atmasphere
Responses from atmasphere
| Tubes/SS Power Amps? It was a joke. If you run a real high voltage on tubes they can emit X-rays. | |
| Tubes/SS Power Amps? Generally speaking class D amplifier modules are less expensive. I have a 100 watt/channel module that cost $25 each in low quantities. It is the size of a pack of cigarettes, including heatsink, input/output connections and power supply connectio... | |
| Why should you need a power supply for preamp? The outboard power supply allows one to keep noisy transformers, rectifiers and the like outside and away from the preamp unit, which might have high gain circuits in it that might be quite sensitive to such noise.An outboard supply is generally s... | |
| Is soundstage just a distortion? Soundstage is the result of two things- good high frequency response and good phase reproduction (low phase shift). If both are correctly reproduced side information that appears to be beyond the spread of the speakers is normal. The Soundstage co... | |
| Bass leaves after amp warms up? Fishing, I'm pretty sure I suggesting removing the power conditioner on page one.The problem with most power conditioners, whether passive or active, is they force you to use a common power cord. If you get a voltage drop over that cord, it will r... | |
| Can I tweak L-R balance by differntial biasing? Swampwalker, yes, whoever wrote that is mistaken. Reducing the bias may actually get you a couple more watts, rather than less, as the B+ voltage may rise with the reduced quiescent current. But you would also have more distortion...Csontos, It so... | |
| Less than top line reel-to-reel worth it? I've been into Ampex pro audio machines for about 40 years now. I think I have had the same electronics (351) for about 35 years. They have been rebuilt three times.The old Ampex stuff is pretty bullet proof, not as nice looking or as easy to oper... | |
| What component is responsible for dynamics ? Much as I appreciate the very best high-end audio can do, it cannot and will not ever be mistaken for a live performance, even in a world class system set up correctly in a world class space - one could tell the difference instantly.Learsfool, con... | |
| Bass leaves after amp warms up? Fishing's girlfriend hears the same differences. So there should be no doubt that its a real phenomena. | |
| Tubes/SS Power Amps? Orpheus10, just FWIW if you think we can't see the frame rate at a movie theatre, go see the Hobbit and then go see the HFR (High Frame Rate) version of it!One thing that Class A tubes have over Class D is bandwidth. How about full power -1/2db at... | |
| Can I tweak L-R balance by differntial biasing? No worries- if the bias is set correctly the amp *should* have the lowest distortion for the class of operation it is designed for.For example if an amplifier designed for class A is overbiased or underbiased, the distortion will be higher. There ... | |
| Bass leaves after amp warms up? Fishing, Have you tried putting a fan on the amplifier?Based on all that we have discussed, it does seem that heat plays a huge role. The fan should be able to cool the amp's heatsinks. | |
| Bass leaves after amp warms up? Al, 0.7 db across a spectrum can be quite noticeable to the ear, whereas on a sine wave is undetectable.You might normalize the two tracks, invert the phase of one and play them simultaneously, then you could hear the 'missing' bass. Csontos, I us... | |
| Tubes/SS Power Amps? We've been looking at class D for 9 years now. We have certainly thought about it. The preamps we make now would work fine with any Class D amp.The concerns we have had are: is class D a threat to our tube technology? Answer, yes, although not wit... | |
| Bass leaves after amp warms up? Csontos, you may have missed the post where Al found out that all three amps have bipolar output devices.My understanding of bipolars is that the hotter they get, the more current they pass- which leads to more heat. This is why they have to have ... |