• 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.

Is this an EL34?

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#22
To the OP: don't lose sleep over this: even though the EL34 are rated to 800V for Va & Vg2 max, nobody in his right mind runs them that hard. Most if not all commercial gears run them wisely at 400-500V for about 40-50W output per pair. Even the factory plate curves stop at 450V. Under these conditions, they're no worse nor better than the 6L6GC.
 
#24
Nope, said Mullard (the ones from the UK)
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And, as I said, nobody runs them that hard.
 
#25
This is as surprising as the 2 kV plate voltage rating in the 1st line. But note the (b) remark for both that the Mullard datasheet unfortunately doesn't explain. There are two different voltage ratings in any datasheet that we find at the WWW nowadays. I guess these have been taken from comprehensive tube data books in which we'd find general explanations.

Out of experience and from Valvo and Telefunken databooks that I own I know that the higher values refer to the cold electrodes, i. e. immediately after powering on.

Best regards!
 
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