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In the Forum: Melquiades Amplifier
In the Thread: A resistor between screen and grid
Post Subject: Can't describe it exactly...Posted by ml8 on: 3/24/2007
...but resistor between screen grid and plate, to my hearing, makes sound slightly unnatural, especially in highs.
But this may be not true in your case (i didn't try to use this resistor with 6E5P, only with other power tetrodes), so i think i'll suggest you first try it and listen, and then you can make decision about do you need it at all.
And about your question... actually, i'm no audiophille by any means, as i have pretty crappy speakers (around ~88 dB, two-way bass reflex) and i'm usibg PC as a source 
But still, when i run 6E5P without any biasing (actually there is small bias voltage, which appears on grid leak resistor), sound became much more natural and i thing i can understand now what are you talking about when you're describing the sound of Melquiades.
But i'm using just a single cascade with 6E5P as an amplifier -- no poweramp.
Still, it can be pretty loud when i'm want it to be, even with my dumb speakers.
So sometimes i just wonder why do you need 6C33C at all, with your high-sensitive speakers.
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