Description
Tube stereo preamplifier. Generally marked 'Electronic Industries'.
Introduced
1970
Discontinued
?
Revisions
SP-1A
SP-1B
SP-1C
Options
-
MSRP (US new retail)
$750 (SP-1A)
Specifications
SP-1A:
| Frequency response | Aux and tuner inputs: ±1dB 20Hz to 20 kHz |
|---|---|
| Magnetic phono input: ±1dB of RIAA curve | |
| Magnetic tape input: ±1dB of Ampex playback curve | |
| Distortion (THD) | Harmonic distortion: Less than .01% at 5V RMS output 1kHz on either aux or magnetic input, gain max, high impedance. |
| Impulse distortion: Essentially none, 30Hz to 15kHz | |
| Noise & hum | Aux: 90dB below 1V input |
| Mag: 60dB below 10mV input | |
| Gain | Aux: 20dB (voltage gain of 10X) |
| Mag: 54dB (voltage gain of 500X) | |
| Input impedance | Aux: 500Kohm |
| Mag: 50Kohm | |
| Output impedance | |
| Output polarity | |
| Maximum inputs | Aux: 50V RMS @ 1kHz |
| Mag: 750mV RMS @ 1kHz | |
| Rated outputs | Maximum output: At least 30V RMS 1 kHz into high impedance Output load: Up to 2000pF and down to 10Kohm for 5V RMS output |
| Power supplies | |
| Tube complement | (13) 12AX7, (1) 6X4 |
| Power requirements | 117V 50/60Hz approximately 45 watts |
| Other | Tone control range: ±15dB at 20Hz and 10kHz |
| Dimensions | Panel: 15 5/8" W x 5" H, overall depth 14½" Panel mounting cutout: 4½" H x 15¼" W Depth behind panel: 14" (includes cable clearance) Knob and panel clearance: 1¼" |
| Weight | 30 lbs. |
Reviews
Pictures
SP-1:
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SP-1A:
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SP-1C:
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