BELL No. 66A

500 ohm plus 400 ohm Non Inductive coil.

Single stroke for use on Test Desks.

Includes Bell No. 56C (modified) and Resistor Coil No 9 (400 ohm) on wooden base.

Replaces 'Sounder 900 ohm' on Test desks only.

Introduced in 1951.

Drawing - 90810.

Specification - S367.

Superseded by Bell No. 56C (drawing 62797).