This week's unknown radio has a bright yellow plastic case with a white front.

Valves: 12AN7, 12BA6, 12AQ5, 12X4. The detector is a solid-state black diode.

The volume control is at lower left, and the tuning knob is at upper right, with a circular paper behind the large dial. There's no dial cord.

Any ideas?

I have no references with a 12X4 -- that valve appears to have been used mainly in car radios in Oz.

Titan (KGH) model PRK from 1961.

The detector diode is a OA74.

Ah, thank you. It does have PRK stamped on the back, which was in the photo. Unfortunately those photos haven't been inserted yet.



Edit: I see from the diagram that it is a reflex design.

AWA Valve manual basically says 12X4 is a 6X4 with a 12.6V only heater: Pin outs same.

Beware of 12AQ5 and 6AQ5. Pins 1 & 7 are G1 and I have seen plenty of disasters from those who think a spare lug on a socket is a tag of convenience and wire to it.

Marc

Photos uploaded.

Robbert: where are you sourcing this stream of uncommon radios?

Brad: thanks

GTC: I've been collecting for about 15 years but not very much now because cheap radios are harder to come by. Most of the earlier ones came from the Trash & Treasure at Prestons. Others have come from antique stores all over the Southern Highlands, and a few from Queensland when visiting far-away relatives. I have no idea of the rarity, I get it because it's cheap. I'm more likely to get it if it's portable and I don't have one of that type already.


However, my enjoyment comes from getting a broken-down radio going again, rather than from having a house full of radios. I'd happily sell them all off if I could get a very good price.

Thanks. I'd started to get the impression that you only collected radios that you couldn't immediately identify

Ha ha, that sounds like me! I buy them kidding myself I'll sell them, but get attached lol, I just won an Astor BPJ, Identical to this one:-

http://www.ebay.com.au/itm/182185761219

(Which I am currently watching), only Dark blue/grey coloured. I tell my wife I "Won" (an auction) a radio! Luckily for me she lets me get away with it, even thought she has finally seen through my deception!
Unusual ones are definitely more interesting!

That one is amazing, not many capacitors in it!

Yes, fortunately, by the '60s, the old waxed paper caps had been superseded by plastic ones. I don't think I even had to do any work on that radio apart from giving it a clean-up. (oh edit, I added the electro on the output valve.)

As for your Astor, it looks nice. I might possibly have one but not sure.

Edit: Here it is.

Wrong photo Brad...

Shall fix this arvo.

Is there a problem?