Cheap 20 Watt Tube Amp

[Drak_nyen]

Hi Everyone,

I have a cheap little unbranded Chinese 20 Watt tube amp that appears to have picked up an odd little issue and I was wondering if I could pick your collective brains about it.

After a while of being on the Amp starts to make a popping noise.

This happens randomly after about 10-15 mins.

Is this a sign of the power amp tube on its way out???

Thanks for any help
Cheers
Pete

[Gryphon]

Either that or the biasing needs adjustment. Either way, its current leaking across the tube from cathode to anode that makes that frying pan sound