Pioneer QL-60
¥ 39,800 (around 1971?)
Commentary
You can enjoy 4-channel stereo by connecting to 2-channel system with a quadrariser amplifier.
With a built-in クォドラライザー, you can enjoy 4-channel matrix recording.
You can also enjoy 4-channel sound fields using conventional 2-channel stereo sources, FM, or your own tape records.
A pre-main amplifier for the rear channel is built in.
A quasi complimentary service circuit is used and a tone control circuit is mounted.
You can adjust the balance of each channel with the level meter and preset level control for each channel.
You can adjust the volume of all channels simultaneously using the master volume.
It includes discrete 4-channel circuitry and connects 4-channel open reel decks and 8-track cartridge tape decks.
A discrete 4-ch disk can also be played using an adapter.
QL-60 seems to have early and late models.
QL-60 is also listed in the catalog of the 1971 general stereo amplifier (printed in May / June, not owned by us). The one listed here seems to be the early model. Among the listed specifications, preamplifier output, input sensitivity, impedance, number of semiconductors, etc. are different. This seems to be because it was revised for improvement in the later stage.
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Model Rating
| Type | 4-channel decoder amplifier |
| Power Amplifier Unit | |
| Music Power (IHF) | 44W (4 Ω) 36W (8 Ω) |
| Effective power | When one channel is driven 16W/16W (4 Ω) 13W/13W (8 Ω) When both channels are driven 12W + 12W (4 Ω) 10W + 10W (8 Ω) |
| Harmonic distortion factor | 0.5% or Less (Effective Output) |
| Output Bandwidth (IHF) | 20 Hz to 20 kHz |
| Frequency characteristic | 20 Hz to 20 kHz ± 1 dB |
| Load impedance | 4 Ω ~ 16 Ω |
| Damping factor | 40 or More (8 Ω, 1 kHz) |
| Preamplifier Section (Quadralizer) | |
| Output terminal | 1 V (Effective Output) / 50k Ω or More (1 kHz, Load Impedance) |
| Harmonic distortion factor | Not more than 0.5% |
| Frequency characteristic | 50 Hz to 12 kHz ± 1.5 dB |
| Input Sensitivity / Impedance | Source in : 100mV/60k Ω Aux : 100mV/120k Ω (1 kHz at effective output) |
| Recorded output (source in at 200 mV) | 2ch/4ch Tape Rec (pin jack) : 200 mv 2 ch (DIN reconnector) : 30 mV |
| Tone control | Bass (Rear) : -11dB to + 12 dB (100 Hz) Treble (Rear) : -10dB to + 9.5 dB at 10 kHz |
| Hum and noise (IHF) | Aux : 75 dB or more |
| <General> | |
| Semiconductor used | Transistor : 40 Diode, etc. : 8 pcs |
| Pwer | 100 VAC, 50Hz/60Hz |
| Rated power consumption | 20W |
| Maximum Power Consumption | 55W |
| External dimensions | Width 430x Height 145x Depth 310 mm |
| Weight | 7kg |