JTM45 RI noise/hum when power up

09-04-2009, 05:14 AM	#1 (permalink)
Birk Member Join Date: Mar 2009 Location: Norway Posts: 36	JTM45 RI noise/hum when power up Hi Just got a '89 JTM45 RI. It makes loud hum/noise when I turn it on, much more than my other tube amps. What could be wrong? Or is it suppose to be like this? Most of the hum goes away when I turn off standby. __________________ Cheers! Øystein

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