ONLIFE Research UM-20
¥ 135,000? (One set of two, released in 1974)
¥ 88,100 (1 unit, around 1976?)
Commentary
A monaural power amplifier developed as an upgraded model of UM-10mkII.
The UM-20 was designed to double the output without losing the sound quality of the UM-10mkII.
Four direct-heating triode 2A3 are used for the outlet tube, which is driven by an input transformer.
In addition, an output transformer developed jointly by Malik and On-Life Co., Ltd. is adopted, and the output power of 2A3PP is 20W.
No NFB is applied like UM-10mkII.
Chrome-plated brass is used for the chassis.
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Model Rating
| Type | Tube type monaural power amplifier |
| Gain | 33dB(max) |
| Input sensitivity | 0.6V/1V (Switching Type) |
| Signal-to-noise ratio | 80dB |
| Frequency characteristic | 30 Hz to 16 kHz -1.5 dB 5 hz to 40 khz -11dB |
| Input impedance | 100k Ω |
| Output impedance | 4, 8, 16 Ω |
| Output | 20W |
| Transformer used | ONLIFE MARIC |
| Vacuum tube used | ECC82 (12AU7) : 2 pieces 2A3 : 4 pieces |
| Pwer | 100 VAC, 50Hz/60Hz, 1.7A |
| External dimensions | - |
| Weight | - |
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