JCM800: Difference between 2203 and 2204

[Guitarer]

Is it just wattage?

I plan on building a replica-kit of a JCM soon, and I wanted to know all the differences. Is it just that the 04 is 50 watts and the 03 is 100?

-Holden

 

[BrentDomann]

http://www.drtube.com/marshall.htm