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Old 19th Dec 2019, 11:24 am   #21
Gridiron
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Default Re: Vintage Mullard Oscilloscope

The phase inversion for the Y amp comes from the common cathode resistor for the first pair of EF36's, the input signal going to the control grid of the top EF36, the lower grid being connected to earth.
Mike.
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Old 19th Dec 2019, 11:28 am   #22
turretslug
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Default Re: Vintage Mullard Oscilloscope

One grid of the input pair is grounded and they share a common cathode resistor, generating complimentary anode swings into the next stage.

Crossed with Mike! Colin
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Old 19th Dec 2019, 1:41 pm   #23
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Default Re: Vintage Mullard Oscilloscope

Duh! Yes obvious now. I needed another coffee to get the brain in gear.

D
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Old 21st Nov 2020, 8:29 pm   #24
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Default Vintage Mullard Scope Working

Hey thanks to those who put up links and info for the Mullard oscilloscope, I've got it working!

73s

Ian G6TVJ
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Old 21st Nov 2020, 9:11 pm   #25
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Default Re: Vintage Mullard Scope Working

Is that Mullard? The motive on the front looks to me like MI, or Marconi instruments. Just a guess, you may be completely correct (and therefore me - completely incorrect)!
Les.
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Old 21st Nov 2020, 9:29 pm   #26
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Default Re: Vintage Mullard Scope Working

MI.I think too.
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Old 21st Nov 2020, 9:35 pm   #27
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Default Re: Vintage Mullard Oscilloscope

Threads merged.
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Old 21st Nov 2020, 9:42 pm   #28
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Smile Re: Vintage Mullard Oscilloscope

Good evening,
It looks very Philips like to me. It is similar in appearance with the oscilloscope in the "secret writing of the electron" on one of the BVWS DVD's where all of the Y amplifier EF36 valves are in a line along the chassis on the R/H side viewed from the front, each with a screened top cap on.

Christopher Capener
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Old 21st Nov 2020, 10:54 pm   #29
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Default Re: Vintage Mullard Oscilloscope

Interesting, if one looks at the first post of this now merged thread, there is a few pictures one with a plate saying it is a Mullard E800. which probably with Mullard becoming a wholly owned subsidiary of Philips Electrical Industries Limited explains why it looks like a Philips scope. I did not realise that Philips owned Mullard from 1927!

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Old 22nd Nov 2020, 8:35 am   #30
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Default Re: Vintage Mullard Oscilloscope

The "Motif" on the front that Les mentioned [post 25*] looks to me like Mullard with a CRT symbol on top but I suppose it could be interpreted as M I. Even then, there is no apparent evidence for Marconi but an easy enough assumption I suppose.

Dave

Last edited by Cobaltblue; 22nd Nov 2020 at 9:53 am. Reason: Stay on topic
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Old 22nd Nov 2020, 3:43 pm   #31
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Default Re: Vintage Mullard Oscilloscope

Another ghost from the machine: https://picclick.co.uk/Vintage-Mulla...083987512.html
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Old 22nd Nov 2020, 8:45 pm   #32
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Default Re: Vintage Mullard Oscilloscope

Seeing that link convinces me to withdraw my suggestion unequivocally.
Mullard (plus CRT) it is.
Les.
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Old Yesterday, 3:49 am   #33
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Default Re: Vintage Mullard Oscilloscope

The one that Bill refers to is now in my collection, I've got 2, this one had all but the two voltage regulator valves removed as they are hard to get to, and had the time base EC50 Thyratron replaced with 2 "hard" valves of indeterminate type.

I also have another similar looking one which also has no valves & any model or type badges have been removed, internally its not quite the same layout but seems of a similar age, all on the "to-do" list of course.
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