511 C/D. From 502-531-404, Feb71. Contributed by Jeff Lamb.

Issue 1, undated.   Applies to 500AB.  (M = modular, W = without Bell System markings)  Sets sold outside the Bell System were not covered in BSPs, but were supplied with one page wiring diagrams inserted in the box with the phone.  See BSPs for the 500AB and 500ABM for other details.

Single line for 2-wire or 4-wire circuits.  Comes wired for 2-wire service but may be converted at installation to 4-wire service.  Arranged for but not equipped with a KS-8109L2 Buzzer.  Intended for use in 1A1 and 1A2 Key Telephone Systems and 3B Speakerphone Systems, however it is intended for specially engineered lines.  Not for general telephone use. (The touchtone version is 2504.)

500 Series Desk Telephones, 501 U. With dial lamp and night light feature.

500 Series Desk Telephones, 501 P. Replaced the 500H.

Feb 71.  500 Series Desk Telephones, 500 U, WE500U.  502-580-409 I2

500 Series Desk Telephones, 500 P with dial light.  Replaced the 500H.

500 Series Desk Telephones, 500 H. Replaced by 500P.

500 Series Desk Telephones, 532 A, B (Amplifier for Impaired Hearing) Later production with 7G or 7H Dial.From C38.629 i4 Aug61.  Drawing scanned and compiled by Steph Kerman.

500 Series Desk Telephones, 500A, 500B, 500J and 500K

500 Series Desk Telephones, 500 C/D

500 Series Desk Telephones, 500 CW and DW

500 Series Desk Telephones, 500 R/S

500 Series Desk Telephones, 509 A, B Amplifier Sets for Long Loops

500 Series Desk Telephones, 514 B and 514BM (Headset Jack). 502-580-412 i4 May77, Issue 4, May 1977.

500 Series Desk Telephones, 591AW and 591BW

500 Series Desk Telephones, 510/511 A, B, E and F (Ringer Cutoff, Two Line Pickup and/or Exclusion Key). Drawing scanned and compiled by Steph Kerman.

500 Series Desk Telephones, 500 L/M, WE500L/M.  From C63.446, Issue 1, October 1953.

500 Series Desk Telephones, WE532 (Amplifier for Impaired Hearing) Early production with 7D Dial. From C32.557 i3 Jun56. Scans provided by Paul Fassbender.