PYE 731 CHASSIS – VCR OPERATION

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I’m having difficulty using this set with a VCR (Sony C5).
There’s a lot of line tearing, more on prerecorded tapes,
and the tracking control has no effect.

The 731 was the first Pye solid-state chassis and used an
SN76544N07 line/field timebase oscillator i.c. mounted on
a sub panel: it’s not an ideal chassis for use with a VCR.

The flywheel line sync filter components are connected
to pin 7 of the i.c.: try reducing the value of C516 from
0.022µ,F to 0.01µF and C516 from 10µ,F to 4.7µF. Some
experimentation with the values of these capacitors may
be necessary to strike a good compromise between VCR
and off -air performance.

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