Hi Walt - it depends.
Is it a beige colored cabinet like in the links below - newer - as opposed to the older orange cabinets ?
I would not worry about the hours since they are hospital grade. They are all used to a certain hours / time period then decommissioned - leases etc.. A wholesaler will go into the hospital and buy XX of them with varying usage. These are the sellers on ebay and the like.
If possible ask the seller to open the back panel and send you a picture of the insulation. This is the part that can start decaying on the older orange ones. Is the insulation in good condition - not discolored or frayed, some of it falling off ?
If possible ask the seller to put a load on it - hook something up to it - and verify that the internal regulator turns smoothly. On older units this can get sticky from water hardness and not being used. This is an issue but not a showstopper,as you can just close it (the regulator) permanently - this puts the compressor on full out PSI mode - and add an external regulator instead. But the external one will cost another $50.
If the insulation is in good shape and the regulator is good then the $250 range is a good price. imo. They are $2500 us dollars new.
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Shipping
For shipping it’s like a floorstander speaker so needs to go on a pallet.
I would do a search on medical whole sellers in your area. You might find one available locally or within driving distance and save on shipping.
As I am in Canada..... I got soaked on shipping costs for my 2000 plus duties/customs - the shipping ended up costing 4 times the price of the great deal I got on the unit. But my 2000 was like a ... picture a Barn find, very few hours and even the 12 volt battery was showing a full charge. But I am still using the 3500 - keeps on ticking. 8^0
The Compressor/Pump can be as we know an audiophile journey on its own. We have discussed here how to test ones pump.... for noise going into the audio system.
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Timeter Aridyne System- how it works - from their site
The system works by drawing and filtering ambient air through the air intake. The air is compressed to 80 psi and then cooled via the internal cooling coils which condense the moisture from the compressed air. The moisture is collected in the condensation trap and automatically drained into the evaporation tray. The cool, dry air is then regulated to 50 psi and delivered to medical devices through multiple outlets.
the 3500 model is $2500 us dollars new
https://www.global-medical-solutions.com/Allied-Healthcare-Timeter-Aridyne-3500-High-Flow-Medical-Ai...the 2000 model is $3000 US dollars . It also has battery backup - so your turntable will slow down but your tonearm will not be affected saving the record from skips in a power loss situation.
https://mfimedical.com/products/allied-healthcare-timeter-aridyne-2000-medical-air-compressorThis article shows the differences between them
http://www.alliedhpi.com/images/z10-00-0081.pdfCheers Chris
