atmasphere
Responses from atmasphere
| Anyone Know Where I should Look to Figure Out This Hum? @dhcod That isn't a ground loop or bad ground. Those both produce a buzz, and what you have here is a hum. Its a defect (like a damaged filter capacitor or bad solderjoint in the power supply). So the preamp is going to need service. | |
| How does the input impedance of an amplifier effect it sonically? As for the amplifier input impedance is 20HZ also the number I should look for when a specific input impedance is given. If I understand correctly, 20hz is where the amplifier will show its minimum value and any higher specification (frequency... | |
| Nixie tube amplifier project - unfinished - help! @kjmelvin I run a small tube amp manufacturing company called Atma-Sphere. If you want, send me a photo to my email address. You can find that on the contact page of our website www.atma-sphere.comMaybe we can get to the bottom of this. If you h... | |
| Thoughts on Tube vs SS amplification for Sony SS AR1s Purely out of curiosity and to gain further knowledge my question simply is how does the 14 watt (Tubed) Luxman accomplish this feat?If its output impedance is low enough, it will make its full power into the lowest impedance of the speaker (BTW ... | |
| Pre amp and Power amp advice needed A very tube-friendly speaker!Why bother with EL34s and the like when there are triode amps out there with plenty of power? Given the efficiency I would recommend something with about 60 watts in most rooms. | |
| How to accurately gauge speaker sensitivity to match with tube amp? For this reason, the argument that only speakers with an impedance of 8 ohms or higher will work on tubes is incorrect. There are many tube friendly speakers whose nominal impedance is 4 ohms. If the speaker’s impedance is relatively flat and c... | |
| Nixie tube amplifier project - unfinished - help! The tubes that I can see/find easily are labeled "Philco 7P" and "Sylvania 6DQ4." @kjmelvin The Sylvania tube is a rectifier in the power supply and does not amplify. The 7P is not the tube type of the Phillips tube- that seems to be a house nu... | |
| How does the input impedance of an amplifier effect it sonically? @hiendmmoe If the manufacturer can't provide that 20Hz output impedance value, you probably should look elsewhere! The 20Hz value can be a multiple of the 1KHz value; it could easily be 10x the value at 20Hz. We got around this issue with our pre... | |
| Thoughts on Tube vs SS amplification for Sony SS AR1s In a follow up post I specifically mentioned amplifiers capable of doubling their power as the speaker impedance is halved. This would demonstrate high current output/delivery from the amplifier. This is what some have said the Sony speaker re... | |
| Nixie tube amplifier project - unfinished - help! I wonder if he was using a Nu-Tube from Korg? That tube is based on VDF concepts. IIRC Nelson Pass makes a kit preamp using that tube. At any rate this does not sound like it would be all that challenging to sort out. | |
| 2 different Bedini 150/150 Mk II Amps You have to be careful here- when the amp is one taking any readings in it can end in disaster if a probe slips! These instructions make perfect sense to a qualified technician- which is where you should take it! | |
| How does the input impedance of an amplifier effect it sonically? That depends on what is meant by 'struggling' as there can be several issues. One is that the amp needs a lot of input voltage and this has nothing to do with the input impedance. The other is that if the preamp has an output coupling capacitor, i... | |
| 2 different Bedini 150/150 Mk II Amps Sounds like it to me. | |
| Thoughts on Tube vs SS amplification for Sony SS AR1s My point is if you look at the Sony SS AR1 speaker measurements they are as George and others have rightly noted, a ’challenging ’ speaker load given its impedance curve and phase angle characteristics. Armed with this knowledge the last thing ... | |
| Thoughts on Tube vs SS amplification for Sony SS AR1s One has to ponder that there are things listeners can clearly hear that (At least for now) aren’t being measured or maybe can’t be measured. In this case I don't think so. The Luxman is able to behave as a proper voltage source within certain li... |