Resistors get hot

[audiophileboss]

The ceramic resistors are getting hot. Music plays through both channels....any help?

 

[Doc B]

Sounds like you don't really need any help. The cathode resistors are doing what they are supposed to do.

 

[Grainger49]

IIRC, those are 5W resistors.  That means they are supposed to put out some watts, but not 5, Paul is more conservative than that. 

BTW, the tubes, top plate and transformer will also get hot.  It is the nature of tubes and Bottlehead equipment.  Look in my Corner at the FAQ Thread.

 

[audiophileboss]

Is my amp ok to use?

 

[audiophileboss]

I left it on for 2hrs. The heat was consistant. No caps or wires got hot. But the resistors could COULD be hot enough to burn my finger...the values are correct when I ohm it out, the plate, 6080 and transformer get warm(6080 gets hot). Is it ok to use?

 

[audiophileboss]

One more thing, I am useing a 1 amp fuse that Eilenne sent me.

 

[Doc B]

Yes it is doing exactly what it is supposed to do and it is OK to use. As your subject header says, resistors get hot. That is what they are supposed to do.

 

[audiophileboss]

Thanks Doc! Bottlehead rocks!

 

[Paul Birkeland]

Hey there Boss,

If the voltages at 7/9 are correct, then the heat across the 3K resistors is correct.

They are 10W resistors, dissipating 2.7W, but they still warm up nicely.

-PB

 

[Grainger49]

Here is how to figure it out.  The resistors are well sized.  If the voltage across them, from the cathode to ground, is within what is specified everything is as designed.