Some thoughts after trying different things. Removing the bright cap has suggested above does make the amp sound dull under 3. With it off about 2 on the Volume and 8 on the master you can get into a plexi cranked sound, but it can get dark depending on the speaker. With 20w you can only get a...
I bought a JCM SC 20 and the amp is just too brittle. I tried speakers, tubes but too much bad gain. I had a 78 2204 and it did not sound like that. The 78 had a ton more bass. I was going to shove this down the road then I decided to removed the bright cap. Total game changer for this amp. The...