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pinkanderson

BC30 Noise

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I just purchased an Epiphone Blues Custom on the internet. It was a showroom model, so it was never gigged. Everything looks like it's in good shape, but this noise that is coming from the amp. When I play in ClassA, channel 1, as soon as I hit about 10 o'clock or around 3 or 4, this "hissy" noise comes through. If I let a deeper note ring out, the noise becomes noticeable. It almost sounds like spring being hit, which scared me, 'cause I don't want it to be a blown speaker or anything that grave. The noise doesn't get any louder when I turn it up, it just comes through a lot more. If I have it in Channel 2, it really comes through all the time, and in the ClassAB, it rings out constantly as I am playing. I noticed that you have to pay close attention to pick up on the noise, so it doesn't disturb any of the actual sound. I have to mention that this is my first tube amp, so I'm really unexperienced when it comes to this subject. I researched online for a bit, but I didn't find much on a similar issue. Could be that it's normal?

 

Any help will be greatly appreciated.

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I have a BC30 and it too was an ex-display model. They do hiss and hum a bit but it is most notable on mine in 15 watt mode. The reverb can also be a source of hiss when turned up loud. I've read that some of the noise is due to the actual design of the amp. If you've just picked it up you probably need to consider changing the tubes first. A lot of really bad hiss could be related to this. I have Electro Harmonix 12AXHs in my preamp section, the stock Chinese 12AX7Bs in the reverb slots; and a pair of (Reflektor-marketed) Sveltlana 6L6GCs in the power section. It didn't cost me a lot for the extra tubes and they improved the sound and performance of the amp - but the hum in 15 watt mode is still present. I prefer 30 watt mode anyway (which is very quiet) so not a huge problem for me.

Hopefully others here will have further advice for you.

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