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Old 20th Nov 2017, 12:05 pm   #21
mojojojo
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Default Re: Marconi 272 skip find

Thanks everyone for all the comments !

I'm beginning to wade through all the information and hoping that with your help, it won't be long before all its valves are aglow again!!

I have to say that I'm struck by Geoff's' comments about keeping its patina and this is probably the way I'm going to go.

That said the thought that it could be a 00001, with the 06 a model prefix actually frightens me !

It would be a bit too important, for an amateur like myself, to be let loose on it

charlie
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Old 20th Nov 2017, 1:03 pm   #22
turretslug
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Default Re: Marconi 272 skip find

How awful that someone just skipped it. Looks essentially complete, including valves, and the silvery effect ("gettering") visible on a couple of them suggests that they are still viable too. As mentioned, an interesting evolutionary stage in radio development that will still give good results more than 80 years on- but something this old will take diligence and care in overhaul. There's plenty of appropriate good advice to be found from forum members. Good luck with it.
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Old 20th Nov 2017, 8:29 pm   #23
crusher19860138
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Default Re: Marconi 272 skip find

The most important piece of advice i would give is not to simply plug it in and hope it works!
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Old 20th Nov 2017, 9:02 pm   #24
ukcol
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Default Re: Marconi 272 skip find

Hi Charlie

On a slightly negative note, I hadn't spotted earlier that this is one of the sets from the EMI* stable that uses a capacitor block. This is a box containing a dozen or so capacitors and then filled with black pitch. This was a deliberate ploy by EMI to discourage non-EMI dealers and DIY repair men from repairing their sets.

The implication here and now is that replacing the capacitors in the block is a relatively challenging job for a "newbee". You may be well advised to find a forum member in your part of the world who can do the chassis restoration for you or at least rebuild the capacitor block for you.

*EMI = Electrical & Musical Industries, they manufactured and distributed radios etc under the Columbia, HMV & Marconi names.
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Old 21st Nov 2017, 9:37 am   #25
mojojojo
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Default Re: Marconi 272 skip find

Was just reading about the capacitor block in the link posted earlier. Have now removed the chassis and speaker but will decide later on whether I need professional help !!!! Need to do more reading. But in the meantime am taking a mimimalist approach to the cabinet. Veneer to clamp back down
and glue, new perspex dial screen, speaker cloth and lots of head scratching.

Charlie
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Old 21st Nov 2017, 10:32 pm   #26
yestertech
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Default Re: Marconi 272 skip find

here's a small insight into Marconi numbering, in this case from my data on set type 911
( small bakelite job with the chassis mounted upside down )

911 A/5 7262
911 9057
911 9451
911 a/4 100946
911 a/4 103154
911 G4 ? 103676
911 104300
911 A/4 104350
911 a/4 106762
911 109021
911 111677
911 A/4 116702
911 117664
13 38.88% 16719

Whilst one doesn't know the starting number, it does appear that the numbering is consecutive, ( some sort of 'reset' seems to have been done after 9999 ) and in this case its possible that over 16000 were made !

Andy
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Old 21st Nov 2017, 10:52 pm   #27
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Default Re: Marconi 272 skip find

Here's one that someone overhauled earlier:

https://www.youtube.com/watch?v=glHttGGxvQ0
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Old 23rd Nov 2017, 3:01 pm   #28
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Default Re: Marconi 272 skip find

If that isn't inspiring enough to restore it, pitch block included, nothing is!
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Old 27th Nov 2017, 11:26 am   #29
mojojojo
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Default Re: Marconi 272 skip find



Quote:
Originally Posted by yestertech View Post
here's a small insight into Marconi numbering, in this case from my data on set type 911 ...

Whilst one doesn't know the starting number, it does appear that the numbering is consecutive, ( some sort of 'reset' seems to have been done after 9999 ) and in this case its possible that over 16000 were made !
I can see the logical sequences you refer to and as revealing as they are I am trying to apply them to my 272.

Now, does this point to my radio being one of 60,000 made, which is of course a very likely possibility or its the outside chance of it being 00001 of a 06 series?

The only thing I can deduce ( in a poor Sherlock Holmes moment ) that there are no numbers beginning with a 0 prefix in your list, which doesn't really help given the other comments over the vagaries of serial numbering in general.

The only other 272 I can find are on Radiomuseum site and have e mailed them in hope of getting the other serial numbers sent to me in an attempt to solve this mystery !!

charlie
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