The voltage amplification stage uses two NOS Sylvania PCF80 tubes, while four Czech-made JJ Electronic EL34 tubes handle power amplification. Tube amplifier manufacturers have always played a somewhat different game with distortion specifications, and FiiO is at least publishing both figures. FiiO EA13 (black)Did FiiO Cheap Out on the Output Transformers? FiiO EA13 (silver)Where Does the EA13 Fit Into FiiO’s Lineup? Line Magnetic’s LM-34IA uses four EL34 output tubes and delivers 40 watts per channel in Class AB.