The SP-4 preamplifier was designed around the Analog Module which acts as a 'super tube' because it takes the best qualities we see in the vacuum tube much closer to the theoretical ideal.
The SP-4 surpasses our vacuum tube preamplifier in the most important areas. It has increased musical depth and definition with a smoothness that will satisfy any vacuum tube enthusiast.
Frequency response: 5Hz to 100kHz
Total harmonic distortion: 0.005%
Gain: 36dB (MM), 24dB (line)
Signal to noise ratio: 84dB (MM), 95dB (line)
Output: 2V (Pre out), 10V (Pre out Max)
Dimensions: 480 x 210 x 89mm
Accessories: walnut veneered oiled finish cabinet
Frequency response Head amp (optional): 5 Hz to 100 kHz (-3 dB) Magnetic phono: +/- 0.5 dB of RIAA, 20 Hz to 20 kHz High level: 1 Hz to 100 kHz (-3 dB)
Distortion (THD) Harmonic distortion: Less than 0.005% 2 V RMS output (IHF load, with optional head amp or phono input) Intermodulation distortion: Less than 0.005% 2 V RMS output (IHF load, SMPTE method, with optional head amp or phono input) THD and IMD decreases with decreasing output
Noise e hum Head amp (optional): less than 50 nV equivalent input noise with 10 ohms input (RIAA weighted) Magnetic phono: less than 0.5 µV equivalent input noise with 1k ohms input (RIAA weighted). Typically 84 dB below 10 mV @ 1 kHz High level: less than 2 µV equivalent input noise with shorted input and max. gain (20 Hz to 20 kHz). Typically 95 dB below rated output
Gain Head amp (optional): 26 dB Magnetic phono: 36 dB High level: 24 dB (IHF load) Input impedance Head amp (optional): 10 ohms Magnetic phono: 47k ohms (50 pF min.) High level: 50k ohms (nominal) Other values may be substituted. Head amp (optional) adjustable up to 100 ohms. Magnetic phono adjustable up to 100k ohms. Output impedance Less than 50 ohms Output polarity Maximum inputs Head amp (optional): 5 mV RMS 1 kHz Magnetic phono: 150 mV RMS 1 kHz Rated outputs Maximum 10 V RMS (all outputs, IHF load) Power supplies Power requirements 20/240 VAC, 50/60 Hz, 25 watts Other Dimensions 48x21x8.9 cm (rack mount front panel) Weight 12 lbs. (5.5 kg) Net, 15 lbs. (7 kg) Shipping