dhl93449
Responses from dhl93449
| Phono Section, Preamp, gain matching for noise Al:I understand what you are pointing out, but higher harmonics of the 60 Hz fundamental will be significantly decreasing in amplidtude as you get to higher orders.One way to determine this experimentally would be to observe the noise at a given v... | |
| Relocating power transformer in PS Audio GCPH Swanny:I'll email you further details. Too bad we cannot post pics on Agon. I can take some for you if you wish. | |
| Relocating power transformer in PS Audio GCPH Rrog:I can't comment yet as I am still putting my turntable/arm/cart together. I would not expect it to be worse than stock, however. The noise was such a big issue for me that I felt I needed to deal with it if I was going to continue considerati... | |
| Speaker spikes on concrete or wood floor best? I did extensive listening tests with my B&W 803ds with respect to spikes, footers, and plinths. I started with the stock 803ds flat on the carpet without stock spikes. I them went to stock spikes through the carpet (although they never really ... | |
| Nakamichi 582 issues I emailed Willy and his response was enlightening. He mentioned that "This series of Nakamichis which use the 'classic' transport are probably the best sounding machines Nakamichi ever built."However, a rebuild quote of $466 puts it a bit out of t... | |
| Connect eq to amp Sorry, don't speak French. But the photo shows what appears to be a Pre-amp out and power amp in so you can connect an external processor (like an EQ) between these. | |
| Phono Section, Preamp, gain matching for noise Al:I think he is measuring mainly white thermal noise as opposed to 60/120/240 Hz hum (via the tweeter).I found something similar with the PS Audio GCPH. That pre-amp has a low noise input stage and a gain cell buffer/output stage. The gain on the... | |
| Impressions of PS Audio GCPH I have completed my project to relocate (or actually disable) the power transformer for the GCPH.I built an outboard power supply with a similar torroidal transformer and 132,000 mfd of power supply capacitance, and disconnected the stock torroida... | |
| Need understanding on amperage Tonyw:Murphy's law should have nothing to do with it. But the amp designer should by specing the right power transistors. Safe operating area data are provided by all the power transistor manufacturers. | |
| Need understanding on amperage Yes, I have often wondered whether this claim for 60 amps by Parasound was an actual measured performance spec or strictly hypothetical "potential" capability. I guess only John Curl can answer this question.If the current limiters kick in long be... | |
| Need understanding on amperage Atmasphere/TonywiseYes, the remaining voltage would be 56 volts, and the average power delivered would be between 3600 and 3136 Wts. And it may be somewhat less because we are not accounting for the voltage drop across the output stage transistors... | |
| Impressions of PS Audio GCPH Michel:I took a look at the specs for your Mac pre-amp. I did not realize it was a large and complex AV pre-amp.It very likely uses operational amplifiers (IC op amps) for those miriad of inputs. The spec I saw showed it did not have a phono pre-a... | |
| Jolida JD9 Opamps There is a cheaper version of the 627/637 family you may wish to try. It is the 827. Very close to the 627/637 in specs, a bit better noise and a bit better distortion, and cheaper.It is only available as surface mount mount though, so you have to... | |
| Impressions of PS Audio GCPH Michelzay:In most of the research I did before purchasing the GCPH, I found no sources that really found the sound quality unpleasant or unsatisfactory. Noise/hum were common complaints in earlier reviews, but never sound quality. I am still in th... | |
| Parasound HCA-500 amp They are out of production for some time. I would call Tony at Parasound CS and see if maybe, they have some spare parts sitting around (but I doubt it).Next best source is EBay. Try to find one for sale cheap (or maybe here on Audiogon?). |