atmasphere
Responses from atmasphere
| Tube amps and speaker matching Tubes are expensive power. With efficiencies less than 89 db or so, you start to need a lot of power to really make the speaker play, although there is a lot of variance due to rooms and taste. So the power rule of thumb thing is generally OK but ... | |
| Why Don't We See More High Current Electronics? Atmasphere, technically there is no such thing as no feedback in an electrical circuit and hence a zero feedback amplifier, can you quantify your statement ?Loop negative feedback is what I was referring to. I have no issues with degenerative feed... | |
| The sound of glasswear From looking at these links, neither seems to support the kind of scenario that involves a preamp. They both look like some sort of malfunction in the amplifier.Many SS amps use a protection relay or similar circuit to detect DC at the output of t... | |
| FURMAN, PS AUDIO, ISOTEK?? The Furman is a good unit as long as it is not overloaded. It is used a lot where AC voltage is variable, as it will try to keep the line voltage stable (it has a circuit for switching taps on its isolation transformer).It is most often used in st... | |
| Why Don't We See More High Current Electronics? Irvrobinson, he wants something that doubles power as you cut the load impedance in half. But I don't like feedback (human hearing perceptual rules meow meow...)... | |
| Why Don't We See More High Current Electronics? Here's my vote: a zero-feedback transistor amp that behaves as a voltage source, from Ayre.http://www.ayre.com/mxr_details.htmInput impedance is very high- any preamp will work with it. | |
| The sound of glasswear Tubes were supposed to be obsoleted about 50 years ago. Funny thing- in most industries they are, but not in the field of audio. Must be a reason, huh? | |
| Calculating total capacitance Yes, I think you will find it easier to hit that 'sweet spot'. Please report back on your findings :) | |
| loading resistor question Yes, the resistors themselves do make a difference! | |
| Help Diagnose Tube Preamp Problem Skf3636, the deoxit gold is good stuff, but should be used sparingly, particularly in tube gear! If I were you, I would pull all the tubes out, and carefully wipe down the sockets and bases of the tubes to remove excess chemical. Too many times, I... | |
| Why Don't We See More High Current Electronics? Foster_9, I think there was a typo in your last question- the input impedance you are looking for is 50K ohms (50,000 ohms) or 100K ohms.Most transistor amps, FWIW, seem to be closer to 10,000 ohms input. | |
| Why Don't We See More High Current Electronics? The first is simply the lack of citation of any historical or scholarly references, or measurement data. This need not be . . . I think that Atmasphere could actually support his design choices much better by a properly researched, documented, and... | |
| Why Don't We See More High Current Electronics? Yeah, we've had this discussion before. Same old same old. Lots of assertions, but no supporting data. Negative feedback is bad because it causes time-domain distortion, distortions we can measure aren't importantOf course there is plenty of suppo... | |
| loading resistor question Rodman99999, thanks for pointing that out. If I read that ad properly, it still sounds like there can be an issue with RFI caused by the tank circuit I mentioned.However if this preamp is immune to RFI, the loading of the cartridge will not be fou... | |
| Which speakers to get for a Very Large Room. If they are in the budget, the Classic Audio Loudspeakers do the job quite nicely. Efficiency is 97-98 db, impedance is 16 ohms and the low frequency cutoff is 20 or 22 Hz, depending on if you get the T-1 or T-3. In a room the size mentioned, one ... |