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[Closed] Recreating the GEC 8161 Mirror Lid TV

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Brian Cuff: The "Pre-War" TV Master; Memorial Archive

Last Post by Cathovisor 8 years ago

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Marc

(@marc)

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Excellent result Catho :aad
and no doubt a heck of a relief too :bba

Marc.

Marc
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RSGB call sign 2E0VTN

Posted : 04/09/2016 6:08 pm

Brian Cuff

(@briancuff)

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Topic starter

That really is excellent news Cathy. The BT8161 will be so much better with a proper monochrome picture. It will be interesting to see whether the deflection sensitivity is greater for that tube although its reduced length suggests otherwise!

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Posted : 04/09/2016 7:07 pm

Cathovisor

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That really is excellent news Cathy. The BT8161 will be so much better with a proper monochrome picture. It will be interesting to see whether the deflection sensitivity is greater for that tube although its reduced length suggests otherwise!

You've no idea how much of a sigh of relief I made when I saw the meter rapidly increase its count, I can tell you!

I have a copy of the manual for the BT9121 which uses the 4603 CRT, and that seems to use a broadly similar scanning circuit to the BT8161.

What I may do is buy one of those £20 (or so) oscilloscope modules from China from eBay and run it up with my x100 probe attached and a battery to power it, so I can happily float the thing up to EHT and look at the deflection plate waveforms directly. At £20, it can be treated as disposable should a flash-over annihilate it!

Posted : 04/09/2016 8:09 pm

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