23-09-2017, 03:17 PM
Marconi 702 operating with the frame oscillator adjusted for 25Hz. Although this receiver is possibly a later production model it has the Baird valve and components. Actually, the “Baird” valve might still have a useful function when receiving 405 line test signals with simple sync pulse trains which only have a single broad frame sync pulse.
Geordie McBoyne.
Geordie McBoyne.
