Vintage Mullard Oscilloscope

[wattlessdropper]

Hi I have a Mullard oscilloscope I wonder if anyone has a circuit diagram and or a manual of any kind? Many Thanks Ian G6TVJ

Love the handle.

[barrymagrec]

It looks rather like one my Dad had many years ago although rather more complete (ie yours has a tube) He attempted to find information without sucess and he was working at Mullards Mitcham at the time.

Side contact valves?

Good luck.

[M0FYA Andy]

Side contact valves would make it a real rarity.

[turretslug]

There's something oddly Gothic about that tube bezel, as if it was off the Addams Family set. Maybe Uncle Fester has one in his basement workshop.

[ms660]

The GM.3156 had a similar front panel layout:

https://www.americanradiohistory.com...rch=%22mullard measuring apparatus%22

Lawrence.

I am wondering just how much research/development work this old 'scope has seen. Probably too expensive for general repair work.

[ms660]

Ref. the Philips GM3156 I posted earlier, here's a link to a manual for the GM3156-01 if it's any use to anyone:

https://frank.pocnet.net/instruments...6-01_sd_en.pdf

Lawrence.

[Gridiron]

Circuit and information from Quarrington Radio Circuits and Data attached.
Mike.

[Ed_Dinning]

Looks like a nice functional design, and I think it is the same tube used in the HSVT.

Ed

[dave cox]

I think I had one of those for a while !

A row of 'metal can' valves, with locking ring, inside ?

dc

EDIT EF50's or something similar looking

[wattlessdropper]

Thanks for info! The scope has been broggled I may put it back to original with thyratron timebase etc. It's not in bad condition for its age.

[Alistair D]

Originally Posted by Gridiron

Circuit and information from Quarrington Radio Circuits and Data attached.
Mike.

I tried searching for Quarrington Radio on the net but could not find anything related to electronics. Can you post a link?

Al

[stevehertz]

Originally Posted by Gridiron

Circuit and information from Quarrington Radio Circuits and Data attached.
Mike.

In that description I notice it says:

"..two external sockets, K14 and K15, are at a potential of 1,250 volts with respect to earth."

Very nice.

[Wellington]

Al, (I hope Mike (Gridiron) doesn't mind me jumping in, here) "Radio Circuits and Data" appears to be a book by C.A. Quarrington.

I couldn't find out much about him on the 'net, but he crops ups on this forum. First names: Cecil Albert, according to this thread.

Interestingly, and I don't know if it's the same chap, a Cecil Albert George Quarrington appears in The London Gazette in 1939, right above someone called Francis Peto Dudley Scott. I wonder if he had anything to do with Peto Scott Electrical Instruments?

[Wellington]

Originally Posted by wattlessdropper

The scope has been broggled…

Ian, what does 'broggled' mean? It's a word I haven't encountered before!

[Alistair D]

Originally Posted by Wellington

Al, (I hope Mike (Gridiron) doesn't mind me jumping in, here) "Radio Circuits and Data" appears to be a book by C.A. Quarrington.

I couldn't find out much about him on the 'net, but he crops ups on this forum. First names: Cecil Albert, according to this thread.

Interestingly, and I don't know if it's the same chap, a Cecil Albert George Quarrington appears in The London Gazette in 1939, right above someone called Francis Peto Dudley Scott. I wonder if he had anything to do with Peto Scott Electrical Instruments?

Got it thanks.

Al

[TowerRadio]

I have a manual for the GM3156 you can have.The circuit seems identical to the one for the E800 but it lists a possibly diff.crt and it has 2 neon stabilisers.Valve lineup seems the same.possible wartime printing. it says "Instructions" on the cover but there is a circuit,chassis layout and components list. 11 pages. Les

[Gridiron]

Yes, the circuits are scans from the book by C.A.Quarrington, first published in 1948 which includes a selection of circuits of radios of the period, useful circuits and circuits of some test gear, formulae and data and valve equivalents and base connections.
The author states that the book is complementary to his "Modern Practical Radio and Television" which I believe is in 3 volumes, I only have "Radio Circuits and Data" which I was given many years ago by a work colleague.
Mike.

[dominicbeesley]

I may be being incredibly thick but it looks to me like the top part of the circuit should be driving the Y plates in opposite phase but I can't see where the phase inversion for either half happens it all looks to be in-phase to me?

D