Yamaha CA-S1

October   1 9 7 8 october 1978
1 9 8 0 1980

Perpetuating the winning formula : the CA-S1 was part of small, transitional and Japan-only lineups, all more or less based on the CA-1010 bestseller.

Just below the top of these "mini-series" (descending from the "R", very similar to the originals, to the "S", "X" and much lower "G", "V" and "Z") was the S1 :

slightly downsized (no Class A, smaller PTs, less heatsinking) but upgraded some :

better componentry, high-Gm high-fT transistors, more elaborate circuits and tone controls, even better layouts and MC stages, lower impdance outputs and a novelty :

the Output Impedance control, the function of which you can find outlined in the diagrams accessible below.

The tag for the CA-S1 was "The Extravagant Pre-Main Amplifier". But it still was selling for less than the CA-2000 or CA-1000III !
Or : how to make just as good (or better) but for less money - the early 1980s were approaching fast.

Yamaha CA-S1, image 1 Yamaha CA-S1, image 2 Yamaha CA-S1, image 3
Yamaha CA-S1 specifications
Title Value
Power output : 2x 90W (8 Ohm, 20Hz...20Khz, 0,01% THD)
Power bandwidth : 10Hz...50Khz
Output impedance control : -1 Ohm...+1 Ohm
Damping factor : 100 (1Khz, 8 Ohm)
Inputs : 2,5mV / ?? (Phono 1, MM)
100µV / 100 Ohm (Phono 1, MC)
2,5mV / 47kOhm (Phono 2, MM)
150mV / 47kOhm (Aux / Tuner / Tape 1 & 2)
1V / 47kOhm (main IN)
Maximum input level : 250mV (MM)
10mV (MC)
15V (lines)
Outputs : 150mV / 600 Ohm (rec OUT)
1V / 220 Ohm (pre OUT)
10V maximum (at 1Khz)
1V / 220 Ohm (pre OUT)
5V max 20Hz...20Khz
Frequency response : 4Hz...100Khz (+0 / -1dB, 8 Ohm)
20Hz...20Khz (RIAA ±0,2dB)
THD : 0,003% (phono MM > REC out, 5V)
0,01% (phono MC > REC out, 3V)
0,003% (line > pre out, 3V)
0,005% (line > speaker out, 45W)
0,005% (phono MM > speaker out, 45W, vol. -30dB)
0,005% (main in > speaker out, 45W, 8 Ohm)
S/N ratio : 87dB (MM, IHF-A)
73dB (MC, IHF-A)
102dB (line, TONE ON)
110dB (line TONE OFF)
120dB (main amp)
Residual noise : 25µV (A-network, vol. minimum)
NDCR : 4mW...90W (MM > speaker out, 1Khz, vol. -20dB, 0,01% THD)
Stereo separation : 65dB
Phono positions : 100 Ohm / 33kOhm / 47kOhm / 68kOhm
Bass control : ±5dB
Bass turnovers : 100Hz...500Hz
Treble control : ±5dB
1Khz...5Khz
Subsonic filter : 12dB/oct. below 12Hz
Loudness : +6dB at 10Khz / +10dB at 100Hz
PC : 250W
Dimensions : 43,5 x 16,2 x 37,2cm
Weight : 14,5kg.
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