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I try to figure out what is the cause; when it comes to suddenly loss/cut off in volume and only moderate audible hum dominated the sound in all channels. I try to measure the dc voltage in the plate of the phase inverter tube with the dmm, comm touching the ground/chasis and the other lead to...

I have problem with my triple rectifier head, the 3 channel non multi-watt model (year 2008). While playing, after for about 10 to 15 minutes it suddenly has severe volume drop, like cut off. From the cab just came out faint/little hum, when this symptom happen the guitar sound become very weak...