Fender Super Champ XD

Modifications: 
Jensen C10Q ceramic vintage loudspeaker 
(as in 1962 Fenders) 

Mesa Boogie SPAX 12AX7 pre-amp tube 

SOVTEC  6V6GT power-amp tubes 
(Sovtec is a Russian state-owned company, that makes 
electronic components for the RED ARMY) 

I've tried 4 different brands of tubes, including new Fender 
tubes and these SOVTECs are by far the best tubes in THIS amp. 
JMNSHO :-)