How often should I be replacing my rectifier tubes?

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B-Roll

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Dec 25, 2007
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I've had them in there for a lonnnng time and they're still going strong but I'm starting to get some noise/microphonics. How often should I be replacing the rectifier tubes? The 5U4's.
 
Rectifiers either work or they dont.They can become weaker with age,but you will notice power problems.They dont contribute to noise or microphonics.That is usually caused by preamp tubes.To check which preamp tube is getting noisy,tap each one with a pencil and listen for excessive noise.
 

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