• 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.

SP-14

It will probably increase the voltage a lot. I am confident that the NOS 5y3 are very good! Totally different smoother than 5ar4...

Bronco, you only need to replace the first tube, the second tube is a buffer so rolling it makes no audible difference.

I like the new Tung sol, The n.o.s. are a little upgrade, I had a bargain buying some air force ones that are weird looking, they are nearly as good as the smoked versions, that is what I use because I had many and could find a very closed matched pair.

I was recently tempted to get into the Chinese tubes because they look well made. I don't want the Russian opaque sound or the Chinese sound.