• 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.

Triode connected Pentodes in a cathode bias?

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I have a Crate V3112 with 4-el84's. I was thinking about doing this for that amp. I've read that the plate volts can be bad for the screens, but I've measured only about 4 volts difference between them on this amp, so I don't see what the problem is.

I would connect them with the 100 ohm screen resistor in the middle.

What do you think?
 
I have a Crate V3112 with 4-el84's. I was thinking about doing this for that amp. I've read that the plate volts can be bad for the screens, but I've measured only about 4 volts difference between them on this amp, so I don't see what the problem is.

I would connect them with the 100 ohm screen resistor in the middle.

What do you think?

With 100R screen resistors that is fine. Many people have done it. As you point out, there is hardly any difference in voltage in either mode.
 
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