Type 20 Crystal Set
Frequency range:  ?
Type 20 Crystal Set. .
Type 20 Crystal Set connection diagram for use with the 1.5 KW transmitter. Download either image to enlarge. 
Images courtesy Hand Book of Technical Instruction For Wireless Telegraphists.

Contributors and Credits:

1)   Lewis Bodkin  <05bodkin555(at)gmail.com>

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July 18/18