Bottlehead Forum
Bottlehead Kits => Crack => Topic started by: calmiswar on April 05, 2017, 07:02:24 AM
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Hi everyone,
I have been running the amp with speedball for a few weeks now. Things were generally fine.
But just now, I noticed a very weird issue. When I turned on the amp today, I could hear faint buzzing and it turning into some sort of high pitch static, but I immediately pulled my headphones out. Then, I could actually still hear the buzzing.... I turned the amp off and on once more just to confirm this. The amp makes a buzzing noise with no headphones connected whatsoever.
I'm too scared to connect my headphones right now. This Sunday, I had verified all the voltages in the speedball circuit. Apart from OA & OB on the big board which were 104V each, everything looked fine.
Any help here would be appreciated.
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Tighten the transformer hardware.
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My s.e.x. 3.0 was humming, I swapped out the tubes because one was noisy, changed interconnect cables and moved it to a decoupled hifi rack and regulated power conditioner.
edit: I think because the amp is very heavy, if I lift the back off the table, the noise goes away. It isn't audible unless sitting right next to it, perhaps I will buy or make a decoupling platform and see if it helps.
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Tighten the transformer hardware.
Damn, you're right. 2 of the nuts had come loose. Things seem to be fine now. Thanks a lot!
Curious though, how did that introduce noise/hiss in the headphone as well?