• 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.

Video pentodes as outputs

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mondogenerator

mondogenerator

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Joined 2009
wa2ise said:
Normally this tube isn't all that linear in pentode mode, so triode mode improves it. But oddly enough, inserting a 5K screen resistor into the triode wired mode makes it more linear yet..
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Hi,

I've seen something similar in the Phillips datasheet.

Something like 9k Ra, Vs at 150V, grid at 100V for an AF amplifier. From the little I know the pentode lines are so so, the triode looks very nonlinear.

I'm considering trying some of the arrangements found on TubeCAD site, specifically a pentode follower, out of mere curiosity.
 
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