Brian May Treble Booster Project History file 2014-07-04 - Started History File. 2015-01-01 - Updated To the Fryer Deluxe version. 2015-02-23 - Fixed R3 a & b designations 2015-07-05 - Updated to show the original BC239A transistor 2021-08-31 - Fixed R4 value to 2k2 in the BOM