This is a really nice condition Amber 3501a that I bought a few years back to fill a gap while soing some maintenance on my other analyzers. The previous owner adapted this unit for his convenience when working in the field and at his shop on audio amplifiers. He changed the BNC generator output jack to an RCA jack, and added banana jacks for easy hookup of amplifier outputs. To switch between channels for taking measurements, he changed the front grounded/ungrounded input switch to switch between banana jacks (Input 1 and Input 2).
Here it is testing a buffer/preamp with very low output showing good sensitivity. I've used it for testing a few Adcom amps and it worked well, but as you can see from the unit beneath the Amber, I've moved into a different type of analyzer, and still have my early HP analyzers, so this is ready to move to the next person who wants a quick and easy way of testing functionality and performance without going into a more expensive system, or a more fiddly/time consuming approach like a soundcard and REW. Actually, I have those systems as well, and each has its own place. I find these self-contained distortion analyzers to be best for initial function/performance testing of units I'm evaluating prior to and after repairs.
When I bought it I cleaned all the rotary switches and board connections, inspected the boards and terminations, tightened various fasteners, and re-painted the front corner brackets.
How about $350 plus shipping and PP fees (CONUS only, please)? I can provide two PDF manuals for the buyer - the slightly different 3501 and for this 3501a. Thank you.
Here it is testing a buffer/preamp with very low output showing good sensitivity. I've used it for testing a few Adcom amps and it worked well, but as you can see from the unit beneath the Amber, I've moved into a different type of analyzer, and still have my early HP analyzers, so this is ready to move to the next person who wants a quick and easy way of testing functionality and performance without going into a more expensive system, or a more fiddly/time consuming approach like a soundcard and REW. Actually, I have those systems as well, and each has its own place. I find these self-contained distortion analyzers to be best for initial function/performance testing of units I'm evaluating prior to and after repairs.
When I bought it I cleaned all the rotary switches and board connections, inspected the boards and terminations, tightened various fasteners, and re-painted the front corner brackets.
How about $350 plus shipping and PP fees (CONUS only, please)? I can provide two PDF manuals for the buyer - the slightly different 3501 and for this 3501a. Thank you.
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