W.E. 500 Series Set, With 425A Network, And C2A Ringer.

[Dan/Panther]

I'm not sure all of the models that use the 425A network, with the C2A Ringer, so I just listed it as 500.
Please P.M. with a list if you know.
Paul F, tells me the following 500 sets came with the 425A Network, How many had C2A ringers of the following is to be determined.

500
500T

500A, 500B
500J, 500K

501
501T

501A, 501B
501J, 501K
D/P

[Tom B]

D/P
Is there a difference with the wiring of a 500 with a C2A ringer and 425B network, or is it the same as the c4A and 425B?

Cheers,

Tom

[Phonesrfun]

Yes.  The C2A only has two wires, red and black.  The C4A has 4 wires. 

To connect the C2A to the 425B network, connect the red ringer wire to L2 on the network, and connect the black wire to A on the network.  Connect a short jumper wire from K to L1.

[Adam]

I hate to contradict you (really, I do!) but I have a 1953 500 base with a C2A ringer, and as you can clearly see from the pics I just took, my C2A ringer has 4 wires.

[Phonesrfun]

Well, dang.  There is a 2-wire version of the C series ringer, and without checking any documents, I just blurted out my post thinking that since the question was asked, Tom was asking about that one.

Tom, with 4 wires, the C2 ringer would connect exactly the same as a C4.

Now I'm going to have to go and look to see which is the 2 wire version.

And, Dave, it is no problem for me to get corrected. 

[Phonesrfun]

I looked it up.  It's the C3 I was thinking of.

[Tom B]

Thanks to Bill and Dave

[Adam]

Well, dang, me too.  I thought I had a 1957 500 with a C3A in it, meaning I would have had  one of each, C2A, C3A and C4A, in my collection.  But just now looking closer, the 3 is a 4.

[Tom B]

Dave
Is the C3 the frequency ringer?

[Adam]

Bill might know.  I don't own one.  (Only hallucinated that I did...)

[Phonesrfun]

The C3 is a straight line ringer with a single coil.  The C2 and C4 are a split coil ringer.  The impedance of the single coil ringers are the same as the sum of the split coil ringers. 

Why have ths split coil, you ask? 

ANI.  Automatic Number Identification.  Back when there were party lines, the toll equipment needed a way to tell which party was making a long distance call.

The coil was not split evenly in half.  More like about 1/3, 2/3.  Depending on which side was referenced to ground, the toll equipment could tell which party was making a call.