Audio of Oregon BT-2
¥ 178,000 (around 1978)
Commentary
A preamplifier designed for Audio of Oregon by Barry Thornton, the designer of the Quintessence PRE-1, using an all-stage pure Class A operation circuit.
It consists of three integral modules.
Equipped with a signal / output ON/OFF switch.
Power supply switch is not installed, and continuous power supply is recommended.
It also requires approximately 12 hours of warm-up to reach the best operating condition.
Model Rating
| Type | Preamplifier |
| Input impedance | Phono : 47k Ω Tuner, Aux, Tape : 25k Ω |
| Output impedance | Pre out : 500 Ω Tape out : 10k Ω Mono out : 10k Ω |
| Maximum power output | 6 v (10k Ω Load) 3 v (500 Ω Load) |
| Total harmonic distortion factor | 0.01% or Less (at 4 V output, 10k Ω load) |
| Cross modulation distortion factor | 0.01% or Less (at 4 V output, 10k Ω load) |
| Signal-to-noise ratio (IHF-A) | 80 dB or More (for 10 mV input) |
| Phono maximum allowable input | 150mV(1kHz) |
| Filter | Subsonic filter |
| Pwer | 117 VAC, 50Hz/60Hz |
| External dimensions | Width 483x Height 89x Depth 190 mm |
| Weight | 4.5kg |