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In Reply to: RE: Received my new M-60s today. posted by jeffreybehr on April 13, 2016 at 17:33:18
Unless I'm mistaken, Ralph is liking the idea of a solid state constant current source. There are a great many plus'. Though I can't remember what they are?.
The biggest advantage, and this is huge, it frees up a 6SN7. Your M60 now has two input tubes, like the MA-1, I think?.
If I'm not mistaken, this drops distortion to really low levels.
It still has four front-end 6SN7s, and AFAIK, they're configured the same way as they were in the Mk.IIs.
Tin-eared audiofool, large-scale-Classical music lover, and damned-amateur fotografer.
William Bruce Cameron: "...not everything that can be counted counts, and not everything that counts can be counted."
I've been trying to think?
If the CCS is now solid state, what would Ralph use that spare tube for?
I looked closely at your 'inards' picture.
If you look closely, the signal wire from the XLR connection goes to a tag strip.
From there the signal goes through two input resistors. These are attached to V2.
There are two wires which connect those two input points to V4, also input points.
If someone else could look at the picture, that would be much appreciated.
If someone else could look
The MA2s that I repaired years ago had paralleled tubes for the bottom part of the cascode diff. So it looks like the two side tubes are the lower part of the cascode, the middle tube is the upper part of the cascode, and the front tube is the cathode follower/driver tube.
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