Marconi valve - UK Vintage Radio Repair and Restoration Discussion Forum

blackcat · 27th Dec 2015, 7:26 pm

Hello forum.

You can probably tell I'm new to radios by my question. I have recently acquired a Marconi Z14 1N5G DF33 valve and have tried to find a catalogue of some (any) sort online. The only reference I have found are a couple for sale.

Can any one please direct me to some information? I dont even know what years they were made-and which radios used them.

Thank you in anticipation!

Jonathon.

Station X · 27th Dec 2015, 7:35 pm

I'm not sure what information you're seeking, but this is a good starting point:-

http://www.r-type.org/exhib/aac0058.htm

HamishBoxer · 27th Dec 2015, 8:02 pm

These were used in battery portables.The make of which I cannot at present remember Marconi or Ever Ready?
1940's.

blackcat · 27th Dec 2015, 8:27 pm

Thats a very good start thank you---they changed the number!

Peter.N. · 28th Dec 2015, 12:03 am

A DF33 is an RF pentode with an octal base and 1.4 volt filament, I suspect the others are equivalents.

Peter

kalee20 · 28th Dec 2015, 10:36 am

Yes - Z14 is a GEC-Osram type of number, 1N5G an American number, and DF33 a British/European number. All for the same equivalent valve, a pentode on an Octal base, with 1.4V filament.

blackcat · 28th Dec 2015, 11:54 am

I seem to have a new old stock Z14 so I m trying to find a radio to fit it!
Even if I don't succeed it's a very nice ornament and didn't cost much. Certainly looks unused.
I wonder if there is a way of rectifying down to 90 volts without using expensive batteries.

AC/HL · 28th Dec 2015, 12:07 pm

It's usual to do things the other way round, but someone will doubtless know of one.
There are many designs for mains power supplies around, including this one: http://www.vintage-radio.com/project...y-set-psu.html

Cobaltblue · 28th Dec 2015, 12:51 pm

It was used in sets such as the Cossor AD41 http://www.radiomuseum.org/r/cossor_...able_ad41.html
Bush BP90 http://www.radiomuseum.org/r/bush_bp90_bp_90.html
Ever Ready Model C http://www.radiomuseum.org/r/ever_c.html

This was a commonly used series of valve until the use B7G battery valves which rapidly took over after 1946 (earlier in the US)

You should have no trouble finding a set that used that valve.

Just look on RMorg for Battery sets between 1939 and 1947.

As for HT you can get 10 PP3's from Poundand for £5.

Unless you are going to use it a lot that's really quite economic.

However if you want to make an eliminator there are many designs around and the one linked by AC/HL has been built by many.

Good luck with your search

Cheers

Mike T

julie_m · 28th Dec 2015, 2:02 pm

Or you could build a one-valver around it ...

28th Dec 2015, 4:41 pm

What a good idea, will look the part too. (Lots of websites with one valvers (try one tube too))

blackcat · 28th Dec 2015, 6:32 pm

I know. I've a cat!
I'm looking for a radio to fit the valve and it shouldnt be too difficult..
I've always wanted to build a radio and that is now an ambition. What a useful forum.

Jonathon

27th Dec 2015, 7:26 pm	#1
blackcat Retired Dormant Member Join Date: Dec 2015 Location: Ely, Cambridgeshire, UK. Posts: 4	Marconi valve Hello forum. You can probably tell I'm new to radios by my question. I have recently acquired a Marconi Z14 1N5G DF33 valve and have tried to find a catalogue of some (any) sort online. The only reference I have found are a couple for sale. Can any one please direct me to some information? I dont even know what years they were made-and which radios used them. Thank you in anticipation! Jonathon.

27th Dec 2015, 7:35 pm	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Marconi valve I'm not sure what information you're seeking, but this is a good starting point:- http://www.r-type.org/exhib/aac0058.htm __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

27th Dec 2015, 8:02 pm	#3
HamishBoxer Dekatron Join Date: Aug 2007 Location: W.Butterwick, near Doncaster UK. Posts: 8,935	Re: Marconi valve These were used in battery portables.The make of which I cannot at present remember Marconi or Ever Ready? 1940's. __________________ G8JET BVWS Archivist and Member V.M.A.R.S

27th Dec 2015, 8:27 pm	#4
blackcat Retired Dormant Member Join Date: Dec 2015 Location: Ely, Cambridgeshire, UK. Posts: 4	Re: Marconi valve Thats a very good start thank you---they changed the number!

28th Dec 2015, 12:03 am	#5
Peter.N. Dekatron Join Date: Jul 2008 Location: Charmouth, Dorset, UK. Posts: 3,601	Re: Marconi valve A DF33 is an RF pentode with an octal base and 1.4 volt filament, I suspect the others are equivalents. Peter

28th Dec 2015, 10:36 am	#6
kalee20 Dekatron Join Date: Feb 2007 Location: Lynton, N. Devon, UK. Posts: 7,087	Re: Marconi valve Yes - Z14 is a GEC-Osram type of number, 1N5G an American number, and DF33 a British/European number. All for the same equivalent valve, a pentode on an Octal base, with 1.4V filament.

28th Dec 2015, 11:54 am	#7
blackcat Retired Dormant Member Join Date: Dec 2015 Location: Ely, Cambridgeshire, UK. Posts: 4	Re: Marconi valve I seem to have a new old stock Z14 so I m trying to find a radio to fit it! Even if I don't succeed it's a very nice ornament and didn't cost much. Certainly looks unused. I wonder if there is a way of rectifying down to 90 volts without using expensive batteries.

28th Dec 2015, 12:07 pm	#8
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Marconi valve It's usual to do things the other way round, but someone will doubtless know of one. There are many designs for mains power supplies around, including this one: http://www.vintage-radio.com/project...y-set-psu.html

28th Dec 2015, 12:51 pm	#9
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,874	Re: Marconi valve It was used in sets such as the Cossor AD41 http://www.radiomuseum.org/r/cossor_...able_ad41.html Bush BP90 http://www.radiomuseum.org/r/bush_bp90_bp_90.html Ever Ready Model C http://www.radiomuseum.org/r/ever_c.html This was a commonly used series of valve until the use B7G battery valves which rapidly took over after 1946 (earlier in the US) You should have no trouble finding a set that used that valve. Just look on RMorg for Battery sets between 1939 and 1947. As for HT you can get 10 PP3's from Poundand for £5. Unless you are going to use it a lot that's really quite economic. However if you want to make an eliminator there are many designs around and the one linked by AC/HL has been built by many. Good luck with your search Cheers Mike T __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk

28th Dec 2015, 2:02 pm	#10
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: Marconi valve Or you could build a one-valver around it ... __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.

28th Dec 2015, 4:41 pm	#11
Guest Guest Posts: n/a	Re: Marconi valve What a good idea, will look the part too. (Lots of websites with one valvers (try one tube too))

28th Dec 2015, 6:32 pm	#12
blackcat Retired Dormant Member Join Date: Dec 2015 Location: Ely, Cambridgeshire, UK. Posts: 4	Re: Marconi valve I know. I've a cat! I'm looking for a radio to fit the valve and it shouldnt be too difficult.. I've always wanted to build a radio and that is now an ambition. What a useful forum. Jonathon