Description
Tube stereo preamplifier.
Introduced
1982
Discontinued
1987
Revisions

Options
Rack panel, handles, knobs and auto mute. This version is called SP12RM.
MSRP (US new retail)
SP12: $995.
SP12RM: $1,195. Later increased to $1,395.
Specifications
Frequency response  High level section: ±.5dB, 4Hz to 30kHz. 3dB points
below 1Hz and above 70kHz Magnetic phono: ±.25dB of RIAA, 30Hz to 20kHz 

Distortion (THD)  Harmonic distortion: Less than .02% at 2V RMS output, 20Hz to
20kHz Intermodulation distortion: Less than .07% at 2V RMS output 
Noise & hum  High level: (1) 250µV RMS maximum residual unweighted wide band noise at main output with gain control minimum (86dB below 5V RMS output) (2) More than 90dB below 1V RMS inout (less than 20µV equivalent input noise) Magnetic phono: 5µV maximum equivalent input noise, wideband RMS (66dB reference 10mV input) (Less than 1µV above 200Hz or 80dB reference 10mV input) 
Gain  Magnetic phono input to tape output: 34dB Magnetic phono input to main output: 60dB High level inputs to tape output: 0dB High level inputs to main output: 26dB 
Input impedance  50K ohms phono; 100K ohms high level 
Output impedance  Less than 4000 ohms main output and tape output from phono. Recommended minimum load for maximum audio quality 60K ohms and 300 pF maximum capacitance. 
Output polarity  
Maximum inputs  Magnetic phono, 600mV at 1kHz. (3V RMS at 10kHz) High level inputs essentially overloadproof. 
Rated outputs  2V RMS all outputs into 60K ohm loads (Main output capability is 50V RMS output at ½% THD at 1kHz into a 500K ohm load.) 
Power supplies  Electronicallyregulated solidstate supplies. Frequencycompensated highvoltage supplies have a total equivalent lowfrequency stability of 1 farad of capacitance. Line regulation .05%. 
Tube complement  (5) ECC88/6DJ8 dual triodes 
Power requirements  100135VAC 60Hz (200260VAC 50Hz) 30 watts max. 
Other  
Dimensions  15.6" (40 cm) W x 4.5" (11.4 cm) H x 8.9" (22.6 cm) D. Knobs extend .7" (1.8 cm) forward of front panel. Rear chassis fittings extend .9" (2.3 cm). 
Weight  9 lbs. (4.1 kg) Net; 12 lbs. (5.5 kg) Shipping 
Reviews
Pictures
SP12:
SP12RM: