Unknown Valve Radio

colin.hepburn · Post by **colin.hepburn** » Mon Dec 09, 2013 7:32 pm

Hi All
I just acquired this old valve Radio not working due to parts and valves missing the two remaining valves Are MAZDA AC/VP2 and a MAZDA HL.41 DD condion unknown links to valves
http://www.r-type.org/exhib/aag0028.htm
http://www.r-type.org/exhib/aaa0619.htm
Can anyone identified this radio See PICS

colin.hepburn · Post by **colin.hepburn** » Mon Dec 09, 2013 7:37 pm

The two surviving valves

Greg · Post by **Greg** » Mon Dec 09, 2013 9:26 pm

Personally can't help you but post it up on the WD forum. John Caswell Is good at identifying old valve radios and gave me a lot of help a while back with my ancient Pye inherited from my grandfather.

colin.hepburn · Post by **colin.hepburn** » Mon Dec 09, 2013 10:49 pm

Yep thanks Greg I forgot about john

colin.hepburn · Post by **colin.hepburn** » Tue Dec 10, 2013 7:48 pm

Well it appears to be a Murphy Radio Model A46 From 1938

Mike H · Post by **Mike H** » Wed Dec 11, 2013 4:19 pm

Are there 5 or 6 valve sockets?

You've got the IF stage and 1st audio stage triode valve.

What's missing are the 1st heptode or whatever it is frequency changer radio valve, output pentode and supply rectifier, also, if 6 valves, some sort of double-diode for the detector.

colin.hepburn · Post by **colin.hepburn** » Wed Dec 11, 2013 5:34 pm

Mike H wrote:Are there 5 or 6 valve sockets?

You've got the IF stage and 1st audio stage triode valve.

What's missing are the 1st heptode or whatever it is frequency changer radio valve, output pentode and supply rectifier, also, if 6 valves, some sort of double-diode for the detector.

Hi Mike
It's got the five sockets' Three 7 pin one 5 and one 8 pin

Mike H · Post by **Mike H** » Thu Dec 12, 2013 7:11 pm

That implies the first audio triode includes the detector diodes? Or how does detector work

colin.hepburn · Post by **colin.hepburn** » Thu Dec 12, 2013 9:40 pm

Believe that this is the schematic for it
http://www.murphy-radio.co.uk/diagrams/A46.jpg

Mike H · Post by **Mike H** » Fri Dec 13, 2013 10:40 am

A-ha so the correct triode is not HL41 then. Unless someone has modified it by adding a germanium diode for the detector, because could not get the correct triode / double-diode.

According to this:

http://www.r-type.org/addtext/add004.htm

Line-up is probably AC/TP freq. changer (V1) or AC/TH1 if it does short-wave as well (?), AC/VP1 for IF (V2), the AC/HLDD for first AF triode and detector diode, (V3, note in schematic only one is used, the other is 'shorted out' and unused) and the AC/2Pen for o/p pentode (V4). Don't know what V5 is.

Mike H · Post by **Mike H** » Fri Dec 13, 2013 10:51 am

Appendix ~ comparing schematic with its datasheet, V1 could very well be the AC/TH1

http://www.r-type.org/exhib/aaa0493.htm

colin.hepburn · Post by **colin.hepburn** » Fri Dec 13, 2013 5:26 pm

Looks like it’s a UU4/6 according to the Table of voltages I have just found

http://www.r-type.org/exhib/aaa0669.htm

Mike H · Post by **Mike H** » Sat Dec 14, 2013 10:39 am

Oh right well there's the list of valves then

So all mine are wrong except AC/TH1

Whether you can get the missing ones is something else, might be worth asking Gerry at Crowthorne Tubes

Mike H · Post by **Mike H** » Sat Dec 14, 2013 10:42 am

Of course I should have looked at the photo closer, does say AC/VP2 and HL41DD

audio-talk

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