EARLY Spare Coil Pack for MCR-1 (31/1)

Original WWII early production spare coil pack with the printed on paper conversion table, for the MCR-1 (Midget Communications Receiver), internal type designation 31/1. On some of the early production runs of the MCR-1, the conversion table was printed on paper. Such tables will have faded over time and are often hard to read, these are harder to find.
The MCR-1 is a modular, valve-based MW/SW clandestine receiver developed in 1943 by Captain John Brown for the Special Operations Executive (SOE), and built by Philco (UK). Designed for covert operations during WWII, it was later adopted by Army Special Forces and featured in the famed Jedburgh radio set. The spare coil pack is in good used condition.

Frequency plug-ins. The MCR-1 covers all frequencies between 2.5 and 15 MHz, divided over 3 frequency ranges, plus the domestic MW band from 150 kHz to 1.6 MHz in a single-span. 1 A tuning coil is fitted to one end of the receiver and four such coils were supplied, one for each frequency band. The tuning scale is linear and a suitable frequency conversion scale is printed on an metal plate on each coil.