Frequency response | High level input: ±1dB 0.2Hz to 100kHz. -3dB below 0.1Hz and above 100kHz. |
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| Phono input: ±.2dB of RIAA 10Hz to 40kHz. ±1dB of RIAA 1.0Hz to 100kHz. |
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Distortion (THD) | Harmonic distortion: Less than .005% at 2V RMS output, 5Hz to 20kHz (Typically less than .001% at midband, phono or line input) |
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| Intermodulation distortion: Less than .003% at 2V RMS output |
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Noise & hum | IHF weighted, shorted input: |
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| Output (Gain down): 6µV (110dB below rated output) |
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| Input (High level): 3µV equivalent input (110dB below 1V input) |
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| Phono: 0.15µV equivalent input (76dB below 1mV input) |
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Gain | At 1kHz, bypass mode: |
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| Phono input to tape output: 46dB (0.2V output from 1mV input) |
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| Phono input to main output: 75dB (0.175mV input for 1V output) |
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| High level input to main output: 29dB (36mV input for 1V output) |
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Input impedance | Phono: Front panel selectable 47K, 100, 30, 10, 3 ohms. Phono input capacitance: 150 pF at 10kHz. |
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| High level: 20Kohms or higher, depending on switch functions |
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Output impedance | 250 ohms main, direct, inverted outputs. 500 ohms tape output. Recommended load 60Kohms and 100pF (20Kohms minimum, 1000pF maximum) |
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Output polarity | Tape outputs, direct output: Non-inverting |
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| Invert output: Inverting |
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| Main outputs (2): Selectable non-inverting or inverting. All outputs may be used simultaneously. |
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Maximum inputs | Phono: 350 mV RMS at 1kHz, 1200 mV RMS at 10kHz (0.1 second maximum duration, 6dB less if continuous. |
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| High level: 25V RMS |
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Rated outputs | 2V RMS 1Hz to 100kHz main, direct, inverted outputs. (Maximum 80V RMS at 0.2% THD at 1kHz into 60kOhm load with 2.85V RMS high level input). |
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Power supplies | |
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Tube complement | (6) 6DJ8/ECC88 |
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Power requirements | 95-135VAC 60Hz, 190-270VAC 50/60Hz, 130 Watts maximum |
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Other | Filter: 25Hz Hi-pass phono subsonic 6dB/octave rolloff (to eliminate ringing) with transition to 12dB/octave at 10Hz. Front panel switchable phono only. |
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Dimensions | 19″ (48 cm) W x 5.25″ (13.4 cm) H x 10.25″ (26 cm) D (each unit). Handles extend 1 5/8″ (4.1 cm) forward of panel. Interconnect cable extends 4″ behind rear of chassis. |
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Weight | SP-11: Net 14 lbs. (6.4 kg); Shipping 23 lbs. (10.5 kg) |
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| SP-11PS: Net 15 lbs. (6.8 kg); Shipping 23 lbs. (10.5 kg) |
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| Total: Net 29 lbs. (13.2 kg); Shipping 46 lbs. (21.0 kg) |
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