Unable to locate a 684AT subset diagram

[j.bridwell]

I have a Western Electric subset labeled 684AT.  Nowhere can I find a wiring diagram.  The connections are labeled GND, BK, K, and E.  The previous owner connected four-conductor wiring, but has only two from the subset to the receiver.  I thought it would use at least three.  The phone does ring and works for incoming calls, but I'd like to see a diagram if one is available.  Any help is appreciated.  I can supply pictures if that would be helpful.

[Steve K]

Hi:

Try this link, it should be close to what you have.

http://www.telephonecollectors.org/library/weco/634684a.pdf

Steve

[j.bridwell]

Hi:

Try this link, it should be close to what you have.

http://www.telephonecollectors.org/library/weco/634684a.pdf

Steve

Thanks.  I've seen this one before.  Forgive my ignorance, but I'm new to these telephones.  I'm just not seeing L1 or L2 in my set so I don't know where to connect the incoming leads.  Not even sure if I'm following the tip party, ring party, or individual station.

[bingster]

The terminals that are marked GND, BK, K, and E are all on a terminal board.  The L1, L2Y, etc. terminals are on the induction coil.  You may have a induction coil in your subset that is small with the terminals arranged around the coil in a "U" shape, or you may have an older induction coil that has wooden blocks on the end with the terminals on top of the blocks. 

I'm not sure what the "AT" designation is for.  Does yours have a glass vacuum tube in it by any chance?  If it does, disconnect all wiring for the tube and tape the connectors so they don't make contact with anything. 

All telephone service nowadays is "individual station."  What type of telephone are you connecting to the subset?  Whatever model you have, it should connect with a cord which contains either three or four conductors--never just two.

[Steve K]

Tip (L1) goes to the R on the coil and the Ring (L2) goes to the Y terminal.  This is on the 101 (U) shaped coil.  As Bingster said it is individual station, unless of course you are still on a party line.  Do they still have those?

Steve

[Steve K]

Scratch that, L1 is not the R terminal.  It might be identified as RR.

[j.bridwell]

Maybe these will help...

[bingster]

Ohhhhhhh... you're missing the induction coil that delivers the proper voltages to the telephones receiver and transmitter.  It should look like this:

[j.bridwell]

Well, that explains a lot!  I think I've seen an induction coil for sale at one of the vintage phone stores.  Thanks so much.  A picture does help I guess.

[bingster]

The photos definitely help.  And once you get the coil, you're good to go.

[j.bridwell]

Blingster, thanks again.  That's a WE 104A induction coil (not a 101A coil)?

[bingster]

You'll want the 101A for yours.  It's the standard individual station version. 

[j.bridwell]

I got the 101A induction coil, but had to replace some of the existing wiring not to mention it was incorrect to begin with not having the coil.  Before I solder the connections, could you verify the leads are correct?  Maybe I have them inverted?  According to my diagram:

Red goes to C
Black to BK
Yellow to L2
White to K

Thanks!
Philip

[bingster]

Comparing your photo and connection list to my 684A, it looks like it's exactly right on both counts. 

[j.bridwell]

Almost there...

The ringer now works with the new coil and wiring.  Thanks so much for your help.  I'm curious about a couple last things and I'll let this thread die.   Is there a specification document, guide, or thread that outlines how to adjust the ringer?  For example, when the gong rests against a bell, how much space (maybe measured with a spark plug gauge) should be between the contacts?  Should the contacts ever actually touch or should there always be a given amount of space between them?  I assume the tension on the spring is just enough to prevent a tapping ringer?

And what's with the "E" terminal that isn't used?

This is my first foray into vintage telephones as my hobby has been model building for the past 40 years.  I've read a lot already and browsed threads until my head spun.  I want to read a lot more soon and hope these questions weren't too elementary for you!

Thanks,
Philip