Italy
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Ach..
so, You need 4 3B22s..
What happen in a tube diode if the PIV is exceeded, arcing? In case of 3B22 it seems difficult, the electrodes are well separated.

5U4 PIV is 1550, one of the highest thru common tubes.

Otherwise... a simple cheap silicon rectifier!
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Old 29th July 2005, 11:06 AM   #8
trancy is offline trancy  Slovenia
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so, then 5U4 will be suitable? 2 x ? I can get 5U4.....harder to get 3b22...

lp

trens
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Old 29th July 2005, 11:27 AM   #9
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Default Rectifier tube

Hey

Try www.ebay.de. I got 4 pcs 1616 (PIV = 5500) for 30 + freght.


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Old 29th July 2005, 03:30 PM   #10
plovati is offline plovati  Italy
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3B22s are not so hard to find:
http://www.thetubestore.com/cetron3b22.html
it can be uses by a series of diodes and 3B22.

Or, from the same family, 3B25, rectifies up to 1400V dc

http://www.tubedepot.com/nos-3b25.html

Big amplifier, big rectifier!
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