YAMAHA CA-500
¥ 45,000 (around 1973)
Commentary
A pre-main amplifier with a substantial configuration.
The main amplifier section uses a semi-stable complimentary service OTL circuit that is reliable in operation.
The equalizer amplifier in the preamp section uses a monolithic IC to achieve high SN and low distortion.
As with the CA 700, the tone control circuit is a Yamaha NF type with a 2-stage direct-coupled amplifier. At the midpoint of the knob, the tone control circuit is linear with less waviness and residual noise.
Equipped with low and high filters and a loudness circuit.
It is equipped with a coupler switch that can be used separately by separating the preamplifier and main amplifier, and a monaural output terminal that can take out the combined signal of the left and right channels.
Model Rating
| Type | Pre-main amplifier |
| Main Amplifier Section | |
| Dynamic Power (IHF) | 60W |
| Effective output (1 kHz, single-channel drive) | 22W/22W |
| Total harmonic distortion factor | 0.05% (at 20W output) |
| Intermodulation distortion factor (70 hz : 7 khz = 4 : 1) | 0.1% (at 20W output) |
| Power bandwidth (IHF) | 18 Hz to 46 kHz |
| Frequency characteristic | 15 Hz ~ 50 kHz + 0 -3dB |
| Input Sensitivity / Impedance | 775mV/50k Ω |
| Output terminal | Speaker jacks : 2 channels Headphone terminal : 4 Ω ~ 16 Ω |
| Damping factor (1 kHz, 8 Ω) | 40 |
| Signal-to-noise ratio (IHF, A-network) | 85dB |
| Residual noise (pre + main amplifier) | 0.6mV |
| Preamplifier Section | |
| Input Sensitivity / Impedance | Phono1, 2 : 3mV/50k Ω Tuner, AUX1, 2, Tape PB : 200mV/50k Ω |
| Output Level / Impedance | Rec Out (Pin) : 200mV/10k Ω Rec Out (Din) : 30mV/80k Ω Pre Out : 775mV/10k Ω Mono Out : 775mV/500 Ω |
| Frequency characteristic | Phono (RIAA deviation) : 30 Hz to 15 kHz ± 0.5 dB Tuner, AUX, Tape : 20 Hz to 30 kHz + 1 -3dB |
| Signal-to-noise ratio | Phono1, 2 : 65 dB Tuner, AUX, Tape : 85 dB |
| Tone control | Bass : ± 10 dB (70 Hz) Treble : ± 10 dB (10 kHz) |
| Filter | Low : 70 Hz, 6dB/oct. High : 7 kHz, 6dB/oct. |
| Loudness control | 70Hz:+8dB 10kHz:+6dB |
| <General> | |
| Semiconductor used | Transistor : 18 IC : 2 Diode : 8 pcs |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption (Electrical Appliance and Material Control Law) | 120W |
| AC outlet | Power switch interlock : 2 systems Power switch not linked : 1 system max250W |
| External dimensions | Width 400x Height 140x Depth 300 mm |
| Weight | 8.0kg |