atmasphere
Responses from atmasphere
| Flat copper speaker cables Check our Goertz Alpha-core they make flat ribbon cables both copper and silver. Goertz used to make a product that had 4 copper ribbons in mylar side by side. We used that to sandwich the 4 conductors, alternating the + and - connections on... | |
| surface noise reduction Yet I might invest in a better cart one of these days. @boxcarman If you are listening carefully and without bias, I think you'll find that the ability of the arm to track the cartridge correctly is far more important than what cartridge you ha... | |
| 300b lovers A Mullard PP 300B works as follows: input tube direct-coupled to a long-tail pair (or CCS) of triode-connected 6V6 drivers. These in turn are connected to a PP interstage transformer with a modest step-up ratio, between 1:1.4 and 1:2. The interst... | |
| surface noise reduction @boxcarman You have two really important issues to address that were both brought up by @lewm early in this thread. The first is cartridge loading; cartridges like yours really need a proper load to sound right! If unloaded, the inductance of the... | |
| 300b lovers But many of these classic PP still sound fine! Why? Because feedback or because PP has PS noise cancelation? Feedback allows the amplifier rejection of that which is not the signal, so generally speaking, yes. I really liked the 3 6sn7 tube... | |
| Dynaco ST-70 vs Mark 3 The ST-70 has long been considered the better sounding amp. The important thing is to make sure its power supplies (including the bias supply and its rectifier) are operating properly. The often need resistors on the circuit board replaced too. N... | |
| 300b lovers The Dynaco, introduced in the mid-Fifties, took the drastic step of deleting the driver stage and its associated RC coupling, and driving the output tubes from the RC-coupled phase inverter. Although the open-loop performance was quite poor, roll... | |
| Which frequency to adjust if voices/mids give me a headache. I've done Dirac room correction and both sets of speakers still bother me a bit. These are not bright speakers I know. @wrecked Since you've done room correction the cause of the irritation may not be brightness. Higher ordered harmonics cau... | |
| Class D amplifiers. What's the future look like? Given the filters and phase shift, does class d design lend itself to mathematical modeling? Yes. Like anything else though it depends on the quality of your models. | |
| Atma-Sphere Class D… Amazing I was watching a YouTube video from REL about connecting their subs to class D monoblocks. They recommend connecting their red wire to the amp’s positive speaker post and the black wire to chassis...not the negative speaker post. I’d prefer to he... | |
| 300b lovers A current source could replace the resistor, but in practice, the performance is very similar to a current source, so it’s rarely done even in modern amps. Usually in a differential amplifier, the plate resistors are matched if both halves are ... | |
| 300b lovers @charles1dad My point was addressing a comment made earlier by Lynn about overshoot in amps employing feedback; simply that if you do it right its not a problem. The OP mentioned using Spatial Audio Triode Masters who were a dealer of ours and hav... | |
| 300b lovers I changed the load resistor to 120KOhm, and the overshoot decreased by amplitude and attenuation time. But still, there is a notable overshoot. I measured a frequency response and there is a hump +1.7dB at 35KHz. There is -3db at 19Hz and 47KHz. ... | |
| Class D amplifiers. What's the future look like? As well as other new applications of technology such as Westminster Labs sliding bias voltage Class A cool running higher power solid state amps? They may well function superior to Class D amps. The issue has been for the last 70 years and ... | |
| Speakers 10 years old or older that can compete with todays best, I digitize my turntable and use digital RIAA correction which is more accurate than any analog circuit. I am curious about this. The RIAA pre-emphasis is of course done with analog components; as a result is not the ideal but instead a modified... |