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ml8 wrote:

...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.

Well, I am not thrilled with sound of “opened” 6E5P; I mean with juts fixed bias. It sounded to me too brutal and too aggressive. The “resistor bias”, and partially with a separate “buffered”, soft voltage coursed completely changed the 6E5P sound. Also, the 6E5P is kind off “fast” tube they all have kind of hard sound. The way how we bias the 6E5P make the grid resistor have with miller capacitance a gentile low-pass filter above 100Khz. Still from my point of view the “gas voltage” is the key in the Milq sound. Anyhow, I will try sometimes to get rid the screen lifter or perhaps to put a diode in there… will see what it does.

ml8 wrote:

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.

Hm, you drive 88dB sensitive load with 1.5W buffer? I do not know ml8, it doe not sound credible to me. The fact that it might be “pretty loud” is not really important there are many other things… In fact driving 88dB and 108dB require very different amplification, ever if we disregard power…Anyhow; it is much bigger subject…

http://www.goodsoundclub.com/Forums/ShowPost.aspx?PostID=3688

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