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Technics Model SA-505 Receiver

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Front View
Image Attribution: Technics Brochure
Date: November 8th, 2001

Technics Brochure Highlights

Pure-complementary OCL amplifier. Bridged rectifier is used for DC rectification. Current-mirror-loaded differential stage. Two 8,200 uF electrolytic capacitors are used in the power supply. Outstanding S/N ratio of 73 dB (IHF '78 re 5 mv). MOS FET FM tuner. Flat group delay ceramic filters. High linearity quadrature detector stage. Phase-locked-loop multiplex stage. LED active sensor for FM center-of-channel tuning. 2-colored, 5-point LED signal strength indicator. "Acoustic control" with low and high frequency boost and filter switches. Two tape monitors with two-way tape dubbing. FM muting/mode selector. Main/remote speaker selector. Loudness control. Simulated wood cabinet.

Contributed by Ben
On 2001/11/08


Designed inJapan
Manufactured InJapan
Wood CaseYes
Silver FaceYes
Speaker ConnectionsTwo Sets
Power Consumption340 watts maximum

Width480 mm
Height160 mm
Depth293 mm
Weight20.9 lbs

RMS Power Per Channel63 watts
Damping Factor @ Load Impedance34 @ 8 ohms
Total Harmonic Distortion (THD)0.04% @ full power, 0.02% at 1/2 power
Power Bandwidth20 to 20 kHz
Frequency Response7 Hz - 50 kHz +/- 1 dB
Intermodulation Distortion (IM)0.04%
Meter Range1x, 0.1x, Off
Overload Lamp(s)Yes, also safe operation lamp
Output Meter(s)LED Power Meters

FM Tuner
RF Sensitivity1.9 uV
300 Ohm Binding PostsYes
75 Ohm Binding PostsYes
50 dB quieting sensitivity, Stereo39.7 uV
50 dB quieting sensitivity, Mono 2.7 uV
THD, Mono0.15%
THD, Stereo0.30%
Frequency Response20 Hz to 15 kHz, +1/-2 dB
Capture Ratio1.2 dB
IF Image Rejection60 dB
IF Rejection75 dB
Alternate Channel Selectivity (wide or normal)70 dB
Spurious Rejection82 dB
AM Carrier Rejection55 dB
Stereo Separation at 1 kHz45 dB
Carrier Suppression-40 dB @ 19 kHz, -50 dB @ 38 kHz
Mono SwitchIntegral to FM muting off
Signal Strength MeterYes (LED)
Center Tuning MeterIndication via LED arrows
Stereo LampYes
Muting SwitchIntegral to FM stereo on

AM Tuner
RF Sensitivity30 uV (300 uV/meter for ferrite)
Adjacent Channel Selectivity30 dB
IF Rejection40 dB
Image Rejection50 dB

Single Bass AdjustmentYes
Single Treble AdjustmentYes
High Filter7 kHz, 6 dB/octave, also Boost 100 Hz 6dB
Low Filter100 Hz, 6 dB/octave, also Boost 10 kHz 6 dB
Gain ControlYes
Loudness ContourYes (+9 db @ 50 hZ when gain is at -30 dB)
Number of Tape MonitorsTwo
Tape to Tape Dubbing1,2 and 2,1
Auxillary Input SourceYes
Phono Input SourceYes
Illuminated Source IndicatorsAux, Phono, AM, FM
Tuner Source InputIntegral AM and FM
Headphone Jack(s)Yes
Speaker Selection NomenclatureMain, Remote

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