Soundcraftsmen Pro Control Four preamplifier
SERVICED:
*replaced all electrolytic capacitors with quality Nichicon audio caps
*added local decoupling capacitors to all opamp ICs
*lubed potentiometers
*painted cover
*replaced rubber feet
*cleaned
*tested THD and S/N
*played
This preamp uses all solid state CMOS switching to route the audio signal, and does so near the RCA connections so there is no additional noise picked up going to the front of the preamp. And it is one of the best S/N for a preamp. It has many inputs and signal loops for EQ and sound processors. Very versatile.
Frequency response = kHz +/-0.1dB
Input sensitivity for .5V output, phono = 1.75mV, high level = 120mV
S/N 2V output (A weighted, phono = 85dB, high level = 105dB
Maximum output = 8.5V
THD+N = <0.005%
Tone control, bass = +/-10dB @60hz, treble +/-10dB @10khz
Output impedance = 180 ohm
Crosstalk = 90dB
Soundcraftsmen Pro Control Four preamplifier
SERVICED:
*replaced all electrolytic capacitors with quality Nichicon audio caps
*added local decoupling capacitors to all opamp ICs
*lubed potentiometers
*painted cover
*replaced rubber feet
*cleaned
*tested THD and S/N
*played
This preamp uses all solid state CMOS switching to route the audio signal, and does so near the RCA connections so there is no additional noise picked up going to the front of the preamp. And it is one of the best S/N for a preamp. It has many inputs and signal loops for EQ and sound processors. Very versatile.
Frequency response = kHz +/-0.1dB
Input sensitivity for .5V output, phono = 1.75mV, high level = 120mV
S/N 2V output (A weighted, phono = 85dB, high level = 105dB
Maximum output = 8.5V
THD+N = <0.005%
Tone control, bass = +/-10dB @60hz, treble +/-10dB @10khz
Output impedance = 180 ohm
Crosstalk = 90dB
Image 1 of 14
Image 2 of 14
Image 3 of 14
Image 4 of 14
Image 5 of 14
Image 6 of 14
Image 7 of 14
Image 8 of 14
Image 9 of 14
Image 10 of 14
Image 11 of 14
Image 12 of 14
Image 13 of 14
Image 14 of 14