I built a small am transmitter described in S.C. around 2002 (?)
Its not available as a kit, but all the parts are easy to source, and the PCB is available from SC shop.
I did have an issue with one of the PC tracks, it was either bridged, or open. cant quite remember now.
I think it owes me about $40.
I'll try and dig up the issue/description

It is very low power however, you nearly need it to be on top of the radio.

I picked up the miniature transformers at Jaycar

The original Radio Shack audio transformer quoted (#273-1380) is rated 8 ohms to 1k, center tapped.

Jaycar equivalent is MM-2532.

I already posted that antiqueradio link in an earlier post in this thread!

Thanks GTC for the Jaycar equivalent part number.

Maven

Oops! Sorry Maven, I didn't follow your link and didn't realise it was the same adapter. I liked the idea of it because it's so simple and could easily be built into a chassis.

Cheers,

Warren

Damn, double post! No going back once you've hit the button. A delete post option Brad?

Damn, double post! No going back once you've hit the button.

Just click on Edit Post below your post and replace the text with "(duplicate post removed)"

Ok guys so if I make the adapter as linked above what jacks do I use to plug into the pu on my radio? As mines got two inputs as such! And can't find anything that resembles the original plug.
Thanks a lot for the help

One will be a ground, the other the mono signal input. It depends how original you want to keep it. You could make up a plug to fit it or change it to a RCA socket. I've no idea where you'd find one of those old plugs unless you stumbled across one on ebay or elsewhere. Someone else on the forum may know of a supplier.

Cheers,

Warren

Thanks warren, its hard to find them as my search brings up all sorts of plugs! So I may need to make up some sort of plug, I don't want to modify the radio.

It's hard to tell without seeing a photo but, going by the schematic I think banana plugs may fit. Depends on diameter of the socket holes.

Some banana plugs are tougher than others -- that is, owing to their springiness they are harder to push in and pull out. It may pay to go for softer ones given that the socket was not originally designed for such plugs.

Yeah my searches have found the dual banana plug, not sure if the distance between the two will marry up to my radio! ill do some investigating when I get home!
Also with the schematics of the adapter how do I know which output is ground and which is signal! Will it blow my radio if I plug them in the wrong way?

I wouldn't bother with the connected pair of banana plugs; I'd just use two singles of the same colour (again this assumes that they will fit the socket holes).

The iPod adapter quoted above is not polarized. You can plug it in to the radio either way around.

Just like to thank you all for your help! It's all working as it should! One more question is it wise for me to try get replacement valves so if I ever need them ill have some? Also were do you guys buy them?

Having some known-good spare valves is a good idea if you use the radio routinely. It's not so important if the radio is just a showpiece though.

Members here sometimes have valves for sale. I am about to buy a couple. You can also check out Ebay from time to time as sellers there sometimes offload boxes of them.