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Paul S wrote:

Romy, you would probably know this:  I would be interested to know if the ML2's 6AK5 tube is in any way related to feedback in the ML2, because I would guess that it is.  If not, then, I'm wrong (again).

Paul,

the 6AK5 has nothing to do with ML2’s gain stage feedback. Lamm uses 6AK5 as an amplifier in a classic voltage regulator circuit, where the V1 tube (6C33C) used as a voltage facet.

You might go to Steve Bench article about the tube regulators and familiarize yours how it works:
 
http://members.aol.com/sbench/reg1.html

(Go for higher pages)

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