line preamp using 6SN7 instead of 12AU7 - Page 2 - diyAudio
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Old 23rd May 2007, 02:12 AM   #11
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Yes, that did occur to me and I refered to that in my post . However the V2 grid is at ground potential and so there is no way that the cathode could also be at zero volts . So it still looks like it ( - V ) wasn't required ...........isn't it ?

The direct coupled stage is simpler and does the job very well. Is there any sonic improvement in the scheme that is shown with 3 supplies ?
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Old 23rd May 2007, 12:05 PM   #12
ilimzn is offline ilimzn  Croatia
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Quote:
Originally posted by EC8010
A 6SN7 cathode follower could operate from the +250V rail (losing the +125V rail). The more significant problem (which others have highlighted) is that the first stage has too much gain; 12B4A (mu = 6) would make more sense.
Note that there is local feedback in the first tsage lowering it's gain.
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