View Single Post
Old 20th May 2018, 5:28 pm   #68
FERNSEH
Dekatron
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Kolster Brandes RV 10 (Crown)

"I have -45 volts on the grid/pin 2 of the PL81." That's about the right figure. The sawtooth drive waveform supplied to the grid of the line output valve is typically 100 volts. As the waveform is AC coupled to the valve, conduction takes place on the latter part of the scan. The valve functions as a switch. The first part of the scan is derived from the reclaimed energy in the scan coils.

DFWB.
FERNSEH is offline