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Motorboating after tube change

I posted this on Audioasylum tubes, but I'd like to increase the knowledge base, so here I am.

I own an Aikido preamp that was built for me in 2007. Since I don't use it that much, I haven't replace the tubes till now. After I changed them out, there was clearly audible motorboating emanating from both speakers. I returned each old tube to the unit but the motorboating didn't stop. The only screwup was that when initially replacing the tubes, I accidentally installed a 5751 into the spot for a 5755.

Any ideas?

Thx,

GP
128x128garibaldi

Showing 2 responses by garibaldi

garibaldi's avatar
garibaldi OP
12 posts
 
Thanks, Guys.

Based on your responses and those on AA, I have a coincidence on my hands. Hard to believe, but there it is. Thanks for diagnosing this over the interwebs.

GP
garibaldi's avatar
garibaldi OP
12 posts
 
Thanks for all the responses. It's apparent to me that the fix is beyond my capabilities. Therefore, it's going in for repair. It'll take a while for an answer since the unit needs to be shipped. I will post the results of that repair here when I get it back.

Again, thanks for all the responses. I truly appreciate the information that everyone offered.

Regards,
GP
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