I’ve owned four different 3203 heads. Which is pretty crazy considering most sources cite only around 400 ever being made.
If I’m ever lucky enough to own another one, I will not part with it. I’ve learned my lesson.
They’re killer amps. With a couple real simple mods they’re out of this world.
They sport a single preamp tube (PI), the rest of the pre is SS feeding a 2 X EL34 output section for about 30 watts RMS at 8 ohms.
They’re built every bit as robustly as any other 80’s Marshall. The gain channels are very, very good for 80’s era rock and metal. I used mine for the clean channel. Great as a pedal platform for just about any kind of music.
Simple mod to greatly improve the clean channel- pull the chassis, find C13, and clip one leg. It’s a night and day difference. I also liked to run the GT E34L power tubes in mine. More headroom and girth.
The weak spot is really the reverb, but a better tank will cure that as well. All in all they’re some of my favorite Marshalls. Real sleepers.
If I remember right, there’s something weird with the channel switching. Like I think you can only access the dirt channel by footswitch. You can’t manually switch it on the amp panel. Lots of the rock guys I knew that only used the dirty channels would just jam a dummy plug in the footswitch jack and that would turn on the dirt channel.