Mellotronists

According to Keyboard Magazine around 1993 (a feature on Emmo's 
modular Moog restoration) tuning drift was caused by variations in 
the power supply -obviously as everything's voltage controlled. When 
Keith's modular system was fitted with modern stabilised power 
supplies 'the oscillators just went at attention'. Which I presume 
means that they stayed right on the money for tuning.
I'm guessing that the later Minis would have been fitted with a more 
stable PSU, hence the improved tuning.
Anyone want to enlarge or correct me on this?

Best wishes,
Dave.

>
>Sometimes mine is in tune immediately and holds it for hours. Sometimes it
>slips and slides like you wouldn't believe and never settles down. This is
>why I eventually bought a guitar pedal tuner and put it in-line between Mini
>and mixer, using the 'output off when on' jack out so's I can retune on the
>fly. I know the later models (S/N 10,000 and up?) are more stable, but I
>wouldn't swap mine for anything. That's analogue synths for you.
>
>Andy T.