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TRIO WE-8S Muddy Sound Issue

Lioramst

New Member
Hello, long time lurker first time poster here.

I got my hands on a TRIO WE-8S for a very fair price. The unit needed some technical attention and TLC.
I cleaned it, re-capped the electrolytics, and it came back to life wonderfully. the tuner and all inputs seemed to work well.

I started using it as my main for a while, but slowly got the suspicion that something is off. the sound was, tiring, for lack of a better term.
On closer inspection, and comparison to other receivers I have, I noticed that sound is kind of muddy. Too bassy, And not in a tight, fun way. The first proper red flag was the phono input - sludgy muffled sound, almost unlistenable. the same issue happens in the aux as well, to a much lesser extent. I tried to figure out the culprit, to no success. So i come to you, mighty experts of Audiokarma, to seek help and guidance. any suggestions for what i can try next?

A few important points of what I already tried:

1. Different receivers, speakers and turntables. The issue is definitely with the unit. all other components work well with different equipment.
2. The tubes: I re-sited, cleaned the contacts, swapped the EL84s and the 12AX7s (respectively, of course). nothing seems to change to outcome.
3. Balancing the bass and treble potentiometers.
4. Playing through turning on and off - It seems that for a minute or so after turning on, the sound is clearer and more balanced, and then slowly getting worse as the unit warms up.

Thanks to anyone who read through :)
 

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Have all the capacitors been replaced? Does this have any of those nasty Japanese grey paper in oil caps?

Is it expectations? Are the other receivers also low powered tube amps?
 
Have all the capacitors been replaced? Does this have any of those nasty Japanese grey paper in oil caps?

Is it expectations? Are the other receivers also low powered tube amps?
Yes, I forgot to mention that I replaced any paper/wax capacitors that i found. But some are still original.
I tried it with lower power speakers as well, so I really hope its not a matter of expectations. Seems to be abnormal to me.
I added a picture of the current state of the circuit, do you see anything suspicious?
 

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is this with the loudness turned on? sometimes its over-boosted. I've also had things where center on the bass control wasn't actually flat and it had a significant bump.
 
No loudness feature on this one, and at no point on the bass control does it feel "right". the muddiness doesn't go away even on very low bass.
 
Sounds to me like a low powered amp with a poor damping factory trying to drive modern speakers. Try using it with some simple high efficiency full range speakers.
 
Playing through turning on and off - It seems that for a minute or so after turning on, the sound is clearer and more balanced, and then slowly getting worse as the unit warms up.

Could be tube sockets, weak tubes, switch contacts, etc. It will probably need to be put on the test bench and have basic measurements made.

Jack
 
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