With reference to the subject of my last post, I have been trying to find some information on the "Cambron" brand.
Mine has 5 valves, Philips AK2, 6U7C, 6A6C, 6F6C, 5Y3GT
It has been re-capped, but the tone control pot has been taken out of the circuit and if I can get hold of a schematic, once I've got the speaker sorted, I'd like to get the tone control functional once more.
It has three positions on the selector knob, indicating one or two short wave selections, as the dial also indicates. It appears to be a Melbourne brand, but in the Radio brands PDF, there is no mention of this brand, so obviously a rare one from a small manufacturer.
It is late thirties, hopefully somebody knows something about these radio's? I am very interested to find out. Google searches are fruitless...
Have just emailed Brad some photo's which may help?

The valve types seem odd...

AK2 is a 4 volt Philips with side-contact pins... did you mean EK2 ?

6U7C would be 6U7G

6A6C ... well 6A6 is a twin power output triode with a 7-pin base, unlikely. I'd say it's more likely to be a 6B6G (octal with a top cap).

6F6C would be 6F6G

5Y3GT is fine.

Good luck, hopefully you can find a diagram. Need photos before I can say more..

The valve types seem odd.

Agree, and with your suggestions.

Cambron appears to be the house name used by Sydney furniture company WW Campbell & Co.

Here's a 2 March 1932 ad from the SMH:

http://trove.nla.gov.au/newspaper/article/16844783?searchTerm=text:%22cambron%20radio%22&searchLimits=

(Historical note -- the bit saying: Let us install your radio before the opening of the Harbour Bridge)

In that case, the chassis will have been made by a known radio manufacturer, such as Eclipse.

There are incorrect assumptions here. I have seen and worked on an AWA factory variant on an R301A That utilised the OP valve of the normal model with changes to the entire bias system.

The OP valve fed a coupling transformer, not an OP transformer and was cut back by a cathode resistor. and fed a 6A6 as the PP output.

It was about the same era and an incredible performer and had 3 SW bands.

Marc

Have to admit to not ever hearing of that combination before.

The use of octal valves places the date as late 30s at the earliest.

Really need to see those photos....

It's definitely a Philips AK2 and yes the base fitting is different to all of the others, I got the valve lineup off the red badge on the back of the chassis! Trust me to turn up another strange one! I actually bought it from a shop in Willoughby, so Sydney is obviously where it originates.
GTC, yep! That's the brand!!! You guys are amazing!

Yes the 6A6G has 7 pins!

A strange one indeed, seems Marcc was right.

So all you need is the speaker repaired (uh, good luck with that!), and the tone control hooked back up.

All we can do then is to see what happens next...

The Octal version of 6A6 is 6N7. Quoted as 10 Watts out with 300V on the plate, so beware of the voltage of the filters caps if its got that. 450V cheapies will not do.

http://tubedata.milbert.com/sheets/127/6/6A6.pdf

Funny you should say that, but the electrolytic attached to that particular valve is indeed a 22μF 450v type, about 2-3cm long and 1.5 cm wide approximately.. It appears to that compared to the other one that it has got a bit warm as the surface at each end looks a bit dull, like the roof of a car goes, when the paint is sunburnt.. I wonder what should I replace it with? Perhaps use two of half the value to share the load? The transformer has a 385v tapping, a 5v and a 6.5v, the 5v seems to supply only one valve and all of the others run off of the 6.5v.

My 6A6G has a top cap???

My 6A6G has a top cap???

I'd hope not.

the 5v seems to supply only one valve and all of the others run off of the 6.5v.

I'd assume the 5Y3GT is the one with 5 volts. I'm a little worried about the AK2 getting 6.3 volts when it should only have 4v.

Well nest time I pull it apart I'll check... Must be a resistor to drop the voltage?

Whoopsie daisy sorry Robbbert, my bad there is no top cap on either the 6A6G or the 5Y3GT, only on all the others...