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Technics SA-500

AM/FM Stereo Receiver (1978-79)

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Technics SA-500

Specifications

Tuning range: FM, MW

Power output: 55 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 40kHz

Total harmonic distortion: 0.04%

Damping factor: 32

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

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

Output: 150mV (line)

Speaker load impedance: 4Ω to 16Ω

Dimensions: 486 x 157 x 329mm

Weight: 11.4kg

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Reviews

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rating
Reviewed Mar 03rd, 2017 by Bowie73

The Technics SA-500 is a well built receiver. Nice sound. Very underrated.

rating
Reviewed Nov 25th, 2014 by longmountainman

I just purchased this receiver to replace my ailing Kenwood and WOW. Never knew my vintage Bose 602's could sound like that. 0.04 THD delivers no fuzz even at high volume. Highly recommend for the budget conscious.

 

Comments

re: SA-500

Hi, just wondering IF anyone's had one of these whereby the FM Tuner just stopped working? AM still motoring along.. Just nothing on FM, but Signal Meter says strong.. Would love to fix this!?

Thanks
CC

re: SA-500

I would check/clean the control knobs, especially the input selector (FM/AM/Phono).
First would be to have the unit turned off, and calmly and gently turn the input selector knob back and forth several (like get tired and then 20 more) times. I have one of these, and occasionally either one channel goes out, or no sound is heard when an input is selected, I think some corrosion builds up on the switch. If you are the type to disregard warnings and remove the screws on the unit (or at least the knobs), then buy some DeOxit (available on amazon) and spray either behind knob from front, or onto the selector guts on the inside. avoid messy overspray, and the closer you get the spray to the contact points of the switch the better the result.

This may do the trick, otherwise see other response (circuit check, etc).

I have also seen the tape selector switch cause similar problems and need 'excercise', but this would affect more than just the FM I think.
good luck

re: SA-500

Troubleshooting the FM circuitry for correct B+ voltages, along with doing a general alignment due to aging is in order.
The FM muting circuitry also tends to become unstable due to aging components.
Of course this requires the usual equipment - o-scope, multiplex and rf generators, along with thorough cleaning of rotary switches involved.

re: SA-500

I have a Technics SA-500 receiver that takes up to 10 minutes after turning on for sound to come out of speakers. Is there a circuit that can be easily fixed to solve the problem?

re: SA-500

Me too. Well, not ten minutes. But easily a few minutes. Then it makes a mechanical "tink" sound as (apparently) a contact is closed, and ... great sound. But the startup interval is getting longer and longer. Did you ever get yours figured out?

karodimitrov's picture

re: SA-500

You must check speakers protection.Also check that there are no DC voltage on outputs of both channels.It looks like a bad electrolytic caps, even in the power supply.

re: SA-500

To Whom it May Concern; Is there anyone that may know of a reason that thee unit HUMS loudly? It hums loudly in both channels until you turn up the volume, then, it's less noticeable. My question is; Is there a simple type of fix that I could possibly do (if described in crayon) to fix this . . .

Much appreciated . . .
Don H

re: SA-500

Is the noise same on every source?
Is the noise on low fequency or high frequency?
Is the volume pot. Ok?
The noise could come from previous stage: could be filtering capacitors or ground conection.

Diagram is low res so i can not indicate the component.

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