The most powerful tube power amplifier from Opera Audio. Uses the famous quad matched EL34 of ElectroHarmonix from Russia in each channel, connected in class AB parallel push-pull mode. Power output is switchable from 75W in ultra linear mode to 35W in triode mode. Fixed bias is used giving external individual adjustment for each EL34 for optimal operating point monitoring. Input stage uses a Sovtek 6922 and driver's stage uses two Shuguang 6N8P (6SN7) metal base per channel. Carefully selected coupling capacitors and military grade metal film resistors used throughout the circuit. Choke and capacitor filtering giving a smooth DC supply. A very small global NFB design to optimize the matching with medium to low sensitivity speakers. Overall an all rounder with superb flexibility and excellent sound to match with most speakers in the market.

SPECIFICATION:

CONTROL FUNCTIONS: Power On/Off
POWER OUTPUT: 60 / 35 watt x 2, RMS 1kHz ( Ultra-linear / Triode )
TOTAL HARMONIC DISTORTION: less than 1%( 50watt, 1kHz )
FREQUENCY RESPONSE: ( -3dB points at 50 watt ) 6Hz-60kHz
INPUT SENSITIVITY: 580mV
INPUT IMPEDANCE: 100k ohms
OUTPUT IMPEDANCE: 4, 8 ohms. ( User selectable )
SIGNAL/NOISE: 90dB
CONSUMPTION: 90watt x 2
INPUT INTERFACES: 1 group ( RCA )
OVERALL NEGATIVE FEEDBACK: Little
VACUUM TUBE: EL34 x 8, 6SN7/6N8Px 4, 6922 x 2
DIMENSIONS: 355( L ) x 200( W ) x 150( H ) mm
WEIGHT: 20.5kg x 2