Re: Reason for disliking my C30...
The tone of the Classic 30 depends greatly on how loud you're playing it. The trebles kill, in a bad way, when it's cranked. While it can be overly bright, it produces some exceptional rock and blues tones, especially when miked. Here are my general settings after JJ tubes, all using dirty channel. I generally set it to rock and then use my guitar volume/tone knobs to get bluesy goodness:
1. General rock tone- gain channel, pre gain=7, post gain=3-5, bass=7, mid=4-6 treble=6-7
2. Loud rock tone, bump the post gain to 7, bass to 8, mid to 6 treble down to 5-6.
3. Metalish - same as #1 but, pre at 10-12, mids down to 4, treble might reach 8
4. Singing lead tone, hit the boost switch and mess with your guitar knobs, or mids to about 8, treble down to 6, bass up to 9.
All of this is with a Les Paul using Antiquity neck and Seth Lover bridge. Reverb to taste. I love the reverb on this amp much more than the Fender Hot Rod DeVille I had. I like everything about this amp more, actually, except for how it can get buzzy and shake the tubes, but I've remedied that.