Luxman SQ202

1 9 7 0 july 1970
1 9 7 3 march 1973

Alas very rare but part of the first period LUX design masterpieces. And the WL-202 companion tuner is even better.

The phono section is an NF (negative feedback) type 3-stage direct coupling system ; special input transistors allow high input level.
The 2nd stage is a two-channel differential amplification with an emitter-follower circling the attenuator.
Filters and tone controls also are of the NF kind and PRE output impedance remains low at 100 Ohm.

The power section has an emitter follower circuit again, setup as 1st stage to make the input sensitivity variable ; the output section is a DC SEPP full complementary system with 2-stage differential driving circuit and dual power supply.

The features and functions are multi-galore : selectable center-frequncy tone controls, front tape and MIC inputs with respective monitor switch and input level pot & MIC mixing, stereo / reverse / mono L / mono R / mono L+R selector, two low cut and two high cut filters, volume-varying loudness, separable pre/main loop, input level pots for the MAIN in and aux 2 inputs, 3-position selectable phono 2 impedance, five inputs and two tape loops (plus the front) !

And the meters can be (back) switched between PRE levels or Main 0dB and Main -14dB display, too.

I think no other manufacturer ever tried as many possible combinations of layout for the secondary functions as Luxman did - Sony included.
Following the iterations of layouts from the SQ38D to the 202, L-11, L-58A, L-550, C-300, C-05, L-570 or C-06 makes for a nice lesson of how to do things properly. If ever differently !

The wide center-row of switches would resurface later in the 1970s with the L-5 series, in many export-only receivers throughout 1979/1981, then in the L-400 series in 1981.

The SQ202 saw a Bic/Lux receiver version named 71/4R - that's right : a 202 with an AM/FM section added ! Ultra-rare to say the least and another proof of Luxman's really crazy production schemes.

Fiddly fingers, twinkly eyes, happy ears... the SQ202 is b e a u t i f u l.

Luxman SQ202, image 1 Luxman SQ202, image 2
Luxman SQ202 specifications
Title Value
MAIN section MAIN section
Output : 2x 70W RMS (8 Ohm both channels driven)
2x 80W RMS (8 Ohm simple channels driven)
2x 100W RMS (4 Ohm simple channels driven)
THD : < 0,04% (8 Ohm ; 1Khz)
< 0,05% (4 Ohm ; 1Khz)
IMD : < 0,05% (8 Ohm ; 70Hz : 7Khz = 4:1)
Power bandwidth : 5Hz...50Khz (-3dB)
Frequency response : 10Hz...60Khz (-1dB)
Input : 700mV (8 Ohm, for 50W output)
Crosstalk : 66dB
Residual noise : about 1mV
Damping factor : 35 (8 Ohm)
70 (16 Ohm)
Accessories : Output indication meter
Main/remote speaker selector
Headphone jack
Mains voltage selector + ectra mains outlets
input level control
PRE section PRE section
Rated output voltage : 700mV / 100 Ohm (pre out)
110mV / 100 Ohm (tape out)
Maximum output voltage : approx. 5V
Frequency response : 20Hz...70Khz (-1dB)
THD : < 0,05% (lines ; 1Khz)
Inputs : 2mV / 50kOhm (phono 1)
2mV / 30 - 50 - 100kOhm (phono 2)
110mV / 100kOhm (aux 1 & 3)
110mV / 100kOhm (aux 2, with level controller)
2,5mV / 50kOhm (Mic mix)
110mV / 100kOhm (tape in)
Permissible input voltage : 180mV (phono 1 & 2)
5V (aux 1 & 3)
over 5V (aux 2)
S/N ratio (700mV pre out) : 66dB (phono)
80dB (aux)
66dB (mic, mixed with aux 1)
S/N ratio (IHF-A) : 81dB (phono)
90dB (aux)
75dB (mic, mixed with aux 1)
Noise voltage vs. input : -120dB/V (phono)
-110dB/V (aux)
-118dB/V (mic, mixed with aux 1)
Residual noise : approx. 25µV
Crosstalk : 66dB (phono)
71dB (aux)
High filter : 5Khz or 9Khz (12dB/octave)
Low filter : 30Hz or 80Hz (12dB/octave)
Loudness control : + 8,5dB at 50Hz
+ 7,5dB at 10Khz
Attenuator switch : -18dB
Accessories : Tape monitor switches & terminals
Mode selector
Input impedance selector for phono 2
Input level setter for aux 2
DIN tape connector
MIC jack and level setter
General General
Transistors : 2x 2SD218
2x 2SA649
6x 2SC959
2x 2SA606
4x XA495C
43x 2SC1000
Diodes : 4x U05
3x IS1850
4x DS38B
Varistor : 4x SV-03
PC : 270W max.
Dimensions : 48 x 28 x 16,5cm
Weight : 12,5kg.
Listprice : 141,000¥ (1970)
Luxman SQ202 : 1 topic
(last updated topic shows up first)
  • Luxman SQ-202                             (1)last updated by fantasia - 22/08/2010, 06H17
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