RM50 Red plate....tubes or circuit?

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withmittens

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buzzing noise got louder and louder with crackling. sounded like capacitor trouble. I took a look in the back and one tube was bright red. then i turned it off.

Should I expect the tubes to be bad or does the amp need servicing?

Thanks
 
Most problems are tube related, if you have new tubes...try them it turn the bias right down and then up gradually.

Another way is to swap the tubes and see if problem follows the tube...this is more dangerous because you do run additonal risk of damaging the amp if the tubes is truly failed...can take out a screen grid before the fuse blows sometimes.
 
thanks for the info. seems it was the tubes even though they test good. I think maybe they are very far off match

replacements work well
 
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