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In Reply to: RE: Has anyone tried these 12au7's yet? posted by Michael Samra on June 10, 2012 at 20:10:25
Hi Mike,
Based on the number of posts on the subject over the years, you've been a pretty big advocate of the VTA boards for Dynaco equipment. Have you converted that circuit to use the 6CG7?
The 12AT7 VTA circuit offers too much gain, and the 12AU7, well, what Timbo said!
I'm trying to sort out what I'm going to do with these Dynaco MkIII's I just awoke from a twenty something year slumber.
Follow Ups:
I have converted that circuit to 12au7s and from there I have scraped and moved the filament wires.The dyna mk3s are not too bad with the 12at7s.You need to remove that bypass 47uf on the cathode of the input stage...I would use one 12at7 and one 6cg7 to experiment tho.
When problems become increasingly difficult,we can always rely on our collective knowledge and seek relief.
Too often IME 12AT7s are quite steely in tone.
NB it doesn't HAVE to be a 6072 hand-selected for super quiet, and rolled on a virgin's thighs, maate. It's not a microphone amplifier now is it?!
Basic 12AY7, should have enough gain and you can probably use less NFB, which can't hurt.
Note that a post in response is preferred.
Warmest
Timothy Bailey
The Skyptical Mensurer and Audio Scrounger
And gladly would he learn and gladly teach - Chaucer. ;-)!
'Still not saluting.'
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