atmasphere
Responses from atmasphere
| The 300B World A typical 300B SET with zero negative feedback. Frequency response .The green line represents a simulated 8 ohm speaker. @jtgofish FWIW the kind of speaker in the simulation is rarely used with SETs. They are low power and so speakers used with... | |
| The 300B World Ralph, the current draw is constant averaged over one cycle of the lowest frequency present. Otherwise the current is rising and falling with the input signal. This of course is what filter capacitors are for. If the last capacitor in the pow... | |
| Can we create a consensus list of the TONALITY of different amps/preamps/brands? @hoodjem If you want correlation, here's what needs to be done: 1) show the distortion spectra of each amp 2) show the frequency at which distortion rises. Rising distortion with frequency usually isn't a good thing. Ideally it should be a stra... | |
| Warmer class D amps for magnepan? I really think the use of a tube input stage can be beneficial with Class D power. Several makers doing that now. IMO/IME this is a Bad Idea. Why not just build a proper input buffer? The tube suggests that there's a distortion problem in the c... | |
| Recommendations for a vacum tube tester +1 | |
| Recommendations for a vacum tube tester @tksteingraber Usually when there are multiple scales for umhOs, there is a switch to go along with it. So this particular example is puzzling. Unless the meter was replaced at some point. I've used a tester like this, but the last time I saw one ... | |
| What are the audio differences you hear with turntable Mats. Atmasphere’s explanation makes perfect sense, and that’s where I’d begin if I were a beginner. But with his hypothesis as a model there is still wiggle room. @lewm Its theory, not hypothesis... 😁 | |
| We should reject hard-to-drive speakers more often in your experience ralph, when an autoformer is used to better couple tube amps with lower impedance speakers, is there a meaningful sonic penalty? @jjss49 IME a tube amp often won't deal with low impedances, particularly something like 1 or 2 ... | |
| Recommendations for a vacum tube tester The reason I asked is that the number listed on the Hickok chart does not appear to be the min and I read it was what an average new tube should test at and I wanted to verify that with experienced Hickok testers. An example…the 12at7 is listed a... | |
| We should reject hard-to-drive speakers more often Ralph, so the answer is = none. My best, MrD. Back in the early 90s, TAS did a review of our MA-1 OTL amplifier. OTLs are not known for driving low impedances. The reviewer, Steven Stone, had a set of the old Apogee Full Range speakers, which w... | |
| We should reject hard-to-drive speakers more often What tube amps ( tubes used in the output stage ) can " adequately " drive 1 ohm Scintillas ? I am not aware of any, and would like to know, so I may sleep better tonight. My best, MrD. If you use an outboard device like the ZEROs then its poss... | |
| 2023 AXPONA Show Report Would love to know how those Class D mono’s played with the Carbon 7 speakers. I thought they worked pretty well. I got a better match with the sub on the second day by angling it a bit to reduce standing waves in the room. The Carbon 7s were r... | |
| Warmer class D amps for magnepan? D is for subs and people who don’t know better, and think they are amazing,….nope,..you may think it sounds great, compare with A or AB, HUGE DIFFERENCE I've heard a number of class D amps that sound better than A and AB amps. in your price r... | |
| Considering A 20-40 Watt Stereo SET Amp I believe that Canary Audio makes both zero NFB SET and push-pull 300b amplifiers. I don’t know if anyone has done a direct comparison between these two versions. @charles1dad I have to imagine Canary has... PP amps, just like SETs, vary quite ... | |
| Considering A 20-40 Watt Stereo SET Amp I have owned two terrific push pull tube amplifiers, 100 watt KT 88/6550 and 40 watt el34. I have 300b SET mono blocks 8 watts. All three work very well with my 94 db sensitivity/14 ohms speakers. The SET is the most nuanced, open, transparent an... |