Special Operations Executive B MkII koffer zend/ontvanger.
weggum.com
   Bron/Source: Internet / Crytp Museum / TNA London / Helge Fyske.

Zie ook: https://www.pa3esy.nl/military/gb/army/B2/html/Type-3-2.html
For more details please see:


The B Mk II set.
Transmitter diagram - transmitter pictures.
Receiver diagram - receiver pictures.
IF Stage diagram.
Power supply - Settings - Powersupply pictures.
Descriptions - Page 5 - Chart - Coils.
Appendix A - Appendix B.
Maintenance.