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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

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Old 10th Aug 2019, 1:42 pm   #1
FERNSEH
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Default Pre-war Mullard CRTs.

Here is some information about three CRTs made and marketed by Mullard in 1937.
The 12" electrostatic deflection and focus type E46-12 and the 12" and 15" triode gun types M46-12 and M46-15.

DFWB.
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Old 10th Aug 2019, 3:03 pm   #2
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Default Re: Pre-war Mullard CRTs.

Another datasheet of the M46-12 with socket connections. See attachment.

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Old 10th Aug 2019, 4:14 pm   #3
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Default Re: Pre-war Mullard CRTs.

Hello Jac,
Mullard made the tubes but there is no record of any television receiver made in the UK that was equipped with them.

DFWB.
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Old 10th Aug 2019, 4:48 pm   #4
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Default Re: Pre-war Mullard CRTs.

Hello David,

You have a very interesting (valve-)databook there!

Do you know if Mullard developed the MW22-1 or was there input from Eindhoven?

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Old 10th Aug 2019, 5:23 pm   #5
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Default Re: Pre-war Mullard CRTs.

Interesting David. I have an undated Mullard data book which I guess was published in 1938/9. The tubes listed for television are: MW18-2. MW22-1. MW22-3. MW22-5. MW31-3.MW31-6.
The 1936/7 data sheet gives only the E46-12 as suitable for television having a white screen. Seven others are listed. 4001 Green. 4001A Blue. 4002 Green. 4002A Blue. 6001 Green. E42-G6 Green. E42-B6 Blue.
'The E46-12 is designed especially for television reception' [text] John.
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Old 10th Aug 2019, 5:52 pm   #6
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Default Re: Pre-war Mullard CRTs.

I was recently thumbing through some old editions of Television & SWW and came across a piece of trivia that surprised me.

https://www.americanradiohistory.com...8-08-S-OCR.pdf

If you read the Telegossip section it would appear that the monitors in AP of the type here:

https://www.tvcameramuseum.org/emi/e...936/1936p3.htm

initially had green screens!

Peter
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Old 10th Aug 2019, 6:05 pm   #7
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Default Re: Pre-war Mullard CRTs.

Hello Jac,
I'll have to take a look at the MW22-1 in the Pye 838. I seem to remember that it was made in Holland. I reckon it's safe to say that Philips in Eindhoven was the developer of the tube.
I believe that Mullard in England was responsible for the development of the M46-12 and M46-15 CRTs. Both have the B4 base. As for the all electrostatic CRT type E46-12 because it has a side contact connector it's most likely of Continental origin.
Hello John,
the information comes from the Mullard 1937/38 data book. There's all the well known Mullard valves in there and also a few unusual types including two acorn valves types AP4 and AT4. Described as valves for ultra high frequency work. UHF in those times was 300Mc/s I guess.

DFWB.
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Old 10th Aug 2019, 8:26 pm   #8
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Default Re: Pre-war Mullard CRTs.

I seem to remember reading that very early versions of certain pre war EMI receivers had green screens. J.
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Old 10th Aug 2019, 8:50 pm   #9
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Default Re: Pre-war Mullard CRTs.

Hi John,
That's right the Emiscope 9" hexode gun CRT fitted in the HMV 903 and Marconi 704 had the green phosphor.

DFWB.
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