Mellotron Update

[jc]

In mellotron 400's and Mk5's the playback heads go straight to a preamp
circuit, I would start there ... in 400's you have one channel of signal
and so you only need to probe along one line ... if there's no signal
coming ot of the preamp check the power supply lines to make sure they are
both alive at the preamp end ... the first versions of the Mellotron have
notoriously bad power supply circuits and tacho circuits on the motor ...
in the mk5 that I helped build I junked the original power supply save for
the tranny and installed a diode bridge, filter caps and good regulators as
a simple but sturdy supply to the audio circuits ... hope this helps a bit
... Mellotrons 4ever!!!

www.lynx.bc.ca/~jc

>Well people, I told you before about the Mellotron I happened to
>stumble across. I've got it running now, that is, the tapes and
>mechanics are fully operational. But there's no sound at all! I've
>checked the wiring etc. Any thoughts on what typical-Mellotronic
>electronic failure could cause this?
>
>Bye,
>
>Jeroen
>
>
>
>
>--> Brun, met een dakje op de u.
>
>Nu ook op http://www.bart.nl/~brun/index.htm