Audio Research Refernce 75se

@mike30 The best advice given so far was from @ghasley 

 If you are dead set on that direction, you might reach out to Paragon as they likely have some ref75se’s new in box for a little more than you are looking at preowned. It would have a warranty and it is an end game amp.

@jetter

I wish I could.

I’m not from the US and I’m limited.

talked to the owner of the Ref75 se he connected it for 5 hours in seperate place and he said there was 0 noise after 4-5 hours of running. anyway im taking it for a verfied ARC mechanic to check it out. then im gonna do a sound test compare to the VX-5 twenty and choose 1 :D

@mike30 It sounds like you have your bases covered. Have fun!

But be careful.

Ask seller if it possible to look inside…so you could figure out where the buzzing comes from….  buzzing could come from one of the warming up tubes… if so that is not a problem at all. 

De-lamination of the transformer is very likely. I owned a Counterpoint 5000 preamp years ago that started to develop a mechanical buzz that didn’t come through the speakers. It turned  out that this was a known problem with this transformer. And it was not a cheap Chinese unit, but a high end made in USA transformer. Sh_t  happens!