Useful Accessories for the Shack

This page contains downloadable PDF files of various accessories for the ham shack.

1) A CPO (Code Practice Oscillator) which uses a 117L7/M7 tube. It was originally designed to be mounted inside an Instructograph code machine.

2) A CPO (Code Practice Oscillator) which uses a 70L7 tube. It was originally designed to be mounted inside a different model of Instructograph code machine.

3) Some home-made tube sockets.

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