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FERNSEH · 23rd Apr 2015, 6:10 pm

Waveform of the integrated frame pulses on the anode of the MSP4 frame sync separator valve. The frame sync pulse amplitude is 100volts P-P. The 100 volt negative going underswing is in fact the flyback pulse reflected back from the blocking oscillator trnsformer. I'll compare these with the waveforms of the Marconi 702. That set has much better frame hold.

DFWB.

23rd Apr 2015, 6:10 pm	#9
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: HMV 901 restoration. Waveform of the integrated frame pulses on the anode of the MSP4 frame sync separator valve. The frame sync pulse amplitude is 100volts P-P. The 100 volt negative going underswing is in fact the flyback pulse reflected back from the blocking oscillator trnsformer. I'll compare these with the waveforms of the Marconi 702. That set has much better frame hold. DFWB. Attached Thumbnails