Thank you for your response. I had scavenged the oscillator coil from a GE tabletop radio of unknown model. That radio had lost its data sticker, half of its tubes, and external wiring long before I picked it up, so I'm not even certain where to begin to find its schematic or information.

I am using the coil as part of a simple AM transmitter as part of a compare and contrast project for school (my team got an A, even with the tube transmitter not working properly). it does transmit, but at frequency 1/10 of where they should be, i.e. in the 600Hz range. In fact, the schematic that you posted with the 1A7 tube is the schematic I'm going off of.

As for the physical appearance of the coil, it is a 4 terminal lug coil. I've got another coil lying around that I'm going to try (one that has a marking between terminal 1 and 2) after finals are done.

Thanks for the reply and once finals are over, I will be getting back to that project so I can get it working.

Ken

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: : : : : : : : : : : :Sir Ken . . . . : : :Whut ?. . . . no takers yet . . . . in giving you a comeback response. : :( Shame, Shame, SHAME . . . a la Gomer Pyle ) : : :Seems like a SINGLE lug connection, connotation is not particularly viable in respect to ITS solely being assigned to an oscillator coil. : : :Since an AM radios oscillator coil, by virtue of its design application, is usually falling into the use of two coils, with each having TWO :terminals associated with each winding. : : Therefore . . . . note, below, the two windings and the applicable pair of lugs associated with each winding. : : : :OSCILLATOR COIL PHOTO AND ITS APPLICABLE SCHEMATIC DIAGRAM: : : :It is (L2) and note its 4 terminals. : : : : : : : : : : : : : :Now let's throw you for a loop and the additional other variant in the respect of the joining of two of those windings for making just three connections being necessary. That is shown in the other info below. : : :And note it having only 3 terminal lugs. : : : : : : : : : : : : : : :So why don't you come back with your model number and brand of PARTICULAR radio that you are involved with, and therwith, we can dissect its schematic and involved circuitry and fully 'splains it to you . : : : : : : : :73's de Edd : : : : : :Be content with what you've got, but just be SURE that you've got plenty ! : : : : : :

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::How can I tell which lug is the primary lug on an oscillator coil? Or is there even such thing?
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