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Old 3rd July 2004, 01:31 PM   #1
diyAudio Member
Join Date: Apr 2004
Location: Monroe Township, NJ
Question Russian 5U4GB

Does anybody have hands on experience with the "recently" introduced Russian 5U4GB? Russian and Chinese 5U4Gs are GUANO. A decent alternative to increasingly scarce NOS is needed badly.
Eli D.
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Old 3rd July 2004, 03:36 PM   #2
markp is offline markp  United States
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Join Date: Oct 2003
Location: L.A., CA
I've also had bad experiences with the Russian and Chinese 5U4s. Voltage? What voltage? They are vastly overrated as far as specs go.
If it sounds good... it is good!
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Old 4th July 2004, 10:02 AM   #3
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Location: Wayne, West Virginia

I haven't had any experience with current production 5U4's but an excellent alternative would be a NOS 5AU4/5V3A. Much better rectifier (higher ratings), readily available and dirt cheap, about $4.70 USD at AES.

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Old 4th July 2004, 08:40 PM   #4
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I just got lucky with this find.
Anything worth trying is worth failing at once or twice.
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Old 4th July 2004, 09:08 PM   #5
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Join Date: Apr 2004
Location: Monroe Township, NJ
Whoever won that auction got a GOOD tube at a nice price. Frazzled, if you won, your 300B project got a boost.

It's very easy to recommend TungSol, RCA, and GE 5U4GBs (in that pecking order). As is the case with many desireable NOS varieties, availability is not too good and prices are rising.

I want to hear from people who have used the Russian 5U4GB. Being able to honestly recommend a current production variety is of importance to me. Sadly, current production 5U4Gs are JUNK.
Eli D.
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Old 4th July 2004, 10:28 PM   #6
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Location: Belgium

Sadly, current production 5U4Gs are JUNK.
Unfortunately I can only confirm that....
From the two "guano" current production mutants the Chinese seems to be the better one.

For any new DIY project the 5U4GB is best avoided, untill the manufacturers get their act together that is.

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