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Sony STR-6036 channel stops working

L

LinasM

New Member
Hi gents,

Apologies if this is not the right sub-forum, as you can guess by my post count I'm a completely new member to the forum!

I'll cut to the chase - about a year and a half ago I bought a Sony STR-6036 amplifier. It came in really good condition, the bulbs are working, all the channels were working, and I enjoyed using it as my main amp (fits the room asthetic, I'm a fool for visuals) for a while now. Recently though sound will either randomly go very quiet on one speaker, or completely cut off from one of the speakers.

Interestingly enough, my turntable that's using phono seems to be OK. My first guess was that the input for AUX channel was faulty, but then I switched the TV over to the tape instead of AUX input and the issue seemed to come back after a little bit. It seems like flipping between phono and aux a few times makes the problem go away occassionally, but it keeps happening more and more recently.

My natural guess was that the actual input device (TV) was faulty, as the problem seemed to occur on both aux and tape channels. I used to connect the amplifier to my TV via a 3.5mm jack to RCA, and I hoped that buying an optical DAC so it's optical -> RCA will fix the issue. Alas, I'm now using the DAC and the exact same issue seems to reppear regardless of whether the input is going into tape or AUX.

I'm a bit at a loss here because the problem doesn't seem to persist on the Phono output where the turntable audio is coming out. Any idea?

EDIT: Worth mentioning that I can't reliably reproduce the issue on demand. Seems to happen at the most inconvenient times when we're trying to watch something late in the evening.
 
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Welcome to the forum!

Your issue is possibly due to poor connections in the function switch. The knob actually controls slider switches which are under the board (accessible from the bottom side of the unit.) Giving them a thorough cleaning with deoxit, followed by faderlube (to re-lubricate the sliders) might resolve your problem.

It takes a little effort to get the deoxit to the right areas in those switches. Just spraying it in an opening likely won't get it where it needs to be. You need to look carefully and determine exactly where the sliders are inside, then turn the knob to get the switch in the best position to reach the sliders. Once you've successfully gotten it in the right places, work the switch back and forth multiple times then follow with the faderlube (again in the correct locations.)
 
Last edited:
Welcome to A.K. dtto's.
Should you not wish to delve into switch cleaning. i.e. tech skills. perhaps the 3.5mm jack and wire quality isn't a good connect, could try the TV rca out? Most Tv's have them. Phono is a sep. circuit but it is on the selector sw. too.
 
Binkman said:
Welcome to A.K. dtto's.
Should you not wish to delve into switch cleaning. i.e. tech skills. perhaps the 3.5mm jack and wire quality isn't a good connect, could try the TV rca out? Most Tv's have them. Phono is a sep. circuit but it is on the selector sw. too.
Click to expand...

Ahh, that was my first thought, but I've tried an optical out from the TV. Bought a cheapo DAC from Amazon, but the end result is exactly the same! :(

I don't mind delving into switch cleaning, got a tiny phone solder as well if something needs soldering. Just thinking if there's some other TLC I should do to the amp if I already have it open?
 
50 Green said:
Welcome to the forum!

Your issue is possibly due to poor connections in the function switch. The knob actually controls slider switches which are under the board (accessible from the bottom side of the unit.) Giving them a thorough cleaning with deoxit, followed by faderlube (to re-lubricate the sliders) might resolve your problem.

It takes a little effort to get the deoxit to the right areas in those switches. Just spraying it in an opening likely won't get it where it needs to be. You need to look carefully and determine exactly where the sliders are inside, then turn the knob to get the switch in the best position to reach the sliders. Once you've successfully gotten it in the right places, work the switch back and forth multiple times then follow with the faderlube (again in the correct locations.)
Click to expand...

Hm, I'll give that a go as well. Will need to buy some deoxit and faderlube first!
 
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