Collins 75A Series Plug-In Calibrator for 75A2, 75A3, Receiver

100kc Crystal Calibrator for 75A2 Receiver

Homebrew Subsitute Calibrator
Build this simple project yourself

Homebrew Crystal Calibrator for Collins 75A2 Receiver, Top View

Homebrew Crystal Calibrator for Collins 75A2 Receiver, Plug-in End View

Homebrew Crystal Calibrator for Collins
75A2 Receiver, Xtal plug-in End View

Homebrew Crystal Calibrator for Collins 75A2 Receiver, Underchassis wiring

Collins Plug-in Crystal Calibrator Schematic Diagram, from Collins Manual

Collins Plug-in Crystal Calibrator Pictorial Diagram

This is a homebrew project to take place of the Collins Plug-in Crystal Calibrator for the 75A2

NOTE: These pictures are NOT very good, will replace them later, using $50 Kodak.
Constructed in an aluminum mini box.
Tube is 6AU6 (6BA6, 6AH6 and others will work).
Collins circuit diagram to be posted soon.
8 pin octal plug.- NOTE POSITION OF INDEX KEY ON PLUG.
100kc xtal use socket to match your crystal
Parts not critical, 250+ DC working volts.
Shielded or unshielded 7 pin miniature tube socket.
Pictorial diagram to be posted soon, for component and wiring placement.
This unit was constructed by WB6FZH in 1988.

Last Updated: April 22, 2007