MARSHALL: 1974X AKA the Marshall 18w one knob tone controls

Screenshot 2025 05 16 at 5.01.30 pm e413bf7de251

Another simple one knob tone control, this time from the Marshall 18w amplifier, or the model 1974x, whatever you prefer…    Marshall used two different tone controls in the amp.  A lot of folks build the 18w lite, which is just the normal channel of the amp, and they often use the trem channel tone … Read more

MARSHALL: Blues Driver / Boss Discrete Opamp

Blues Breaker x Blues Driver v1 ccd2740bcbac

If you’ve read any recent posts, you may have noticed that I’m experimenting with discrete opamps – specifically replacing standard opamps with simplified discrete opamps – I’ve only played with the Joe Davisson diode compression opamp so far (with some success). While I was checking out DIY Stompboxes, I saw Rob Strand was experimenting with the Boss discrete opamp … Read more

MARSHALL: Blues Breaker, Discrete Opamp Mod

Blues Breaker discrete vero layout v1 2c48024c75bf

I’ve had some success with the Joe Davisson diode compression discrete opamp on some other circuits (namely the Cornish SS-2), so I thought I might try a Blues Breaker – it works…  sounds good.   Apart from the lack of IC, there are a couple of other minor mods to a stock Blues Breaker, mainly a larger input … Read more