UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > Components and Circuits
Register FAQ Forum Rules Calendar Mark Forums Read

Notices

Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

Reply
 
Thread Tools
Old 3rd May 2012, 4:52 pm   #1
FERNSEH
Nonode
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear.
Posts: 2,331
Default ARP12 and AR8 valves

I've had these valves for years and always considered them to be some useless ex-mil types. I'd never find a use for them.

However, I checked out the details of them and in fact they'll be of use someday.
The AR8 is a 2volt double-diode triode and is similar to the Mazda HL23DD.
the ARP12 is a 2volt vari-mu pentode and is similar to the Mazda VP23.
Both have the Mazda Octal base.

www.radiomuseum.org/tubes/tube_arp12.html
www.radiomuseum.org/tubes/tube_ar8.html

The ARP12 has a Mullard look about it. The date or production code on the base is definitely Mullard style. A valve with a Mazda Octal base made by Mullard.

DFWB.
Attached Thumbnails
Click image for larger version

Name:	MOvalves1.jpg
Views:	48
Size:	44.7 KB
ID:	66110   Click image for larger version

Name:	MOvalves2.jpg
Views:	46
Size:	33.2 KB
ID:	66111  
FERNSEH is offline   Reply With Quote
Old 3rd May 2012, 5:03 pm   #2
HamishBoxer
Dekatron
 
HamishBoxer's Avatar
 
Join Date: Aug 2007
Location: Glasgow
Posts: 3,350
Default Re: ARP12 and AR8 valves

They fit I believe a WS 38. Possibly R109.

David
HamishBoxer is offline   Reply With Quote
Old 3rd May 2012, 5:05 pm   #3
FERNSEH
Nonode
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear.
Posts: 2,331
Default Re: ARP12 and AR8 valves

Quote:
Originally Posted by HamishBoxer View Post
They fit i believe a WS 38.Possibly R109.

David
WW2 equipment?

DFWB.
FERNSEH is offline   Reply With Quote
Old 3rd May 2012, 5:13 pm   #4
HamishBoxer
Dekatron
 
HamishBoxer's Avatar
 
Join Date: Aug 2007
Location: Glasgow
Posts: 3,350
Default Re: ARP12 and AR8 valves

Yes indeed.
HamishBoxer is offline   Reply With Quote
Old 3rd May 2012, 6:03 pm   #5
G6Tanuki
Octode
 
G6Tanuki's Avatar
 
Join Date: Apr 2012
Location: Wiltshire, UK
Posts: 1,608
Default Re: ARP12 and AR8 valves

Typical WWII-era valves - the ARP12 and AR8 were often found alongside the ATP4 in portable transceivers like the WS18, WS38 and WS46.

The manufacturer and date-of-manufacturer can be worked out from the "slash" code - the thing like [KB/D] printed on the envelope.

See http://www.vmarsmanuals.co.uk/newsle.../cv_valves.pdf for how to decode.

-G6Tanuki.
G6Tanuki is offline   Reply With Quote
Old 3rd May 2012, 6:23 pm   #6
G4XWDJim
Heptode
 
G4XWDJim's Avatar
 
Join Date: Oct 2008
Location: Kidderminster and occasionally Rustington, West Sussex.
Posts: 565
Default Re: ARP12 and AR8 valves

I'm just in the process of recreating a 3 valve SW TRF using ARP12s on an OXO tin as chassis donated by Phil, G4SPZ. They're a nice valve and when new look magnificent in their bright gold metalised paint.

They're used in a good many WWII sets. The civilian Invicta 43 has ARP12/VP23s in it.

Jim
G4XWDJim is offline   Reply With Quote
Old 3rd May 2012, 8:08 pm   #7
Panrock
Octode
 
Panrock's Avatar
 
Join Date: Feb 2005
Location: Sedgeberrow UK
Posts: 1,005
Default Re: ARP12 and AR8 valves

I think I remember ARP12s in the 88 (or was it 98) sets we had in the Combined Cadet Force at school. One of the channels was blanked off or it would pick up television sound!

All the above offered subject to the vagaries of my dicky memory!

Steve
__________________
www.radiocraft.co.uk
Panrock is offline   Reply With Quote
Old 3rd May 2012, 10:51 pm   #8
FERNSEH
Nonode
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear.
Posts: 2,331
Default Re: ARP12 and AR8 valves

As I mentioned in my first post I have had these valves for thirty years or more and often wondered what I could use them for. Now that I know that the ARP12 is a vari mu pentode for 2 volt battery equipment it could be employed as replacement for the VP2 type of pentode. The VP2 and it's equivalents are greedy for filament current, typ. 0.15amp. Also it's becoming a scarce valve. The VP23/ARP12 is much better in having an If of 0.05amp.
The AR8 can replace many 2 volt triodes.

DFWB.
FERNSEH is offline   Reply With Quote
Old 3rd May 2012, 11:04 pm   #9
FERNSEH
Nonode
 
FERNSEH's Avatar
 
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear.
Posts: 2,331
Default Re: ARP12 and AR8 valves

Quote:
Originally Posted by G4XWDJim View Post
I'm just in the process of recreating a 3 valve SW TRF using ARP12s on an OXO tin as chassis donated by Phil, G4SPZ. They're a nice valve and when new look magnificent in their bright gold metalised paint.
Jim
Look forward to seeing it. There seems to be a revival of constructional projects.

DFWB.
FERNSEH is offline   Reply With Quote
Reply

Thread Tools



All times are GMT. The time now is 6:32 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at http://www.vintage-radio.net.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright ©2002 - 2014, S&P Technology.