Sidetone subsets

[oldguy]

Is a 584 DG a sidetone subset?

[unbeldi]

The 584-DE, -DF, and -DG subscriber sets are simply ringer boxes that do not have an induction coil.

The DG was I think, the last in the series with a B-type ringer.


PS:  BSP C31.208 i1, June 1954 states that the 584-DG was for use with the 126A-1 teletype. It has a B4A low-impedance ringer (2 x 510 ohm)

[oldguy]

Thanks unbeldi, are there any definitions for the suffix letters on a Western Electric subset?

[unbeldi]

Yes and no.
Not in general.

But in general, the A is the main type for the most common service types. When the first letter is a B, it may have a high-impedance ringer version, e.g. 684-BA, instead of 684-A.
C types, with C in first position or second, are for special services, some with tip id, usually have an extra capacitor, e.g. 554C, 684-BC, but others don't have a ringer.
D-types have a ringer only, with the second suffix indicating the type of ringer installed.
R is a suffix that indicates a relay, T a tube.

Since you mentioned anti-sidetone, those are usually the 400 (wood) and 600 (metal) types, adding 100 to the type number, e.g., upgrading a 534A results in a 634A.

When you study and follow the line of development of subsets then they kind of make sense in historical context, but there are surprises.

[oldguy]

Thanks unbeldi, good info.