could be drawing too much current from the circuits .it needs checking .
could be drawing too much current from the circuits .it needs checking .
I don't think so as I have just moved house and its behaivior hasn't changed in the new house... though, I do have a large mains conditioner for my computer (2200VA) I could plug the amp into that and see if it helps with the hum?Transformer humming could be due to mains DC offset.
Yes, I was wondering about loose laminations... I'll buy one of these and hook it up to it...
I don't think so as I have just moved house and its behaivior hasn't changed in the new house... though, I do have a large mains conditioner for my computer (2200VA) I could plug the amp into that and see if it helps with the hum?
As a side note, transformer heat build up should be very light under no load. If you notice that it's heating up real high then the transformer might already be damaged, or poorly designed/made in the first place.
The amp isn't really working hard - the indicators for 0.01W don't even light up but the transformer is very warm... It's a Bando transformer which I thought were quite a good make?
Does your A-8 have a mains voltage selector? Looks like there are units with and without this feature.
Also, can you take a power supply voltage reading? That would be on C1 & C2 (12000/63) with the amp idling.
I get +54VDC and -54VDC when the amp first switches on and then over ten minutes, the voltage creeps down to +53VDC and -53VDC
My A-8 has the multivoltage selector I think you can change it between 240V and 220V. It is set correctly.