17-06-2017, 07:02 PM
An interlace filter circuit must be reinstated into the receiver. Rather than the Pye two diode circuit favoured by the engineer who did all those modifications I'm returning frame sync circuit back to the original EMI design consisting of one half of a D63/6H6 double-diode. See first attachment. In order to give the other diode section of V8 something to do a sync pulse clipper will be introduced into the anode circuit of the sync separator valve. This is part of the sync separation circuit of the later model 1806. See the second attachment. Only two extra components are required, R48 and C36.
The third attachment shows the two diode interlace circuit employed in the Pilot CV34. The Pye FV1 uses a similar circuit.
Geordie McBoyne.
The third attachment shows the two diode interlace circuit employed in the Pilot CV34. The Pye FV1 uses a similar circuit.
Geordie McBoyne.
