Sir ATA . . . . . . .
At that time that coil was the only one being offered and to be found . . . .in all of the world . . . . I do believe.
That was a transformer for a CB RF amplifier stage.
It looked like a direct drop in, size wise for the old unit, but it now is seeming to be a wee bit larger.
The only other option for the original unit, would be to take a 10.7 IF transformer and decrease
its windings turn count ~2/3. . . .not so easy nor much fun.
Your new unit should work fine.
I am considering two situations on your present dilemma.
You will have to refer to past posts schematics.
Using your post #9's photo of P1030690.JPG
You can see the involved feed thru holes of the transformer.
Three associated with the primary and two associated with the secondary.
Now refer to post # 19's schematic.
You can see TR1 27Mhz RF amplifier and using what I like to call upside down and backwards circuitry.
Most commonly you see an NPN amplifiers being fed with + voltage.
In this case it is being positive but having to be referenced to the - 11v found on the emitter.
Also take note that this transformer uses a matching tap just up from the cold (lower) terminal of the transformer primary.
Your new transformers offering, does NOT have that matching tap on it, so you are going to have to place a small jumper wire between that terminal and the lower cold connection.
I would be using a single strand of fine copper wire from AC line cord wire.
THEN you will be getting DC power to that stage, in order for it to now work.
With the great amount of RF gain occurring in that stage, you can negate the non use of a tap of the winding.
Since you WILL have plenty of gain from that stage, and as you can see, there is even provision for diminishing that stages gain, via the use of the 1k trim pot.
Now if that does not solve the problem, the only other question was if the extension leads did ALSO have two extra ones for the metal shields side tabs to get them connected to ground ?
Talk to me . . . .
73's de Edd
