Single ended triode/ultra linear mono amplifiers based on 3 x 6550 power tubes.
Low distortion, medium power, shunt feedback design.
Some key figures:
| * | Triode | Ultra linear |
|---|---|---|
| Bandwidth (Po=10W, -3dB) | <10Hz-70kHz | <10Hz-75kHz |
| Max power output (rms) | 20 Watt | 40 Watt |
| Distortion (Po=10W) | <0.6% | <0.3% |
| Damping factor | 6.9 | 5.3 |
Schematics power amplifier:
Power supply:
Magic Eye Indicator:
Distortion pattern 400Hz 10W UL: (2nd harmonic: -54dB = 0.2% HD)
Square wave 10kHz 10W:
On the test bench:
Lined up:
Internal wiring:
Full wiring diagram
Transformers and chokes by Sowter UK
Chassis work by Mapletree Audio Design
Overall design by: Jan Erling Veiset, MNITO.
(c) Jan Erling Veiset, 03-Sep-2006 - E-mail: valhalla[at]mikke-mus.com