Posted by Harlequin [ 195.92.67.72 ] on August 24, 2006 at 15:50:53:

In Reply to: Re: JCM800 50W 4210 developed crackling problem posted by Aki on August 24, 2006 at 14:24:28:

Thanks for the comprehensive answer. Hehe, and on your final point I had actually started to look at other amps, how did you know?!

I've actually found the culprit I think, one of the plates/cathodes(?) in the output valve/tube had come loose, and was floating about freely inside the glass envelope!!! Is this a common fault?

Anyway I think I'll get a new pair of output valves and get an engineer to bias it properly and to give it a pat on the head. Thanks for your help

Replies: