audio research
CSP-1

Description
Tube stereo preamplifier. Generally marked 'Electronic Industries'

Introduced
?

Discontinued
?

Revisions
CSP-1A

Options
30/50 - 150/250 - 500/600 Ohm input and/or output impedances

MSRP (US new retail)
$200 (CSP-1A Hi-Z)
$250 (CSP-1A Hi-Z in; Lo-Z out)
$250 (CSP-1A Lo-Z in; Hi-Z out)
$300 (CSP-1A Lo-Z in; Lo-Z out)

Specifications

Frequency response As mike preamplifier: Hi-Z ±1.0 dB 20 Hz to 20 kHz. LoZ ±1.0 dB 30 Hz to 15 kHz.
  As phono preamplifier: ±1 dB of RIAA playback from 30 Hz to 15 kHz
As tape head preamplifier: ±1 dB of published curve
Distortion (THD) Less than .1% from 30 Hz to 15 kHz @ 2V RMS (Hi-Z) output (typical, less than .02% in midband)
  Intermodulation: Less than .05% 2V RMS output (Hi-Z) (60 Hz and 7 kHz mixed for 4:1 ratio at output)
Noise & hum Total harmonic content as RIAA phono preamplifier: (a) Approximately 300 µV RMS output (Hi-Z) (b) 70 dB below 1 V output (c) Less than 2 µV RMS equivalent input voltage.
Gain Approximately 44 dB, reference 1 kHz (Hi-Z)
Input impedance  
Output impedance  
Output polarity  
Maximum inputs Hi-Z input: 1 kHz 450 mV RMS
Rated outputs Hi-Z output: @ 1 kHz 75 V RMS
Power supplies  
Tube complement  
Power requirements 117V 50/60Hz approximately 16 watts
Other  
Dimensions  
Weight  

Reviews

Pictures

CSP-1A: