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Old 31st Dec 2021, 10:40 pm   #12
FERNSEH
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Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Hedgehog MK2 405 Line Converter

Hi Bob,
I'm delighted you are pleased with the Ultra"53" TV set.
The set was featured in a topic about incorporating a black level clamp circuit in a basic TV set.
Eventually, it was found in order to do the job properly, the video DC restoration modification required another valve, a 6/30L2 double triode.
The Hedghog converter is an excellent device. My Mark 1 converter has been in constant operation for more than two years now. It has never been switched off!
One can watch 405 on the largest possible set, be it 23 or 24" CRT receiver or a 4 X 3 foot screen projection set. Compare the converted images with similar size 625 receiver, and, apart from the more evident line structure, there no loss of picture detail. Broadcast quality I'd say.

DFWB.
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