The OMA Black Knight amplifier is our only push pull amplifier, using the 807 transmitting tube connected in triode mode. This dual chassis design, as with all OMA amplifiers, separates signal and power supply on separate and very substantial chassis, using thick steel plates in black wrinkle finish powder coat and solid walnut, hand built frames with dovetail joinery.
Properly employed, the 807 tube is an astonishing performer, as is the 6J5 type triodes utilized in the input and driver stages. One can use a very wide variety of tube types in this family, none of which are used by other manufacturers, which means that NOS (new old stock) tubes at very low cost can be employed and the sound tailored to taste. The Black Knight requires no preamplifier, and can be driven to full output by the OMA PD1 or other phono stage, or by digital sources such as CD players or DAC's. Both volume and source selection are controlled by phenolic knobs on the amplifiers. A sophisticated LED system allows biasing of tubes by visual means without resort to meters or other external devices.
The Black Knight produces 10 watts at full power, with extremely low distortion and a sonic profile which makes virtually all other tube amplifiers seem colored in comparison.
Dimensions W 22" x D 16" x H 12"
The OMA Black Knight Anniversary Edition Amplifier
In celebration of our 10th year of business (2007-17), OMA is pleased to announce the release of the Black Knight Anniversary Edition power amplifier.
Based upon the time proven and sonically superb circuit of our standard Black Knight 807 amplifier, the Anniversary Edition utilizes very rare, directly heated, Thoriated Tungsten filament HY69 output tubes.
Originally conceived as a radio transmitting tube in the 1930's, the HY69 offers significant sonic benefits as well as a striking visual display due to its brilliantly lit Tungsten filament/cathode. Only produced by one manufacturer for a relatively short period of time, the HY69 is extremely difficult to find today and rarely used in audio amplifiers.
In addition, the Anniversary Edition amplifier takes advantage of the superb sonic richness of another relatively obscure triode tube, the 56, in its front end amplification stages.
Finally, the OMA signature dovetailed walnut casework is joined with antiqued copper components for a look that is at once classic and captivating.