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FERNSEH · 22nd Apr 2018, 11:31 am

"If another ECC82 needs to be employed to act as an inverter or anything else, that wouldn't be the end of the world. After all, I'm already fitting one for the black level clamp so two is not much extra effort!"
Hi Nick,
One of the triode sections of the 6/30L2 is diode connected, it can be replaced with a solid state device thus leaving the triode free for other duties such as a pulse inverter and shaper.
The difficulty is generating keying pulse for the vision AGC, easy enough if we are willing to fill the chassis up with many more valves and components but we must follow the rules of domestic TV construction, which is as it always has been "do it on the cheap".

DFWB.

22nd Apr 2018, 11:31 am	#8
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: DC Restoration questions "If another ECC82 needs to be employed to act as an inverter or anything else, that wouldn't be the end of the world. After all, I'm already fitting one for the black level clamp so two is not much extra effort!" Hi Nick, One of the triode sections of the 6/30L2 is diode connected, it can be replaced with a solid state device thus leaving the triode free for other duties such as a pulse inverter and shaper. The difficulty is generating keying pulse for the vision AGC, easy enough if we are willing to fill the chassis up with many more valves and components but we must follow the rules of domestic TV construction, which is as it always has been "do it on the cheap". DFWB.