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Re: not to belabor the obvious, but...

On an MA-1 Mk.II, the driver tube is closest to the edge of the chassis, on the same side as the power tubes. On an M-60 Mk.II.3, it is the tube furthest from the front of the amp.

While this tube *is* in the signal path, it's generally known that it tends to have less effect on sonics than other tubes in the circuit. I have heard a report (from an MA-2 owner) that at least one version of Tung-Sol tubes do not work correctly in this location; that they make the amplifier sound 'broken'. While this is curious and questionable, I thought I would pass it along - so that others can draw their own conclusions.

The CCS tube (constant current source) sources current for the voltage amplifier. Again, it is not directly in the signal path, but the quality and stability of the tube do affect the nature of the DC power fed to the voltage amp. A lower-priority tube, but significant in its own way.

Hope this helps,
ML


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