• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Russian 5U4GB

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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.
 
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