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Technics SA-400

AM/FM Stereo Receiver (1978-79)

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Technics SA-400


Tuning range: FM, MW

Power output: 45 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 40kHz

Total harmonic distortion: 0.04%

Damping factor: 32

Input sensitivity: 2.5mV (MM), 180mV (DIN), 150mV (line)

Signal to noise ratio: 78dB (MM), 95dB (line)

Channel separation: 55dB (line)

Output: 150mV (line), 30mV (DIN)

Speaker load impedance: 4Ω to 16Ω

Dimensions: 430 x 145 x 260mm

Weight: 8.2kg


service manual   English - TR_Audio

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Reviewed Apr 24th, 2016 by uchu


Reviewed Feb 16th, 2014 by bwcarter

Nice looking, but not impressed with the sound quality - at least for the one I have. I could have one that needs recapping or something, but it functions very well so am thinking what I hear is typical. Just can't compare to sound quality of other similar valued vintage gear I own. Can't recommend it for sound, but it does look nice.



re: SA-400

Update to my earlier review...probably too harsh a review...am quite sure now that my example is not close to working properly... must need new caps or transistors or something...tried it again and something is significantly out of whack...my apologies for sounding off prematurely

re: SA-400

Just recently pulled out my Technics SA-400 to use for the patio. Ran ok for a few tests and then went dead. Seems that F1 (main internal power supply fuse) blew. I was thinking about trying to fix it, but now sure whether it's worth the effort. Any suggestions?


re: SA-400

I have also bad experience - poor sound from SA-400.

Just recently I get on eBay Technics SA-400 receiver to use it in my study room. On auction receiver was marked as used&for parts only, but in working condition, with external On/Off switch (main switch S11 out of function) and with plugged ceramic fuse (???) 12.5A in the F601 (original 3.15A – main speaker fuse). When I open wood upper case I was shocked: somebody was playing with power fuses (burned F1 T4A was wrapped with aluminum folia) and speaker protection relay (RLY601). Main fuse F1 was bricked with aluminum folia and relay was naked without transparent case box and resoldered to the back side. Also, it had one STK0040 (right channel) and one STK0050 (left channel) Darlington Power Pack. I think they are good: no shorts between pins 2-3 or between pins 8-9 on both STKs (0.8V between pin 8-9 and 2-3, and 1.2V other direction).

Receiver works but sound is terrible, so I change original caps 45V 10000UF with spare new 63V 12000UF. But sound was still bad - strong but rather distorted. I was thinking about trying to fix it somehow and try to find reason of sound distortion, but now sure whether it's worth the effort. Any suggestions?



re: SA-400

I recently replace the power modules bought from guy on ebay causing the fuse to blow. Works like a champ for almost 40 years and still going. Currently using to drive pool speakers. Cost was about $18.

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