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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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19th Dec 2019, 11:24 am | #21 |
Heptode
Join Date: Apr 2010
Location: West Midlands, UK.
Posts: 663
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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. |
19th Dec 2019, 11:28 am | #22 |
Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,397
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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 |
19th Dec 2019, 1:41 pm | #23 |
Octode
Join Date: Nov 2004
Location: Hebden Bridge, West Yorkshire, UK.
Posts: 1,885
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Re: Vintage Mullard Oscilloscope
Duh! Yes obvious now. I needed another coffee to get the brain in gear.
D |
21st Nov 2020, 8:29 pm | #24 |
Triode
Join Date: Sep 2014
Location: Bristol, UK.
Posts: 25
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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 |
21st Nov 2020, 9:11 pm | #25 |
Nonode
Join Date: Dec 2012
Location: Kirk Michael, Isle of Man
Posts: 2,350
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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. |
21st Nov 2020, 9:29 pm | #26 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,935
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Re: Vintage Mullard Scope Working
MI.I think too.
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G8JET BVWS Archivist and Member V.M.A.R.S |
21st Nov 2020, 9:35 pm | #27 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,642
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Re: Vintage Mullard Oscilloscope
Threads merged.
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21st Nov 2020, 9:42 pm | #28 |
Octode
Join Date: May 2003
Location: Belper Derbyshire
Posts: 1,936
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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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Interests in the collection and restoration of Tefifon players and 405 line television |
21st Nov 2020, 10:54 pm | #29 |
Octode
Join Date: Mar 2020
Location: Blackburn with Darwen, Lancashire, UK.
Posts: 1,572
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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!
Adrian |
22nd Nov 2020, 8:35 am | #30 |
Dekatron
Join Date: Jan 2006
Location: Ramsbottom (Nr Bury) Lancs or Bexhill (Nr Hastings) Sussex.
Posts: 5,817
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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 |
22nd Nov 2020, 3:43 pm | #31 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,642
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Re: Vintage Mullard Oscilloscope
Another ghost from the machine: https://picclick.co.uk/Vintage-Mulla...083987512.html
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22nd Nov 2020, 8:45 pm | #32 |
Nonode
Join Date: Dec 2012
Location: Kirk Michael, Isle of Man
Posts: 2,350
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Re: Vintage Mullard Oscilloscope
Seeing that link convinces me to withdraw my suggestion unequivocally.
Mullard (plus CRT) it is. Les. |
23rd Nov 2020, 3:49 am | #33 |
Triode
Join Date: Jan 2011
Location: Bradford, West Yorkshire, UK.
Posts: 44
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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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Bear2Biker |