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Old 4th Jan 2021, 1:56 pm   #1
em536716
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Default My newly found Marconi 707

Hey all!

After years of searching, Iíve finally found myself a pre war TV!

Introducing this years restoration project. A Marconi 707!!!

I have asked for advice and guidance on how to proceed with the restoration, but thought Iíd make a separate thread for the actual set. Here it is!
Itís a little tatty, but appears to be all there!

A few months back, someone shared a video from the Land of Lost Content museum, on a Facebook group I am on, in which, was this Marconi 707 I tried my luck and contacted the owner, and after some back and fourth, here it is in my possession!

Attached are some photos, including the serial number. Itís all original apart from 2 smoothing caps which I can see soldered underneath.

The tube has a good heater, as well.

Upon a basic inspection, I have no dc resistance on the mains in side, regardless of how the wave band switch is positioned. The tuning cap doesnít move with the control, or the dial, but string seems intact - perhaps itís slipping, and finally, the volume control appears to be slightly bent.

In a few days I will remove the chassis for a proper clean. And inspect components. Iím putting off doing that, I donít think my back can handle it!

Thanks all
Ed
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Old 4th Jan 2021, 2:02 pm   #2
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Default Re: My newly found Marconi 707

Here are the photos. Also got the complete manual as well!
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Old 4th Jan 2021, 2:18 pm   #3
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Default Re: My newly found Marconi 707

So it's not a 706, it's a 707.

Steve
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Old 4th Jan 2021, 3:46 pm   #4
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Default Re: My newly found Marconi 707

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Originally Posted by Panrock View Post
So it's not a 706, it's a 707.

Steve

Thatís right Steve, I was unaware of the actual screen size as I hadnít seen it in person but corrected myself on the last thread
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Old 4th Jan 2021, 4:42 pm   #5
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Default Re: My newly found Marconi 707

Looks good, I take it that it came with both back & bottom panels?
Chassis looks clean & rust free, always a good sign that it has been stored well.

A couple of replacement parts is to be expected, and the cabinet looks as if it will come up a treat.
I must admit to being rather envious, I have been on the look out for a prewar set for years!


Mark
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Old 4th Jan 2021, 4:43 pm   #6
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Default Re: My newly found Marconi 707

This is my Marconi 707. In 1996 the CRT was rebuilt and with fitted with a new cathode. The work was carried out by Display Electronics Ltd. in Uxbridge.
Googled "Display Electronics Ltd." and it seems according to Companies House records the company was dissolved in December 2016.

DFWB.
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Old 4th Jan 2021, 5:08 pm   #7
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Default Re: My newly found Marconi 707

I like it a lot, the radio dominates (as it should!) and considering there where very few hours of telly in 1936 about right in proportion. Much like today where there are very few hours of watchable TV in a day. I do have a sneaking suspicion that SHMBO would protest if it was our main set.
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Old 4th Jan 2021, 5:11 pm   #8
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Default Re: My newly found Marconi 707

Quote:
Originally Posted by FERNSEH View Post
This is my Marconi 707. In 1996 the CRT was rebuilt and with fitted with a new cathode. The work was carried out by Display Electronics Ltd. in Uxbridge.
Was it re-screened too? If so, how is the ion burn now?

Steve
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Old 4th Jan 2021, 5:20 pm   #9
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Default Re: My newly found Marconi 707

Hi Steve,
I'm sure the tube wasn't rescreened. I do remember there was that problem of making a graded glass seal, Pyrex hard glass to soft glass.

DFWB.
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Old 4th Jan 2021, 5:27 pm   #10
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Default Re: My newly found Marconi 707

Thanks David.

As shown previously, here's the same type of set in the Flanagan & Allen film "Here Comes The Sun". It looks slim may be inset into the "wall".

Steve
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Old 4th Jan 2021, 5:31 pm   #11
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Default Re: My newly found Marconi 707

Looks really interesting great find. Good luck.
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Old 4th Jan 2021, 5:46 pm   #12
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Default Re: My newly found Marconi 707

You lucky so and so!!! I’d love to get my mits on one of those, I’ve only ever seen one in the flesh, it was at the NVCF many years ago, but the telly had been replaced with a modern one! Best of luck with the restoration, it certainly looks like a good set to begin with.

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Old 4th Jan 2021, 7:22 pm   #13
em536716
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Default Re: My newly found Marconi 707

Quote:
Originally Posted by mark pirate View Post
Looks good, I take it that it came with both back & bottom panels?
Chassis looks clean & rust free, always a good sign that it has been stored well.

A couple of replacement parts is to be expected, and the cabinet looks as if it will come up a treat.
I must admit to being rather envious, I have been on the look out for a prewar set for years!


Mark
All there thankfully! And with all screws!

Iím quite nervous too... letís hope itís plain sailing!

