Description
Tube stereo power amplifier.
Introduced
1980
Discontinued
1985
Revisions
D-90 Revised
D-90B (1981)
Options
-
MSRP (US new retail)
$2,195
$2,695 (D-90B)
Specifications
| Power output | 90 watts per cannel minimum continuous (both channels
operating) at 16 ohms from 25 Hz to 20 kHz with less than 1% total
harmonic distortion. Typically below .01% at 1 watt. Approximate
power available per channel at "clipping" (both CH. OP, 1kHz): 105
watts D-90B: 80 watts per cannel minimum continuous (both channels operating) at 16 ohms from 25 Hz to 20 kHz with less than 0.5% total harmonic distortion. Typically below .005% at 1 watt. Approximate actual power available per channel at "clipping" (both CH. OP, 1kHz): 90 watts |
|---|---|
| Power bandwidth | (-3dB points) 12 Hz and 60kHz D-90B: (-3dB points) 12 Hz to 50kHz |
| Frequency response | |
| Input sensitivity | 1.2V RMS for rated output (adjustable) |
| Input impedance | 75 kOhms, nominal at maximum gain |
| Output taps | |
| Output regulation | Approximately .8dB, 16 ohm load to open circuit D-90B: Approximately .3dB, 16 ohm load to open circuit |
| Overall negative feedback | 17.5dB D-90B: 21.5dB |
| Damping factor | Approximately 12 D-90B: Approximately 25 |
| Distortion | Intermodulation distortion: Less than .5% at 1 dB below rated
output (100V p to p, 16 ohms) (SMPTE method) D-90B: Intermodulation distortion: Less than .3% at 1 dB below rated output (100V p to p, 16 ohms) (SMPTE method) |
| Slew rate | 20 V/µs D-90B: 15V/µs |
| Rise time | 2.5 µs D-90B: 5 µs |
| Hum & noise | Wideband, unweighted, more than 90dB below rated output Line components, more than 80dB below rated output |
| Power supply energy storage | 240 joules total |
| Power requirements | 105-125VAC 60 Hz (210-250VAC 50 Hz) 800 watts maximum. 400 watts at "idle". 500 watts at rated power. |
| Tube complement | D-90: (4) 12AX7, (2) 6FQ7, (2) 12AT7 (4 matched pairs) 6550, (1) 6550 |
| D-90 Revised: (4) 12AX7, (2) 6FQ7, (2) 12AT7, (4 matched pairs) 5881, (1) 6550 | |
| D-90B: (1) 12AX7, (5) 6922, (4 matched pairs) 5881, (1) 12BH7, (1) 12AT7 | |
| Other | |
| Dimensions | 19" (48 cm) W (standard rack panel) x 7" (18 cm) H x 16.5" (42 cm) D (front panel back). Handles extend 1 5/8" (4.1 cm) forward of front panel |
| Weight | 64 lbs. (29 kg) Net, 80 lbs. (36.3 kg) Shipping |
Reviews
Pictures
D-90:
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D-90B:
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