atmasphere
Responses from atmasphere
| SET 45 Amp Driving Dynamic Speakers A type 45 can make about a 1 watt or slightly less running single ended.To really appreciate what they can do (which is to say, they usually sound better than a 2A3 or 300b amplifier) you actually do need some efficiency and the only way to get th... | |
| Strange Loud Popping Sounds Does the phono section ever do this when nothing is playing? | |
| Why do so few low power amplifiers using 300B have balanced inputs? ^^ He can, but 5 meters is a long ways to go single-ended, even if the cable is balanced. The adapter, if properly wired, will tie pin 3 to ground. At that point the cable capacitance will increase.But with a simple mod (which is done by adding a ... | |
| Why do so few low power amplifiers using 300B have balanced inputs? May I use a female XLR to male RCA adapter at the unbalanced amplifier input? No. That is the same as single-ended. In the residential world, you could add an XLR input, and do the same thing, but you won't get any benefit from it unless you actu... | |
| Why do so few low power amplifiers using 300B have balanced inputs? Most 300b amplifiers are single-ended. Most designers think that there is no point to adding a balanced input to such an amplifier.But the fact is there is a way to do it (without an input transformer too) that allows the amplifier to process both... | |
| Phono/preamp/amp chain. One of them tube the others SS. Which one? Just trying to understand how low level detail on tube better vs. transistor. I haven't heard 70+db gain for LOMC all tube phonostages that don't have typical hissing noise not substantial via speakers, but quite audible via headphones.The nois... | |
| Do we really need anything more than 8" woofer and 1" tweeter for medium size room? Don't remember his name, there is a French designer who makes great drivers used in some esoteric speakers. That driver goes down to about 40hz and up as far as you can see or hear. I think, it's 10" driver but not sure. The quality of that dri... | |
| Do we really need anything more than 8" woofer and 1" tweeter for medium size room? I run dual 15" woofers at home. My room is 17' x 22'; which is about an average size. They sound great in there. I don't have neighbors I can disturb so I play as loud as I want.At work, we use a little monitor with dual 6" high excursion woofers,... | |
| Loudspeakers have we really made that much progress since the 1930s? With regards to the Shearer, while solving a lot of problems of the prior art in its day, it also had problems of its own. Many of these were addressed in the Altec VOTT designs. And they were pretty well universally acknowledged as improvements. ... | |
| Phono/preamp/amp chain. One of them tube the others SS. Which one? If using a LOMC cartridge, my preference would be for an all-tube phono and line stage and a solid state amp, if the situation somehow was able to demand that one be solid state and the other tube.I would not go with a solid state phono section. T... | |
| 5% THD to .000 THD SOUND ^^Well if he has a lot of gain (and a lot of feedback), has kept RFI out of the feedback loop and is paying attention to phase margins, it should work. At the onset of clipping, the clipping behavior will not be graceful- that can't be avoided. Th... | |
| Setting cathode bias in my tube amps manually, how accurate must I be? George's comment is correct. If the amp were cathode bias, no adjustment would be needed.Are the tubes stressed by being off the bias target setting? What would be good plus-or-minus numbers be for each? Why did one designer choose manually set... | |
| 5% THD to .000 THD SOUND Atmasphere, I’d like your opinion on Bruno Putzey’s latest class D amp design philosophy. I’ve read that he once held the same view as you do regarding negative feedback producing random upper order harmonics, but he’s now broke with that orthodox... | |
| Loudspeakers have we really made that much progress since the 1930s? According to the same website that speaks of the Shearer loudspeaker the Voice of the Theater was an improvement over the earlier design (http://www.audioheritage.org/html/profiles/altec/vott.htm). The reasons why and what was done are outlined at... | |
| Atmasphere amps trustable? ^^ Thanks for that, I don't recall ever seeing that page before. It has some omissions (probably should have mentioned GAS and BAT, no mention of Graaf, who was the only Circlotron amp manufacturer to employ the Cecil Hall circuit in modern times)... |