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I need some help with an amplifier of mine. (Technics SA-5170)

WildShadow

WildShadow

New Member
Hello people of AudioKarma! I am very new here so you can call me a noob if you'd like to.
Anyway, that's not the issue here. The issue is this: I have a Technics SA-5170 amplifier that I found from an abandoned house (don't judge) that has been sitting for 15 years, and it used to work VERY Well, I just needed to give it a very good cleaning (pots, sand off the rust, and outside) and the amp worked well for about 2 years, until 2 weeks ago. Out of nowhere, none of the channels work anymore. None as in Main channels and Remote channels. I've looked around on the forums here and I don't really have much "professional" equipment (as i'm quite young), so I'm open to suggestions on how to get this thing working once again! I'd hate to throw it out and give up on it as it's a real trophy, and it's my only old amp (It's from 1977) that I have, and I really like it.
So please, anything I could try and do?
 
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First, welcome to AK! That's a nice looking unit. We need a little more info to help...

Do the lights still come on when you push the power button? Do you hear some sort of click a few seconds after turning it on, or did you when it worked? Have you tried using headphones? That last one would mean it's probably just a dirty relay, which is a cheap and easy fix.
 
Another thing...

It looks like there are two fuses on the back near the speaker outputs. I would suggest taking each one out (by gently prying with your finger since they are glass). If you have a multimeter, set it to measure DC resistance and touch the leads to the metal caps at each end of the fuse. If there is no resistance then that means they are blown, and that would also be a cheap and easy fix!
 
Alright! Some things I have to say here, but that's not a problem
First off, yes the lights do power on and it never clicked after powering on, it only "clicks" as you press the power button. Headphones I have not tried yet, and I have checked that the fuses are perfectly working, and the relay problem I'll have to look into. Thanks for the feedback! I do appreciate it.
 
UPDATE: After some testing I'm afraid to report using the Headphones port has the same problem; No audio output.
 
WildShadow said:
Alright! Some things I have to say here, but that's not a problem
First off, yes the lights do power on and it never clicked after powering on, it only "clicks" as you press the power button. Headphones I have not tried yet, and I have checked that the fuses are perfectly working, and the relay problem I'll have to look into. Thanks for the feedback! I do appreciate it.
Click to expand...

The headphone jack is connected to the same place the speakers are, the main output.
The only difference is they put a resistor in line so that the headphones don't get over driven.
I trust you already checked the 2.5 amp speaker fuse for both channels inside the unit. (F601 and 602). If not it would be a good idea to check them.
 
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