Let me tell you a story. I bought these because they were "pulse" rated. Wow!
After hearing a bad oscillation go through the system (it sounded like a Degauss going off over and over), I could smell a burning...
This resistor passed many times it's rated power repeatedly, smoked, cracked in several places, but still tests to 10R and works!!! I replaced it of course, but if you want a reliable resistor these are just excellent!
UB5C-10RF1
After hearing a bad oscillation go through the system (it sounded like a Degauss going off over and over), I could smell a burning...
This resistor passed many times it's rated power repeatedly, smoked, cracked in several places, but still tests to 10R and works!!! I replaced it of course, but if you want a reliable resistor these are just excellent!
UB5C-10RF1
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Good for the resistor but bad for whats causing insipid HF oscillation be it bad design-bad layout- cheap components.
Have you located the reason for the initial problem --is it one of the above ?
Have you located the reason for the initial problem --is it one of the above ?
It was related to PS decoupling and it's been sorted. I was just impressed with the resistor. It rivaled the 47R 5W cement resistor I got to turn orange (like the burner on the electric stove) with a reversed cap. That resistor still works, too.
Resistance wire raised to a high temperature causes a large increase in molecular activity in the metal ( noise ) .
As most of this action in an Audio power amplifier occurs at high volumes it might not matter but if a designed audio circuit has a resistance that is permanently hot that is not good design unless the value/length of resistance wire is very low .
As most of this action in an Audio power amplifier occurs at high volumes it might not matter but if a designed audio circuit has a resistance that is permanently hot that is not good design unless the value/length of resistance wire is very low .