Consonance Reference5.5 MKII

The Consonance Reference5.5 MKII is a limited edition amplifier made by Opera Audio, developed around the legendary 300B power tube with custom output transformers utilizing 8 and 16 ohm taps for both current and vintage loudspeakers.

The Reference5.5 MKII is a single-ended tube integrated amplifier, utilizing a pair of 300B power tubes in parallel for each channel, for 18 watts of pure Class A output power.  

This integrated amplifier has four pairs of RCA single-ended inputs to accomodate any line-level audio source, and a preamp output for use in setups with a powered subwoofer. 

The intuitive central meter on the front panel is used to dial in the cathode bias of each individual 300B power output tubes for optimum operation. The amplifier is built with high quality components and materials, such as RA resistors, Auricap XO capacitors, proprietary power and output transformers and point-to-point wiring to ensure the highest quality signal path. The units that we have in stock come with matched PSVane 300B output tubes, and new-old-stock USA-made 6201 and 5687 input/driver tubes from the 1950s/60s. 

Listening notes:  The first overriding impression of inserting this amp in to the system: PERSONALITY! It’s uncanny. It’s difficult to describe, but the individual character and personality of individual musicians and emotion of the performance comes through with unique directness using this amp. Its 18 watt output sounds small on paper, but is wildly expressive and dynamic in the room. 

Specifications:
Control Functions: Volume, Select, Power On/Off
Power Output: 18 watt x 2, RMS 1kHz
Total Harmonic Distortion: less than 1%(10watt, 1kHz)
Frequency Response: (-3dB points at 5 watt) 7Hz-47kHz
Input Sensitivity: 160mV
Input Impedance: 100k ohms
Output Impedance: 8, 16 ohms. (User selectable.)
Signal-to-noise ratio: 80dB
Consumption: 182watts
Inputs: 4 pair of RCA jacks 
Overall Negative Feedback: minimal
Recommended Speaker Sensitivity: generally 90dB or better
Vacuum Tubes: 300B x 4, 12AT7/6201 x 1, 5687 x 2
Dimensions: 17.25" ( W ) x 15.25" ( D ) x  8.75" (H with tubes included)
Weight: 55lb