used ampeg pf350, or a pf500 if you come across one (But they're pricier often). At 15, you have no reason to be looking for GK stuff in particular - just get an amp with power that is light - GK amps can be hard to figure out at first compared to other brands because they have unusual controls and gain staging that is more at your control than with most other amps.... at least that is the case with the RB stuff I've used.
AMPEG PF heads are very affordable, used. PF350, which I owned for a long time, is 200 watts into 8 ohms, more or less, and 350 watts into 4 ohms. you'll thank me later - I bought one used and it was a workhorse without a single issue and sounded great. Very light too.
AMPEG PF heads are very affordable, used. PF350, which I owned for a long time, is 200 watts into 8 ohms, more or less, and 350 watts into 4 ohms. you'll thank me later - I bought one used and it was a workhorse without a single issue and sounded great. Very light too.