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Television Standards Converters, Modulators etc Standards converters, modulators anything else for providing signals to vintage televisions.

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Old 30th Dec 2021, 5:35 pm   #1
bobhowe
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Default Hedgehog MK2 405 Line Converter

Hi a belated Christmas present from my lovely Wife a Hedgehog MK2 405 Line Converter from Stephen Evans ( Thank You Jeffery Borinsky for email link ) David Boynes is kindly going to try it on one of his TV sets for me as i have not got a 405 line TV yet will report findings soon hear is a picture od the converter
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Old 30th Dec 2021, 6:30 pm   #2
Lloyd 1985
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Default Re: Hedgehog MK2 405 Line Converter

You will not be disappointed! These are great little converters, I built 2 of the Mk1 versions a while back, picture is excellent through these.

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Old 30th Dec 2021, 7:11 pm   #3
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Default Re: Hedgehog MK2 405 Line Converter

Thanks Lloyd you are right
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Old 30th Dec 2021, 7:22 pm   #4
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Default Re: Hedgehog MK2 405 Line Converter

Hi.
As one of the original testers of the MK1 I can confirm that they are brilliant.
I now have a Hedghog Dual and PSC. Both are not only excellent but also extremely good value.
So Bob you've bought furniture before the house?
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Old 30th Dec 2021, 7:33 pm   #5
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Default Re: Hedgehog MK2 405 Line Converter

Hi thanks Trevor yes I bought the furniture before the house
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Last edited by Cobaltblue; 30th Dec 2021 at 7:57 pm. Reason: Off Topic without going Off Topic
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Old 30th Dec 2021, 7:47 pm   #6
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Default Re: Hedgehog MK2 405 Line Converter

Looking forward to going to davids shop and seeing the Hedgehog Converter working
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Old 30th Dec 2021, 9:13 pm   #7
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Default Re: Hedgehog MK2 405 Line Converter

Hi Bob, you won't be disappointed, i built the mk2 and Freya of this forum kindly programmed it for me, it's a super little device.
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Old 30th Dec 2021, 10:06 pm   #8
Lloyd 1985
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Default Re: Hedgehog MK2 405 Line Converter

Heres a little spoiler!! This was the first test of mine once Id finally finished building them, you can see them both lying naked on the bench!

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Lloyd
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Old 31st Dec 2021, 12:33 pm   #9
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Default Re: Hedgehog MK2 405 Line Converter

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Originally Posted by Lloyd 1985 View Post
Here’s a little spoiler!! This was the first test of mine once I’d finally finished building them, you can see them both lying naked on the bench!

Regards
Lloyd
Hi Lloyd looks a big job in building them with a lot of SMD components going to Davids shop this afternoon to try my converter
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Old 31st Dec 2021, 6:22 pm   #10
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Default Re: Hedgehog MK2 405 Line Converter

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Heres a little spoiler!! This was the first test of mine once Id finally finished building them, you can see them both lying naked on the bench!
Ah, the Hedghog 1, those were the days when half the work was already done with a plug in FPGA board.
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Old 31st Dec 2021, 8:36 pm   #11
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Default Re: Hedgehog MK2 405 Line Converter

Been to Davids shop today and tried the converter what a good piece of kit and David has kindly donated to me an Ultra V17-53 in perfect working order with a excellent bright CRT David originally was using the set to see if a black clamp would work at high video levels at the CRT cathodes .Perhaps David could explain about it here is a picture of the test card of the Hedgehog converter on the Ultra V17-53 kind regards Bob
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Old 31st Dec 2021, 9:40 pm   #12
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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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Old 31st Dec 2021, 9:55 pm   #13
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Default Re: Hedgehog MK2 405 Line Converter

Hi David very pleased with the set and converter great combination looking forward to seeing some live pictures very soon
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Old 31st Dec 2021, 9:59 pm   #14
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Default Re: Hedgehog MK2 405 Line Converter

Nice telly and a great picture! Enjoy

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Old 31st Dec 2021, 10:42 pm   #15
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Default Re: Hedgehog MK2 405 Line Converter

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Nice telly and a great picture! Enjoy

Regards
Lloyd
Thanks Lloyd I am very pleased more to follow soon very happy and relaxing for the 2022 count down all the best
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