atmasphere
Responses from atmasphere
| 300b lovers The difference is Class D switches at 100 kHz or higher, with pulse width translating to signal level, while Class A is non-switching and like a preamp, fully analog from start to finish. @lynn_olson most quality class D amps switch at 500KHz o... | |
| Amplifier circuitry-4 ohm vs 8 ohm Implied, but so far not stated specifically, is that the output tubes of an amplifier need to see a high load of several thousand ohms (the exact value depends on the tube and amp design.) If you run an output tube straight into a speaker, wheth... | |
| Atma-Sphere Class D… Amazing Are you still planning to build a version with somewhat higher power output? We started with 100 W into 8 Ohms, 200 into 4 simply because if you really need more power than that your speaker is impractical. The exception seems to be ESLs like t... | |
| Atma-Sphere Class D… Amazing Thanks for any further thoughts based on your extended experience with the A-S Class D amps. @sdl4 There is a review in this month's (June 2023) HiFi+ magazine. The reviewer had given us a very nice review of our M-60 triode OTLs about 2 years... | |
| Is there a 300B type amp out there with some WATTS behind it? I understand one way to tackle the issue of using SET amps is with high sensitivity speakers. Is there a 300B or something that gives you that same sound out there with power so you have more speaker options? @audiovicker You have put your fi... | |
| Amplifier circuitry-4 ohm vs 8 ohm However, I do recall that the late Roger Modjeski (RAM Labs Music Reference Audio) advocated “light loading” of amplifiers. @charles1dad Roger's amps were designed so this technique could be used. Most amps are not. Roger's amps also used feed... | |
| Amplifier circuitry-4 ohm vs 8 ohm What if the speaker has a nominal impedance of 6 ohms? Which tap (4 or 8) should be used since the load is right in the middle of the two windings? @dspringham Try it on both. If you have access to the impedance curve of the speaker, look at th... | |
| Amplifier circuitry-4 ohm vs 8 ohm The single amplifier at some point splits the signal going into either one of these Ports. What differences are there in the circuitry? Maybe this will help me better understand the difference between these two taps. I believe 4 ohms is a wider ... | |
| Amp question with size constraints I had assumed that Class Ds would be a step down though that increasingly seems to be a prejudice. It is, but started from class D amps being poorly executed 10-20 years ago. Things have improved- class D amps are now able to sound as good as t... | |
| 300b lovers There is a simple and inexpensive means of dealing with heat due to amplification. Ducts in the ceiling above the amplifier(s) can be added, along with dryer style hose the connects via a squirrel fan to the outside. This can be installed for a fe... | |
| Shipping Alternatives- US to Switzerland @thebingster Try ipsparcel.com They aggregate Fedex, UPS and DHL and often have very good rates, better than you can get thru those carriers otherwise. | |
| 300b lovers What are some amps you’ve heard with high feedback that you’ve enjoyed? I’ll have to check them out. I’ve seen the measurements for the Purifi and its distortion is incredibly low, to the point it’s at the limits of what the AP analyzer can measu... | |
| 300b lovers Maybe. Except that there are things we cannot measure. @donsachs That was true back in the 1980s. It really isn't now. Measurement technology has really advanced in the last 40 years! Its the distortion of any amplifier that is its 'sonic sig... | |
| 300b lovers I hate the sound of solid state devices. @donsachs There are now class D amplifiers that have a distortion spectra that if you had one on the bench you would be completely convinced you were measuring a really well-behaved triode tube amplifier... | |
| Wanted manual/instructions for the Joule Electra LA-100 Mk III plus the OPS-1 @jakej Contact Richard at Signature Sound in New York. He is doing Joule Electra support. (315) 622-4137 |