I ordered a few of these osc. coils for my Philco 40-180. Looking at the schematic from the AES website, the coil appears to have a primary winding and a tapped secondary of 240uH.

On the 40-180, the schematic is show with the band selector in the broadcast position. So to hook up the universal coil, I should have one of the secondaries going to (21A) variable tuning condenser. The other secondary appears to go to (19A) compensator.

One the primary leads, one lead goes to 3rd left terminal of the (28) coils strip assembly. The other primary lead connects to the secondary lug that connects to the (19A) compensator.

Does that seem like the right connection? I can always use jumper clips to hook the thing up to try it.

radlam

Hi radlam

Philco 40-180 shows a 3 band oscillator coil. Universal oscillator coils from AES are only wound for the broadcast band.

http://www.nostalgiaair.org/PagesByModel/336/M0013336.pdf

The broadcast band section is on top is the schematic. Winding to the right is for feedback. If you use jumpers keep leads short. Long leads will effect an oscillator circuit.

Norm

:I ordered a few of these osc. coils for my Philco 40-180. Looking at the schematic from the AES website, the coil appears to have a primary winding and a tapped secondary of 240uH.
:
:On the 40-180, the schematic is show with the band selector in the broadcast position. So to hook up the universal coil, I should have one of the secondaries going to (21A) variable tuning condenser. The other secondary appears to go to (19A) compensator.
:
:One the primary leads, one lead goes to 3rd left terminal of the (28) coils strip assembly. The other primary lead connects to the secondary lug that connects to the (19A) compensator.
:
:Does that seem like the right connection? I can always use jumper clips to hook the thing up to try it.
:
:radlam

Hi Norm,

So on the 40-180 schematic, the first winding on the left between pins 1 & 2 on the osc. is for AM broadcast band.

Then the windings between pins 2 & 3 and 3 & 4 must be the short wave bands.

So one of the primary leads for feedback has to go to pin 2 and the other primary lead has to go to the 3rd lug from the left on (28) coil strip assembly.

I hope that is correct.

I want to see if I can get the AM band working first, which will be a minor miracle if it happens.

Thanks,

radlam