May 17, 2024
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SONY SQD-2020 - The SQ decoder is designed for quad recording on vinyl, employing a variable blend type full logic circuit.
The newly developed variable blend method is used in the F/B logic circuit to blend and suppress crosstalk with opposite phases on the right and left sides. The amount of this blend can be varied according to the input signal.
It has built-in SQ decoder and RM decoder, and also can reproduce discrete 4 ch by using the demodulator for CD-4.
Equipped with a 4-channel master volume, you can adjust the overall volume by adjusting the level of each channel in advance.
You can freely adjust the balance of each channel while watching the VU meter.
There is a built-in tone control for the back amplifier, and the back output can be switched between high and low levels.
Equipped with a phase selector switch, the phase of the front and back amplifiers can be set.
It is equipped with a system switch that gives priority to the 4 ch function. The 2 ch tape position of the monitor switch allows recording / re-monitoring only when the system switch is set to 2 ch.
With built-in 2 → 4 positions, you can enjoy the conventional 2 ch source with the 4 ch hole tone effect.
Model Rating
| Type | SQD matrix 4-ch decoder |
| Circuit system | SQ Decoder (with Variable Blend Type Full Logic) RM Decoder |
| Harmonic distortion factor | Front : 0.1% or less (Input 250 mv, 2 khz) Back : 0.1% (Input 250 mv, 2 khz) |
| Frequency characteristic | SQ, R-MTX, 2 → 4 : 20 Hz ~ 20 kHz + 0 -3dB Others : 10 Hz ~ 100 kHz + 0 -3dB |
| Input Sensitivity / Impedance | Input (SQ, R-MTX, 2 → 4), Discrete Input : 250mV/100k Ω 2 ch Tape, 4 ch Tape, Rec PB (Input) : 750mV/100k Ω |
| Output Level / Impedance | Front Out : 500mV/5k Ω Back Out : 2 v, 500mV/5k Ω 2ch Rec Out:250mV 4 ch Rec Out : 250mV/5k Ω Rec PB (Output) : 30mV/82k Ω |
| SN ratio (SQ separation) | SQ, R-MTX, 2 → 4 : 80 dB (Input 250 mV, A Network) Others : 90 dB (input 250 mV, A-network) LF-RF:35dB LB-RB:13dB LF-LB:17dB LF-RB:17dB RF-RB:17dB RF-LB:17dB CF-CB : 20 dB (input 250 mV, 2 kHz) * Values listed in Overseas Service Manual LF-RF:20dB LB-RB:14dB LF-LB:20dB LF-RB:20dB RF-RB:20dB RF-LB:20dB CF-CB:15dB |
| Tone control | Bass : 100 Hz ± 10 dB Treble : 10 kHz ± 10 dB |
| Semiconductor used | Transistor : 41 FET : 2 IC : 4 Diode : 35 pcs * Values listed in Overseas Service Manual Transistor : 39 FET : 4 pcs IC : 4 Diode : 47 Units |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 11W |
| Power outlet | Power switch not linked : 1 system, 500W |
| External dimensions | Width 400x Height 149x Depth 327 mm |
| Weight | 5.9kg |
| Attachment | Connection code RK-74x3 |
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