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Stamford 27th Feb 2020 8:39 pm

Equipment Identification Help.
2 Attachment(s)
If anyone could help me identify this unit that I,ve pictured,I would be very grateful.
Rank-Bush-Murphy with a serial plate on the rear with the model number MR 773 MK4.

Any info most appreciated...cheers

kan_turk 28th Feb 2020 12:44 pm

Re: Equipment Identification Help.
This is, as it says on the serial plate, a Rank Bush Murphy MR773 Mk 4 monochrome 625 line tv picture monitor from I would say, at a guess, the late 60s or early 70s

This monitor accepted two composite video inputs (switchable) and a single (optional) external sync input

All inputs were ‘loop through’ allowing signals to be extended to other equipment if required (or terminated in 75ohms if not)

This was the standard configuration for analogue video

Hope that this clarifies a little bit - sorry but further info has not survived in my ‘archive´ ��

Rgds John

rambo1152 28th Feb 2020 4:59 pm

Re: Equipment Identification Help.
Most likely to have seen service motioning a CCTV security camera or two.
A little unusual in having separate sync inputs, I imagine the video inputs could cope with composite, but I'm not totally sure.

turretslug 28th Feb 2020 5:27 pm

Re: Equipment Identification Help.
There's a front-panel switch to choose between internal and external sync options for the two video inputs. Separate sync was a pretty standard option for quality monitors- I don't know whether this is a "broadcast" grade monitor with its implication of high video bandwidth, scanning linearity and decent black-level clamping but there are a handful of members here whose speciality is vintage TV broadcast installations- hopefully, they will look in and be able to pass judgement. It may be a somewhat rare survivor.


kan_turk 28th Feb 2020 8:20 pm

Re: Equipment Identification Help.
Definitely primarily a broadcast monitor with composite video inputs - possibly grade 2 used for indicative viewing rather than technical evaluation - I just can’t remember - it is a long time since I played with one of these

Stamford 29th Feb 2020 4:57 am

Re: Equipment Identification Help.
Thanks guys... helpful as ever.

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