Hi guys, I am having a problem with my Aguilar db680... I live in Israel and have switched it to 240V. at first there were no problems but in the last couple of years i am experiencing problems with this unit. Theres this "swoosh" noise , hard to explain so i recorded just the noise - attached below. I put the gain on max so the it will be easy to hear but also at normal gain it is unusable. I turned the knobs which adds more noises at the relevant frequency : Bass , 400 Hz , 1.5kHz, Treble, Bright, Deep ++/+ , and Active/Passive switch. NOTICE: there are popping sounds so don't listen to this loudly. I have changed all the tubes which didn't help... I have contacted Aguilar but because i am far away there was nothing they can do. I have serviced this unit before at a very accomplished local tech (http://www.signal-audio.com/index.htm) , but am still suffering from this noise. Has anyone any idea what is this noise and how can i fix it ? have anyone encountered this problem before ? would a local tech be able to fix it ? should i just throw this piece of garbage ?