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Tubes trouble?

Need help and advice.

Have an ARC PH5 Riaa where the tubes were changed two years ago. Sometimes when I play there is a humming sound that changes character when I put my hand on the cabinet and all of a sudden I am completely free of interference again. Where do I start? Guess it's a tubes that's bad. How do I find which one? Can I change just one tubes or do I have to change all of them? Is there any placement of the four that is less critical if a pipe is in worse condition? Thanks fore comments and tips. // Niklas

titus1

Showing 2 responses by ghdprentice

ghdprentice
6,428 posts
 

I agree with @newbee it doesn’t sound like a tube problem, good advice on likely fixes.

 

But for all my ARC equipment I have an extra set of tubes. If a funny noise comes up in a single channel, I change the tubes in that channel (or both if I don’t know which is which. If in both channels then the 6550. If this doesn’t work I change all the tubes just to be absolutely sure it is not a tube problem. If at any time the problem goes away, I swap in the old until I find the little bugger.

If all tubes are fine it is something else. For me it never has been.

ghdprentice
6,428 posts
 

Great. It is always wonderful to have an easy fix!

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