Check out this new web site at www.About-Guitar-Amps.com It’s full of free info on all sorts of Guitar Amps, Vintage, Practice, Tube, Solid State etc etc. They have a section dedicated to schematics and definitions of guitar amp terms which is useful and informative.
If you want to add more speaker cabs to your guitar amp then there’s a niffty speaker impedance calculator on the site too.
There are reviews on music gear and they want to hear your comments on your gear. If you’ve had a good or bad experience with your guitar amp then let hem know - it’ll help everyone in the long run.
Check it out……..