Marconiphone 701A??

[peter scott]

Yesterday Simon Vaughan posted on Facebook a very interesting set of photos taken off the screen of a television in February 1939. We know the date because many of them are scenes from a televised play "The Royal Family of Broadway" that was shown on the 13th of February.

The television set clearly had a passing resemblance to the 701 but was direct viewing. I'm fairly convinced that this set has had the same treatment as the 902 in that the vertically mounted 9" CRT and lens have been replaced by the 12" CRT 6/7 that is short enough to be mounted horizontally for direct viewing as in the 902A and the studio monitors.

   
   

Peter.

[ppppenguin]

The pictures look very good. Underscanned and with good geometry. It does rather look like a direct view CRT, in a set we believe had a mirror and magnifier.

[Panrock]

A fascinating peep into the past. What is the shading on the caption likely to be caused by?

Steve

[peter scott]

I suspect it's a proper picture of tilt and bend.

Peter

[peter scott]

Here's another..

   

[Murphyv310]

Hi.
I've carefully examined the pictures, the resolution is excellent, no visible ringing. I'd not necessarily agree the geometry is perfect with a slight cramping on the right hand of the scan, that and the vertical shift alongside that the horizontal shift must be slightly toward the right makes me think its a magnetically deflected CRT which is leading to the bottom RH corner cutting. Where you notice the cramping is the lettering width.

[Geordie McBoyne]

The first generation of EMI TV sets had no provision for picture shift adjustment. Later on, a "push about" coil (EMI's words) fitted on the CRT neck was made available to facilitate adjustment of picture position. Along with the coil, a potentiometer and bracket were supplied with the modification kit.
Also available for areas subject to severe traffic interference a white spot inverter unit was made available from EMI service. Unit employed an MH4 triode.

Geordie McBoyne.

[Panrock]

Could somebody kindly link to Simon's post on Facebook? Ta.

[Murphyv310]

https://www.facebook.com/simon.vaughan.712

[peter scott]

Could somebody kindly link to Simon's post on Facebook? Ta.

Steve,

That's really cheating! Facebook is meant to be here today gone tomorrow. You are not supposed to look at anything  posted earlier than the day before.

https://www.facebook.com/photo/?fbid=101...4347176044

Be sure to copy and paste the full link and not just the part before the &

Peter