deepak Posted February 26, 2007 Report Share Posted February 26, 2007 john himself told me that they only made 1,000 pairs ("of HP-1000's"), and that it took them three years to sell all of them. however, john has also been noted as saying that the hpa-1 is "basically the same" as the ra-1 Is this true? Has anyone opened up the HPA-1? And are there schematics for the HPA-1? Danke Quote Link to comment Share on other sites More sharing options...
JBLoudG20 Posted February 26, 2007 Report Share Posted February 26, 2007 I could have sworn that I saw the inside of one once, and they were very different than those of the RA-1. I could be wrong, though. Quote Link to comment Share on other sites More sharing options...
recstar24 Posted February 27, 2007 Report Share Posted February 27, 2007 The basic circuit is essentially the same. The HPA-1 has much better build quality, with slightly better parts (caps, resistors, etc.). Whereas the RA-1 has some grain, the HPA-1 is dead smooth. There are of course better options IMO. Quote Link to comment Share on other sites More sharing options...
deepak Posted February 27, 2007 Author Report Share Posted February 27, 2007 I had a real RA-1, nice match with the HF-1. Tamed some of the high end. So no big changes in the circuit that leads us to believe one amp was tuned for John Grado's and one for Joe's? Quote Link to comment Share on other sites More sharing options...
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