EVH 5150 IIIs Tube Head With EL34 Tubes - 120VThe EL34 power tubes deliver smoother contours, and greater sag and saturation that evoke a more modern British sound, all with more sustain and versatility than ever before. Channel one boasts an even finer clear and compressed clean tone, while channels two and three now possess even more compression and saturation. Other features include a rear panel Resonance control section that tailors low frequency response for each channel and a bias testing