Drake l4b Repair, New l-4b Soft Start, Soft Key, Bias Board. New T/R Bias Relay Board + Instructions

Here I show the repair and mods on a Drake l4B repair plus mods and the two new harbach boards.

I forgot to show the dc positive connections located on the amp rear wall side of T/R Bias relay board.
+ is 24 vdc in – is switched -24 vdc

Enjoy