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This handy little buffer board is barely the size of a quarter
A modern adaptation of the former Sherwood board
An SDR is a useful addition to older gear
The required connections for the FTDX-1200 are on the top of the board
The board is fully assembled
Drake R-4A R4B Product Detector Upgrade This handy little buffer boardThe 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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