Hi Popper, I bought one of those AR amps new, way back when. It sounded okay, as I recall, though my system at that time wasn't as high resolution as it is today. It did, however, blow up on me for no apparent reason. AR rebuilt it at no charge and I sold it to a friend because I liked my Dynaco 120 a bit better. A couple of months later the amp blew up on my friend and AR had to repair it once more. So my sample appeared to be unstable, but I don't know if it was representative of typical production. This is one of the only amps I've owned that failed in service.
Old Acoustic Research Amp Model AU
Im looking for information on an old AR Stereo Amplifier I picked up. It has a plain Brushed Gold front panel, with 5 brushed gold knobs, all the same size, the center three are dual post knobs. the only other thing on the front is a switch for Speaker/Monitor and a red lens in the upper right hand corner for when the power is on. It says AR inc. in the lower left hand corner of the front panel. On the back are the inputs on the right and the speaker outputs (slotted screws) on the left. Also on the left are three fuse holders. Ther is no Model number on the bottom it just says "Model AU". It does have a serial number of A002806 on a small piece if tin riveted to the back. It is enclosed in a black mesh case. is roughly 12 1/2 inches wide, 8 inches deep and 3 3/4 inches high. It weighs about 20 lbs. It is in excellent condition and sounds beautiful. There are no tubes inside but i can see 4 round output transistors and a large aluminum heatsink looking in from the top. Any info you can get me on this item would be appreciated. I believe it to be made around the 1970-71 year.
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