OptiGain® is AMR’s unique amplification circuitry design: it is the combination of premium thermionic electron valves in the voltage gain stage with a patent-pending “Class X: Jikoda circuit” comprised of matched bipolar output devices.
AMR’s “Class X: Jikoda circuit” in real-time, simultaneously detects and cancels unwanted artifacts in the audio signal: none pass to effect the playback of music.
The same cannot be said of traditional amplification designs found in mainstream amplifiers (of which the lion’s share employ solid-state amplification) that use designs based upon the feedback circuit which in theory and in practice, is ‘after the event’ as it goes back and adjusts the circuit’s input.
AMR through its exhaustive testing and auditioning, found that with generic feedback designs because errors in the audio signal still pass through, it is fundamentally flawed and largely accountable for the undesirable “solid-state signature” leveled at such sources. This is one of the main reasons why many have deemed the use of solid-state devices as an inferior approach to high-quality amplification when compared to the employment of valves.
As a result, with the AM-77, the resultant synergy of the OptiGain® circuit is the ability to amplify the delicate audio signal to an exemplary high level: whilst still retaining the sought-after finesse characteristically found only in the highest quality, “no feedback”, single-ended valve amplification designs.