I bought a socal a 70's one , i see this as a 67 reissue with some 70's specs, the pickups are very hot, the bridge is 14,50 k ohm and the neck is 15,64 k ohms and i bought it new for 2.00,39 euro instead of 2.690 euro and i like it here is a picture of it
To me a jcm800 2203 is just a amp, 100 or 50 watt, it doesn't sound like i want, hasn't have the gain ,that i wanted, needed a boost or overdrive to get it in the ballpark to wat i wanted, till the 5150 back in 92 came around it can do wat a marshall can and wat not, i think marshall is...
Have you try a mod on v1 a 2k7 and the 680 nanofarat bypass capacitor, try 1k8 and 1uf bypass should have a bit more gain ,also the negative feedback resistor ,if it's a 100k you could change it to 56k and add a 100 pico ceramic capacitor parallel to it, then you can change the phase inverter...