L. M. ERICSSON
TELEPHONE AB 500, AB 501 & AB 505

AB 500, AB 501 and AB 505
Framework polished walnut, constructed to hold 2 cells RK 220 or RK 400 (Old Cat. Nos. 595 or 585).

Transmitter RC 120 on arm RC 520.

Receiver RD 110 (546) with Cord RS 4300 (No. 2030) suspended on switch-hook.

Generator for type, see table below.

These generators will ring satisfactorily through the ringer and a line resistance of 25000 ohms.

Ringer for resistance, see table below.

Press button. For short circuiting the induction coil & cutting out the ringer.

These instruments are fitted with a paper clip.

Height of Backboard: 770 mm.
Width of Backboard: 250 mm.
 

The AB 501 was the same as a telephone No. 320 but was fitted with a 1000ohm ringer.
 

In both the 1905 and 1912 Ericsson Telephone Catalogue
 

Last revised: March 28, 2024