atmasphere
Responses from atmasphere
| Best Vintage tube amp / preamp manufacturer I worked on a lot when I was putting myself thru college working as a service technician. The best preamp from that time for me has been the Citation 1 preamp from Harmon Kardon. I prefer it to both the Marantz 7 preamp and the Mac stuff. I don't... | |
| 300b lovers Don, myself, and the team at Spatial intend to be on the straight and narrow when it comes to regulations ... we are not Tesla, Apple, or Microsoft, with armies of lawyers to smooth the path into new markets. To gain the CE mark (which says tha... | |
| 300b lovers Try removing the 56K load resistor entirely and give it a listen. You might like it better. Remember, with conventional signal sources, there is almost no ultrasonic content, so the ringing in the transformer is never stimulated. And getting rid ... | |
| 300b lovers The problem with two successive stages that are balanced and DC-coupled to each other is that DC drift is a big deal. A 1 volt shift on a 150 volt plate is normally inconsequential, but becomes a serious concern when the grids of the following st... | |
| Flat copper speaker cables @ortodox , what @ketchup said. | |
| 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... |