atmasphere
Responses from atmasphere
| Ground Loop Issue 427 Hi Spencer, everything you mentioned just now is consistent with RF problems, how the amp behaves with shorted inputs, interconnects, etc.Some RF beads and grid stop resistors at the input of the amp might take care of it and improve the sound at ... | |
| Vandersteen Model 7s? I had breakfast with Richard at RMAF, he showed me a cone made from the new material (he had a patent pending on it at the time). It was quite impressive- amazingly stiff and super light. He said that the first breakup on the woofer was at 18KHz i... | |
| SP10 Mk II vs Mk III I think lead would be a bad move (toxic and its not very strong, certainly not rigid)- if it were me, I would design a plinth from solid machined aluminum (like we did for the old Empire 208), and then create a sandwich of dissimilar materials- an... | |
| Ground Loop Issue 427 Spencer, low level hum is a common problem if you are putting your ear to the speaker. SETs usually use a directly-heated cathode, which is to say that the filament of the tube and the cathode are the same thing. This means that you have to have a... | |
| Best matching phono stage with Zyx Universe cartr. We've been using the ZYX Universe with our preamps (MP-3 and MP-1) for the last two years. The cartridge has proven to be one of the best tracking cartridges we've heard- on the Triplanar I've yet to encounter an LP that will produce even the slig... | |
| SP10 Mk II vs Mk III Lew, you got it right. Here is the issue- somehow, you need the arm to transduce what is on the LP. In order to do that, there must be no play between the surface of the platter and the cantilever of the cartridge.To that effect, the arm must have... | |
| SP10 Mk II vs Mk III I've listened to the MkII for close to 30 years now- one of my best friends bought his new. It is very nice, but at least in the case of his machine there is one flaw that both of us have noticed- the plinth does not include the mount for the arm,... | |
| Amp advice for Sound Lab M-2's Hi Chris, the answer has to do with the 'voltage source' quality of most transistor amps. What we are talking about is the fact that regardless of load, a transistor amp will (attempt, at least, to) put out the same voltage.For example, in the cas... | |
| Amp advice for Sound Lab M-2's Rleff, if you have a set of ZEROs a set of M-60s will do OK. The big problem is the highs- M-60s don't drive 2-3 ohms all that well and that's where the ZEROs help out. | |
| Grado Reference Sonata on a Rega P5 ? An inexpensive cure for the Rega/Grado hum problem The motor and platter bearing **must** be grounded to the base of the tone arm. I have no idea why Rega does not do this, but it is effective. You do not have to shield the motor. I had to file of... | |
| Sound Labs - Opinions Ki, The older A-1s had impedances in the bass of over 50 ohms. A 500 watt transistor amp will only make about 70-80 watts into that impedance. So you were never able to tap the power of the amp with that speaker.To really get Sound Labs to sing, y... | |
| Amp advice for Sound Lab M-2's Gammastrep, your speakers are fundamentally different from box speakers as you know. The impedance curve is the result of 2 factors, neither of which has anything to do with resonance.The result is that the 'conventional wisdom' about using a tran... | |
| Tube amplifier bad caps Man, this one sure sounds like a bad power switch to me! It **does not** sound like bad filter caps! It *could* be a bad tube, but the flicker really suggests that the contacts on the power switch are arcing and permanently damaged. I would fire t... | |
| which amp is the most transparent? Orpheus10, FWIW, tube amplifier designs have evolved a lot since the 1960s, although the CJ amps (for the most part) tend to have a lot of the textbook-style circuits from that era.One area that tube amps have really improved in is the area of tra... | |
| How does OTL amp get its power? Rafael, no I do not agree with all his comments, although at at an earlier time some were true.For example, the comment1. The transconductance characteristics of vacuum tubes operated in an OTL push-pull fashion is both inherently non-conjugate an... |