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A modern adaptation of the former Sherwood board
This handy little buffer board is barely the size of a quarter
making it a handy code practice oscillator
An SDR is a useful addition to older gear
providing a wireless sidetone for CW transmission
Drake R-4A R4B Product Detector Upgrade A modern adaptation of theThe dual diode product detector in the 11 tube Drake R 4A (aka R 4A "late") and the Drake R 4B has poor dynamic range, promoting distortion on AGC attack. This manifests itself as annoying clicking and popping on strong signals. A modern adaptation of the former Sherwood board, this active Gilbert cell detector will correct this deficiency. Installation takes only about 30 minutes but does require basic soldering and schematic reading skills. Board
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