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In Reply to: 6DJ8 or 12AT7 posted by jimdandy on February 21, 2007 at 07:38:55:
the long tailed pair. 12AT7 has amplification factor of around 60
as I recall, and 6DJ8 is only around 30. Go with the 12AT7 for
the invertor. If you are attempting to drive output tubes which
use grid resitors much lower than around, say, 330K, then I'd
consider using a buffer stage between the driver and the power
tube. A 5687 is a good choice for buffer, and yes, 6SN7 works too.
If you are using EL84 tubes for output, or cathode-bias EL34, then
you could use either the 12AT7 or even possibly better a 12AX7
long-tailed invertor with no buffer needed --AS LONG AS: you will
be operating the ouyput tubes mostly in class-A, AND you are NOT
using grid resistors for your power tubes of less than 470K.
I'd use 470K grid-R's for EL34s, and 1Meg for the EL84. Again,
the values I give presume cathode biased output stages operating
mostly in class-A (triode or ultralinear mode both okay).What kind of output tubes and config are you contemplating?
-T.M.
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Follow Ups
- Higher Mu tubes balance better in.. - Thomas Martens 16:28:46 02/21/07 (3)
- Re: Higher Mu tubes balance better in.. - jimdandy 16:42:06 02/21/07 (2)
- Then you'll want a buffer stage for... - Thomas Martens 17:09:33 02/21/07 (0)
- Re: Higher Mu tubes balance better in.. - Eli Duttman 16:58:13 02/21/07 (0)
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