Looking around for some info on the Boss Katana Mini, all I could find was this post
Modding the Boss Katana Mini for Rechargeable Batteries
The main ICs are :
TI TPA3131D2 Class D power amplifier
JRC2740 op amps
JRC4580 op amp
PT2399 delay/echo
"TI 87" - not sure what this is
Personally I don't find the Delay very inspiring. Maybe they should have gone with an FV-1 instead of the PT2399.
Here's some photos:
Boss Katana Mini
- howmuch
- Breadboard Brother
I'd love to modify this one to have an effects loop or a line-out without the cabinet voicing.