Hi,
I have been given an old valve radio and would like to identify it and find a circuit diagram. It is from a radiogram; ARTS&P no. 414921; the word "Classic" on the cabinet; TM51324 stamped into the chassis; 5 valves. I have found a similar looking chassis and cabinet at this web site:-
http://home.alphalink.com.au/~cambie/Classic.htm.

The glass dial of my radio has illustrations of what appears to me to be a Roman soldier with helmet at both edges of the dial, facing inwards.
Can the ARTS&P number or the TM number uniquely identify this radio??
Is there a web site with more photos of "Classic" radios??
Is this an easy id for experienced people, or do I need to post some photos??
Merry Xmas, Ian

Click on image for larger resolution

Hi Ian

I have reference to a few Classic model TM. the thing that might narrow it down is the valve line up.

What valves are in your set. This will tell me what Diagram to get to you.

Daniel

Double Post Sorry!

(Its doing it again Brad!)

HI Flakes,

Some valve id numbers are gone. This is what I've got:-

1. Mullard 5Y3 GT 5 pin rectifer
2. Radiotron 6?8 GT 8 pin connected to variable cap
3. Radiotron 6U7 G 7 pin remote cutoff pentode, connected to IF can
4. Phillips 6SQ7 GT 8 pin twin diode, high mu triode
5. Radiotron ?????? 7 pin

Cheers,
Ian

Missing links: If that has Shortwave I would expect 6J8 (Triode Hexode Converter) otherwise the Pentagrid 6A8 (Heptode).

I assume this is a minature 7 pin socket for something like a 6AQ5 (Pentode output)?

That would make it probably early fifties?

Marc

Ok from the looks of the part valve numbers. The line up should be

6J8GA, 6U7G, 6SQ7GT, 6V6GT and 5Y3GT.

This is assuming that when you say 7 pins, that that is how many physical pins ate on the valve base. All the valves should have a black Bakelite base. If this is the case then the above listing is correct.

if the above is true then it is a 1948-49 TM5. and I have the cct for it.

Hi Daniel & Marc,
All the valves are mounted on 8 pin sockets; the pins I quoted are the numbers of pins on the valve bases. None are minatures.
Daniel, can you please send me a copy of the cct, my email address should be visible.
Thanks and Merry Xmas to all,
Ian

You should have them now!

Hi Daniel,
Circuit diagrams received. Many thanks. Will let you know of my progress to get this radio running.
Cheers,
Ian

Hi Daniel,
Circuit diagrams received. Many thanks. Will let you know of my progress to get this radio running.
Cheers,
Ian

Oooppps ... double post was my fault ... Xmas celebrations have started to take their toll!

It could be that an accidental second click on the posting button may be the cause of the repeat posts. I'll have to find the JavaScript I have that greys out a clicked button and enable it for the forums.

In the meantime don't worry about it. I will delete the repeats in due course.

Merry Christmas to all. It's great to see that our interest in old radios doesn't wane even on Christmas Eve.

Please refer to the number of pin holes in the socket, otherwise that can cause hassles.

Pin 6 of 6V6 rarely has a pin in in the base & 5Y3 some times four. If you said the numer of pins on that, with no number, we would think it to be an 80 with a UX4 base, not an octal.

Marc

Hi guys,
Traced the Classic TM5 circuit diagram against my radio ........and it matches ........except for the output voltage of the transformer (and higher value resistor in anode circuit), and where the oscillator links to the 6U7G.
This old radio will need lots of work .......
including new caps, some re-wiring, some safety work etc..
Marc ,,,,point noted, my in-experience showing!
Brad, thanks for including the photos in my original Post.
Cheers, Ian

It's a pleasure. It's funny in a way - I said on the front page that no admin work would get done over the Christmas period and here I am doing plenty of it, alongside a planned development of an entire new site. I guess one can take a vintage radio away from the man but one can't take the man away from vintage radios.

On the subject of new sites... I wasn't going to do this but I will give you guys a peek at what Vintage Radio may have ended up looking like. I did this static mock up about a year ago now when I first made plans to replace the current site. The trouble is that I didn't like what I'd done so I didn't continue with construction beyond the concept itself.

I'm working on something that looks much more appealing but I won't give away too many details on that yet, just in case I don't like what I've done again.

What I will promise is far more usability for members as far as features and functions are concerned. Most of you will have heard of weblogs, forums, web directories, article depositories, file storage sites and information portals. Vintage Radio Mk V will be all of those things and more.

My main obstacle is finding the time needed to undertake such a massive project but we'll get there in the end.

Happy New Year chappies! - just in case I don't get to say it over the next few days.

I have been working through the circuit, testing various components. A couple of questions, all valves removed:-
1. The transformer primary and both main secondary windings show about 30 and 220 ohms respectively (DC resistance). However, the heater windings are very low ~0.1 ohms. I was expecting at least a couple of ohms. Comments???
2. Valve heater resistances vary between 0.5 and 4.5 ohms. However, the 6U7G valve also has a small resistance 0.3 ohms between the heater and cathode. I was expecting open circuit. Comments???
3. I have added a fuse on input side of transformer. Rectifer heater rated at 2A + 4 other valve heaters at 0.3A. Is a 5A fuse about right???