This EL34 SE amplifier employs common pentode EL34 vacuum tubes for the class A amplification with 6SN7 / 6SL7 as the input stage. The 6SN7 tubes are configured as two cascading stages, the common-cathode and cathode follower, respectively. The output power can reach 10W for each channel. The B+ voltage is supplied by RT400 tube voltage regulator kit which can be configured as either tube rectifier or solid-state rectifier. The filament voltage can be supplied either AC or DC voltages. For filament voltage with DC voltage, a LV30B-5A low voltage regulator kit is required.
Specifications
Tubes: two EL34 and two 6SN7 / 6SL7
Voltage gain: 22dB
Operating frequency: 20-20KHz
Input impedance: 250K Ohms
Output impedance: 4, 8, 16 Ohms
Output Power: 10W
Input sensitivity: 1.2V RMS
S/N Ratio: >90dB
Stereo single-end input and output
Power requirements: one or two 260-280V DC (total 200mA) and two 6.3V AC/DC (1.5A)
PCB dimension: 130mm (W) x 165mm (L) for EL34 SE PCB
PCB thickness: 2.4mm, double layer, 2oz copper.