HT STUDIO 20 The HT Studio 20 combo is the big brother of our critically acclaimed HT-5 and offers huge versatility for home, rehearsal or studio use. The carefully voiced preamp coupled with a cathode-biased EL34 power amp, provides the user with the ability to create wonderfully lush valve tones through the 12 Celestion speaker.• 20 Watt valve combo• 2xECC83, 2xEL34• Two footswitchable channels• 12 Celestion speaker• Enhanced tone controls• Patent-Applied for Infinite Shape Feature (ISF)• Master volume• Digital reverb• Speaker emulated output• Effects loop• 1-way footswitch included• Cool vintage styling