changing diodes with 5AR4 tubes

trancy · 29th July 2005, 06:25 AM

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

Eli Duttman · 29th July 2005, 06:45 AM

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.

trancy · 29th July 2005, 06:58 AM

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

plovati · 29th July 2005, 08:24 AM

A couple od 3B22.
Same shape of 845, no problem of voltage or current (up to 1A!)

trancy · 29th July 2005, 08:53 AM

yesssssss.....something like that....

question: if voltage goes up thru diode in PSU for 1,41 V, how is with tube "diode"?.....

Hojvaelde · 29th July 2005, 10:33 AM

Quote:

Originally posted by plovati
[B]A couple od 3B22. ][/B

Hmm. My datasheet says PIV is 725 volt for 3B22. To low.

Benny

plovati · 29th July 2005, 10:44 AM

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!

trancy · 29th July 2005, 11:06 AM

so, then 5U4 will be suitable? 2 x ? I can get 5U4.....harder to get 3b22...

lp

trens

Hojvaelde · 29th July 2005, 11:27 AM

Hey

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

Regards

Benny

plovati · 29th July 2005, 03:30 PM

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!

29th July 2005, 06:25 AM	#1
trancy diyAudio Member Join Date: Feb 2004 Location: Slovenia	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 __________________ too much is just enough

29th July 2005, 06:45 AM	#2
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	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. __________________ Eli D.

29th July 2005, 08:24 AM	#4
plovati diyAudio Member Join Date: Mar 2005 Location: near Milan	A couple od 3B22. Same shape of 845, no problem of voltage or current (up to 1A!) __________________ Piergiorgio

29th July 2005, 08:53 AM	#5
trancy diyAudio Member Join Date: Feb 2004 Location: Slovenia	yesssssss.....something like that.... question: if voltage goes up thru diode in PSU for 1,41 V, how is with tube "diode"?..... __________________ too much is just enough

29th July 2005, 10:44 AM	#7
plovati diyAudio Member Join Date: Mar 2005 Location: near Milan	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! __________________ Piergiorgio

29th July 2005, 11:06 AM	#8
trancy diyAudio Member Join Date: Feb 2004 Location: Slovenia	so, then 5U4 will be suitable? 2 x ? I can get 5U4.....harder to get 3b22... lp trens __________________ too much is just enough

29th July 2005, 11:27 AM	#9
Hojvaelde diyAudio Member Join Date: Jan 2005 Location: Denmark	Rectifier tube Hey Try www.ebay.de. I got 4 pcs 1616 (PIV = 5500) for €30 + freght. Regards Benny

29th July 2005, 03:30 PM	#10
plovati diyAudio Member Join Date: Mar 2005 Location: near Milan	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! __________________ Piergiorgio

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