Diagram extracted from the BSP. Provided by David M Willingham through www.classicrotaryphones.com/forum/

This is a diagram for connecting a sidetone desk stand, such as a 51-AL, to an anti-subset such as a 684A.

Note: This is *not* the more common NYT diagram, which has a limit of one station (no extensions) on the line, because of the permanently connected black condenser wire to the line.

Check other issues of C63.373 and addenda for other options.

From Western Electric Catalog 9, 1935.  Contributed by Jeff Lamb. 

From Western Electric Catalog 9, 1935.  Contributed by Jeff Lamb. 

Desk Stands, 151AL Anti-Sidetone Dial Version. Redrawn and simplified by Bobby Koch.

Updated on 09/11/2012

Desk Stands, Rack Cording for Desk Stands with 229 type Transmitters. (Single and Double Wire). Colorized version by Peter Z.

Desk Stands, 20AL, 20CM, 40AL, 40CM Sidetone20AL, 20CM, 40AL, 40CM Sidetone

Desk Stands, 50AL Local Battery talking using 2A dial and 534-Y Subscriber Set

Desk Stands, 50AL Earlier Drawing

Desk Stands, 50 Type Cording

Desk Stands, 50AL, 50CM Sidetone

Desk Stands, 51CM, 51AL, 52AB Sidetone. The 5A varistor shown is required only for 52AB and 152AB desk stands, and when used at sidetone stations on grounded ringing lines the subscriber set must have a separate ringing condenser except subscriber sets having 313A vacuum tubes.

Desk Stands, 51-AL Cording

Desk Stands, 51-AL Rack Cording

Desk Stands, 51AL Earlier Drawing

Desk Stands, 51AL Modified for Anti-Sidetone Service. The 5A varistor shown is required only for 52AB and 152AB desk stands, and when used at sidetone stations on grounded ringing lines the subscriber set must have a separate ringing condenser except subscriber sets having 313A vacuum tubes. Use should be restricted to individual lines without extensions and only one low impedance or two high impedance ringing bridges are permitted on the line.

Desk Stands, 120AL, 140AL Anti-Sidetone Manual Only

Desk Stands, 151R. Use when more than one desk stand is connected to a single anti-sidetone subscriber set.

Desk Stands, 151AL, 152AB Anti-Sidetone. The 5A varistor shown is required only for 52AB and 152AB desk stands, and when used at sidetone stations on grounded ringing lines the subscriber set must have a separate ringing condenser except subscriber sets having 313A vacuum tubes.

Desk Stands, Rack Cording for Desk Stands with 229 type Transmitters. (Single and Double Wire)

Desk Stands, Local Battery with Magneto Subset