Iíve been searching for the past few years. Iím so happy to have found this one
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Old 4th Jan 2021, 7:23 pm   #14
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Default Re: My newly found Marconi 707

Quote:
Originally Posted by FERNSEH View Post
This is my Marconi 707. In 1996 the CRT was rebuilt and with fitted with a new cathode. The work was carried out by Display Electronics Ltd. in Uxbridge.
Googled "Display Electronics Ltd." and it seems according to Companies House records the company was dissolved in December 2016.

DFWB.
What a lovely example!

Hmm, I wonder if itís possible to get the tubes rebuilt still?
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Old 4th Jan 2021, 7:27 pm   #15
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Default Re: My newly found Marconi 707

Thanks all for the positive comments.

Hereís some more photos from the disassembly.

I find it quite amusing to see, the evolution of smoothing caps been added onto and then disconnected still in the chassis lol

The dial appears to be stuck. I think this is to do with dry grease.

Tomorrow eve I will do a slow power up to determine the condition of the Tube, with just EHT supply, without the HT to the rest of it to see if itís possible for it to produce a blob on the tube face.

Iím not optimistic about plugging it in and reforming now Iíve seen the state of smoothing mess. Iíll need to have a think about my next approach.
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Old 4th Jan 2021, 7:28 pm   #16
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Default Re: My newly found Marconi 707

Hereís some more photos
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Old 4th Jan 2021, 8:05 pm   #17
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Default Re: My newly found Marconi 707

em536716 wrote: " Hmm, I wonder if itís possible to get the tubes rebuilt still?"
I believe the Emiscope 3/1 and 3/2 tubes were still available from the EMI service department as late as 1960/61.
Ex Comecon countries CRT 17LK18 can be fitted in these 7" sets. It's been done.
The fact that these pre-war Emiscope tubes were made with Pyrex hard glass might scare off any potential CRT rebuilders.

DFWB.
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Old 4th Jan 2021, 10:17 pm   #18
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Default Re: My newly found Marconi 707

Hi Ed,
That is a great find. You would be unlikely to find an untouched chassis in better condition than that.

Reforming pre-war electrolytics, don't bother I'm sure it won't work and it would probably cause damage anyway.

Looking at your chassis, it looks like it escaped the usual EMI post war overhaul. It still has the bolt on low voltage electrolytics, it also has the original multi capacitor box on the top of the chassis. There is a chance then that the tube may not have had much use.

No, the tubes can't be rebuilt any more as there is no one left to do it. I did indeed fit a Russian tube in my HMV905 as I obtained it with no tube at all.

You were clearly very fortunate to obtain it before today's news. I don't think that picking a vintage TV set constitutes an essential journey, though I have often tried to convince the wife that collecting TVs is an essential part of life!

I wish you will with the testing.

BTW, the tuning has a ball reduction drive, it can get clogged up with dirt.

Cheers
Andy
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Old 4th Jan 2021, 10:39 pm   #19
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Default Re: My newly found Marconi 707

Hi Ed, well done! like everyone else I am quite envious.
I found this picture of your set languishing at the Craven Arms museum suffering the indignity of being surrounded by all that TV merchandise that came decades later, some of it from [whisper]ITV[/whisper]

https://www.tripadvisor.co.uk/Attrac...7&ff=415001066
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Old 5th Jan 2021, 4:13 am   #20
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Default Re: My newly found Marconi 707

Thanks for the encouraging comments guys.

I think itís actually quite comical to see new smoothing caps tacked onto the bottom, then one side cut out then replaced by different ones, which have been disconnected on one side and replaced by even newer ones... almost like you can physically see how long it was in service for.

Yes now Iíve calmed down a bit, reforming the old tired caps arenít as much of a good idea as I might have guessed, although I must admit, I have had luck before after physically heating one of those Metal cylinder Metal cylinder type TCC ones with the holes on top.

Iím sure thereís enough space underneath, to mount RS ones, or better still, restuff what I can.

I took sometime to inspect the DC resistance of the focus coil and scanning coils. All appears well. I removed them and the CRT, gave it all a could clean, being cautious not to wreck the Emiscope label...

My tube appears to have odd rings around the face of the tube. Perhaps this is how they just were back then, seems a little weird to me. Also, Is it right that the face of the tube is right up against the glass? Makes me a little nervous...


Unfortunately a fellow collector friend was going to come up here to Guilford next week and collect the cabinet to restore it for me. Obviously ensuring he preserves all of the original finish as possible, but since we are in lockdown now, I canít see this happening as it isnít safe - Iím too nervous to attempt any cab repair on my own, souly because of its rarity.

The power switch appears to be 2 poles? Appears to be open on both sides unfortunately. I might have to bypass this for testing purposes when I run it up on the variac later this week.


Light dusting and cleaning, checking of IF coils, and TXs is a priority at the mo.

Thank you Rambo1152 for sharing this. The owner of the museum, Stella, was given the TV set by her husband Dave, for their first Christmas together. That was 35 years ago. It was a very sentimental part of her collection and was hard to part with it. Iíve promised to put it back to its former glory for her, and enjoy it as much as possible.
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