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Hot Receiver

buckeye56

buckeye56

Active Member
A7EE5590-CDCF-4127-A624-628C99D36B43.jpeg

Hi. What is the name of the part in the red box? It’s on the bottom of my Technics SA205 receiver and is very hot to touch. I put a small fan in front of it, but that part is still hot. What causes it to be so hot and is that normal? I’m only using the radio with two small speakers. Thanks.
 
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They can, yes. I don't recall any of the solid state gear I've ever had having transformers that ran overly hot though. Transformers in tube gear can get pretty warm. Do you hear any buzzing or hum coming from the transformer?
 
Lavane said:
They can, yes. I don't recall any of the solid state gear I've ever had having transformers that ran overly hot though. Transformers in tube gear can get pretty warm. Do you hear any buzzing or hum coming from the transformer?
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Thanks, I don't hear anything.
 
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View attachment 2300436 View attachment 2300439 View attachment 2300443 View attachment 2300456 View attachment 2300456 View attachment 2300435 View attachment 2300436 View attachment 2300439 View attachment 2300440 View attachment 2300443 View attachment 2300456 View attachment 2300435 View attachment 2300436 View attachment 2300439 View attachment 2300440 View attachment 2300443 View attachment 2300456 the brass squareView attachment 2300436 object in the ref outline is what gets very hot. Oops sorry for all of the duplicates!
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petehall347 said:
pictures will be a big help this end .
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petehall347 said:
pictures will be a big help this end .
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whoaru99 said:
"Very hot" is subjective (or maybe relative). Any way to get an actual measurement?

How long could you hold your finger on it before you have to pull away due to pain? Maybe 10 seconds. Will count next time. No, I can’t measure anything. Clueless would be a mild adjective to describe my knowledge of audio repairs.
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Yup, that's a tranny. alright. The normal thing to do is disconnect all the secondary wires from the circuits they supply and see if the transformer still gets hot. if it does, it's the transformer itself (which is actually pretty rare if the unit is functioning). If not, one or more of those circuits is overloading the transformer and the real troubleshooting begins.
 
If it gets hot within the first 5 minutes, there could be a problem but if it takes 1/2 hour or more before it gets warm or hot, it's probably fine.
 

You'd mentioned maybe around 10 seconds. I've read some info suggesting that around 140F it's about 5 seconds touch time. So, if it's around 10 seconds touch it's likely cooler than that.

Don't know if that's normal for that rig, but these things vary by model, how long it's been turned on, if its been just idle or cranking out tunes for a while, ambient room temperature, if it's in the open or in a cabinet, etc.

In one of the pictures it looks like you may have the receiver sitting on some sort of towel or whatever. Sometimes things like that can impede normal air movement causing the unit to run warmer than normal. Maybe give it a try resting directly on a smooth surface.
 
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