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In the Forum: Melquiades Amplifier
In the Thread: A resistor between screen and grid
Post Subject: No R23? Very Intersting...Posted by Romy the Cat on: 3/24/2007
 ml8 wrote:
That's true that this resistor have negative impact on sound quality.
You can run your 6E5P without it as long as you do not get parazitic oscillation.
Just connect screen grid and plate electrodes right on tube socket, using shortest possible cable.

By the way, i've tried using 6E5P without any biasing -- 100 V on plate, 0 V on grid.
This way 6E5P sounds much better (to say the least) than with any biasing method i was trying (but i didn't tried yours, actually). As long as your source can drive it, you wouldn't get any distortion, but exactly the opposite -- very clean and very live sound.
Thanks, ML8 it would be on my list of the things to try. There are some people who advised me to use diodes in place of R23 - I did nit even tried this over the 2 years… What I observed that 6E5P, as lest some of them, do pick some oscillations as they age, even in my setting, the same 6E6P-DR. They still sound fine but there is this sense of glassy sound…. + the oscillations. I do not have a lot of statistical data about the ageing the 6E5P and oscillations but I have quite a few of 6E5P… Anyhow, when you say that bypassed R23 “has negative impact on sound quality” then could you elaborate what you mean in term of sound? Also, if you do mind then may I ask you what the sensitively of your loudspeakers?

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