1 - power on/off | 2 - bias selector for each tube position including off
After reviewing and awarding his brilliant V-80 integrated with optional Super Black Box and the stand-alone HP500SE preamp, I wanted a pair of MRE-130s. This was based purely on the strength of this prior exposure (for a second opinion, we also have this review of the V-80). I needed drive-anything push/pull tube amps to complete my amplifier arsenal of reviewing tools. And Octave was the very best I'd heard. Andreas recommended the optional capacitance-multiplying Super Black Boxes to assure uncompromised 2-ohm stability. I trusted his recommendation and the order was written.
1 - RCA input | 2 - input selector (RCA, XLR or mute) | 3 - XLR input | 4 + 7- winged speaker terminals | 5 - multi-pin socket for optional power supply box | 6 - serial number | 8 - power IEC | 9 - international voltage and max power draw declaration
Octave history and philosophy was covered in detail in the earlier reviews. In short, Hofmann's father developed the firm as a transformer designer and supplier to medical, radio and industrial clients; Andreas expanded into hifi and valve gear yet keeps all manufacturing domestic to not outsource offshore. As Dynaudio rightly stated, Octave is adamant about comprehensive electronic protection of its output stages. They run 'artificial intelligence' to assure precision bias, strategic power management for delayed ramp-up and constant circuit monitoring and no-fault tube operation. For load invariability and performance linearity, Octave relies exclusively on push/pull circuits with pentodes and feedback. Key concerns are immunity to back EMF, phase stability, wide bandwidth and low noise.