Got an old Murphy MC6301 CTV set, (Rank Z718C chassis) with power supply
problems.

First can anyone tell me roughly when these were produced.

Second, anyone have circuit info for the power supply section? Main cap
ratings now obscured, and the choke / transformer configuration is not
obvious. The degauss posistor & rectifiers are all OK.

--
Paul

"Paul" wrote in message
...
Got an old Murphy MC6301 CTV set, (Rank Z718C chassis) with power supply
problems.

First can anyone tell me roughly when these were produced.

Second, anyone have circuit info for the power supply section? Main cap
ratings now obscured, and the choke / transformer configuration is not
obvious. The degauss posistor & rectifiers are all OK.

--
Paul

I used to have a circuit for one of these, I will have a look for for it -
although I fear that it is now lost. As far as I can recall, these were
produced in the late seventies, early eighties, and I worked on a lot of
them - but I can't remember too much about them now. I do recall that they
had a strange start-up circuit - which was a bit 'chicken and egg' - and you
could make an important test by overriding it with a resistor (I think 47k).