Vintage rear projection sets

[Duke Nukem]

I remember now. The miller-transitron oscillator relies on the screen and anode currents being antiphase - see this load of drivel.

So that 'Franty cct doesn't make sense again. Time for a think.

Yeah, treated with respect I don't see projection sets as any worse than a colour set and still safer than mains EHT. You can also simply disconnect HT from the EHT generator whilst getting the rest of the set functioning and testing the CRT protection circuits prior to applying EHT.

TTFN,
Jon

[OldTickTock]

Mark,

I guess you have Trader 1118 & 1119 which describes in detail the Optical and E.H.T units. When you get around to your restoration if you want, I can scan a further document you may not have .

It is a technical communication from Mullard dated 1954, it would appear from a stamp on the back to have come from the Ferranti library based in Edinburgh, in particular from their Electrical & General Engineering section, it is stamped on the back "This document it should be returned to library", I guess an engineer failed to do so.

The document is by John Crouch & Brian Overton from Mullard research laboratoires, it details the improved generator for the 25kV E.H.T supply to projection picture tube MW6-2.

Chris

[Duke Nukem]

@OldTickTock, would appreciate a scan of that Mullard article if possible, it'd complement some other projection stuff I've put on-line or am about to put up (I've scanned the Mullard "Installing and Maintaining Projection Television" book that I got at the last Wotton Bassett, it just needs, erm, "PDFication").

TTFN,
Jon

[OldTickTock]

Hi Jon,

No problem will be a pleasure, when I have a spare moment I will put it in our service section & pm you when it's done.

Chris

[Duke Nukem]

Thanks!

Would appreciate some actual scans (switch off any auto-sharpening - ask if you want to be bored rigid as to the reason why) if possible.

Anyhow, as there was smeg-all on the box tonight (like tonight was any different to most nights?) I've PDFerised the Installing and Maintaining Projection Televisions booklet. Second item down via this link.

TTFN,
Jon

[Mark R]

Obliged Jon

cheers Mark