Muddy Valve ID - UK Vintage Radio Repair and Restoration Discussion Forum

Uncle Bulgaria · 25th Sep 2022, 10:54 pm

I was walking the other day and saw a rusty valve chassis down the bank immersed in the mire. A bit of slithering found a strange mix of corrugated iron that was perhaps once a shed with a car in, and I retrieved this remarkably sealed-looking valve. Some kind of magic eye?

Radio Wrangler · 25th Sep 2022, 11:19 pm

Octal base, coke bottle, round eye... EM34?

second thoughts, weren't EM34 cylindrical bottles? So Y63, then.

David

lesmw0sec · 26th Sep 2022, 9:59 am

Possibly from a junked R1155?

turretslug · 26th Sep 2022, 5:57 pm

Y63 is probably the best known and most popular of shouldered-bottle, IO-based magic eyes, so quite likely- if you're lucky, it might even have some of that classic green glow left in it.

Leon Crampin · 27th Sep 2022, 12:49 pm

Y63. EM34s always had an asymmetrically split triode anode to drive the two sections of the display with differing sensitivities. They were also all in tubular envelopes. The connections also differ, with the grid and target pins transposed.

Leon.

HamishBoxer · 27th Sep 2022, 1:57 pm

6e5 ?

ms660 · 27th Sep 2022, 3:03 pm

The valve pins are a giveaway two thick 'uns so far as I know (UX6) the 6E5GT's were octal.

VI103, CV1103 were also equivalents for the Y63.

The R1155 receiver was fitted with the VI103.

Lawrence.

HamishBoxer · 27th Sep 2022, 3:59 pm

Correct Lawrence!

Uncle Bulgaria · 27th Sep 2022, 5:25 pm

The VI103 looks very promising. It looks just like the reference photograph and the Radiomuseum dimensions are closer for that than for the Y63, which is slightly bigger. If it's from an R1155 then that's handy as I have one awaiting restoration! It doesn't look like it's gone to air so perhaps it will even work... Perhaps I'd better stroll down where I found it again and see if there's more archaelogy to be done.

It's not clear in my photographs that there is no pin six, which I just noticed. This supports VI103 as the datasheet mentions this pin is omitted.

What marvellous detectives you all are! Thank you.

25th Sep 2022, 10:54 pm	#1
Uncle Bulgaria Nonode Join Date: May 2016 Location: Cornwall, UK. Posts: 2,334	Muddy Valve ID I was walking the other day and saw a rusty valve chassis down the bank immersed in the mire. A bit of slithering found a strange mix of corrugated iron that was perhaps once a shed with a car in, and I retrieved this remarkably sealed-looking valve. Some kind of magic eye? Attached Thumbnails

25th Sep 2022, 11:19 pm	#2
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,872	Re: Muddy Valve ID Octal base, coke bottle, round eye... EM34? second thoughts, weren't EM34 cylindrical bottles? So Y63, then. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

26th Sep 2022, 9:59 am	#3
lesmw0sec Octode Join Date: Jul 2009 Location: Carmel, Llannerchymedd, Anglesey, UK. Posts: 1,507	Re: Muddy Valve ID Possibly from a junked R1155?

26th Sep 2022, 5:57 pm	#4
turretslug Dekatron Join Date: Nov 2011 Location: Surrey, UK. Posts: 4,395	Re: Muddy Valve ID Y63 is probably the best known and most popular of shouldered-bottle, IO-based magic eyes, so quite likely- if you're lucky, it might even have some of that classic green glow left in it.

27th Sep 2022, 12:49 pm	#5
Leon Crampin Octode Join Date: Nov 2005 Location: Surrey, UK. Posts: 1,870	Re: Muddy Valve ID Y63. EM34s always had an asymmetrically split triode anode to drive the two sections of the display with differing sensitivities. They were also all in tubular envelopes. The connections also differ, with the grid and target pins transposed. Leon.

27th Sep 2022, 1:57 pm	#6
HamishBoxer Dekatron Join Date: Aug 2007 Location: W.Butterwick, near Doncaster UK. Posts: 8,932	Re: Muddy Valve ID 6e5 ? __________________ G8JET BVWS Archivist and Member V.M.A.R.S

27th Sep 2022, 3:03 pm	#7
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Muddy Valve ID The valve pins are a giveaway two thick 'uns so far as I know (UX6) the 6E5GT's were octal. VI103, CV1103 were also equivalents for the Y63. The R1155 receiver was fitted with the VI103. Lawrence.

27th Sep 2022, 3:59 pm	#8
HamishBoxer Dekatron Join Date: Aug 2007 Location: W.Butterwick, near Doncaster UK. Posts: 8,932	Re: Muddy Valve ID Correct Lawrence! __________________ G8JET BVWS Archivist and Member V.M.A.R.S

27th Sep 2022, 5:25 pm	#9
Uncle Bulgaria Nonode Join Date: May 2016 Location: Cornwall, UK. Posts: 2,334	Re: Muddy Valve ID The VI103 looks very promising. It looks just like the reference photograph and the Radiomuseum dimensions are closer for that than for the Y63, which is slightly bigger. If it's from an R1155 then that's handy as I have one awaiting restoration! It doesn't look like it's gone to air so perhaps it will even work... Perhaps I'd better stroll down where I found it again and see if there's more archaelogy to be done. It's not clear in my photographs that there is no pin six, which I just noticed. This supports VI103 as the datasheet mentions this pin is omitted. What marvellous detectives you all are! Thank you.