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Our MKIII/C is exibiting a problem that has been preplexing
with the following solution recommended by Rank L.A.:
Most visible with the SMPTE "Registration chart" (the one with
horizontal and vertical lines) is a shaking of the horizontal
lines with a scrolling upward of the effect. Rank called this
The problem seems to stem from the 70 volt supply in the scan and
Signal Power Supply as it is a very hummy source of power.
The solution, as recommended by Rank, is to replace the
unregulated 70 volt supply, in the Scan and Signal Power
Supply, with a regulated supply supplying a no hum source
of power to the Line Timebase and EHT power supply cards.
This all sounds correct but before I build such a supply has
anyone found this true and is there a power supply availiable
(what does the Turbo do about this)?