atmasphere
Responses from atmasphere
| New Class D amplifiers The advantage that GaNFETs have is they have very low parasitic inductance. What this means is its easier to build a module that is low noise- and by noise, I mean the kind that radiates from the module over the air and thru the AC power. Its impo... | |
| Tube or solid state Below is the typical form of reproduction of a "square" signal by a very good tube amp, at 100Hz, 1000Hz, and 10KHz, I let you judge the massacre... @spaceguitarist FWIW there are tube amps that can reproduce those squarewaves and do it properl... | |
| Sensitivity 86 v 90 phono preamp is a Rogers PA-2. Cartridge is Lyra Kleos, .5 mv output version. I agree with the suggestions that the phono output is probably too low. I can increase it by changing the driver tubes from 12au7 to 12av7 or 12ax7; I will try that.... | |
| Which preamps use 6922/6DJ8 tubes? 6922 is a great tube for line stages - better than 12AX7 / 12AT7 / 12AU7 imo. This statement is inaccurate. The 6922, 6DJ8 and other frame grid triodes are not intended for audio. They are quite linear, which has been the attraction, but they ... | |
| Sensitivity 86 v 90 @lloydc Efficiency is 1 Watt/1 meter. With this spec, the speaker is fed 1 Watt for the measurement. With Sensitivity, the speaker is fed 2.83 Volts instead. 2.83 Volts into 8 Ohms is 1 Watt. Into 4 Ohms its 2 Watts. So subtract 3dB from the e... | |
| point-to-point or solder to CB: what should I be considering? Both approaches can work fine. The design is the issue- if the designer did not address the layout requirements, it can go south in either case. It is usually easier to update and repair when point to point wiring is used in tube equipment. | |
| Power conditioner wire gauge? Serious issue Elgar still makes those. I've not tried them to see how they compare to their older power conditioners. So I can speak to how well they will work, but I suspect they will work just fine. The ones I've seen allow you more output voltages and also ... | |
| What Does It Take To Surpass A SME V? I bought balanced Wireworld Silver Eclipse 8 interconnects and also grabbed a couple of pairs of Wireworld Micro Eclipse 8 tone arm wiring with XLR terminations with straight and SME style DIN plugs. This way I can also use the SME V or the Dynav... | |
| Concerningly loud pops in vinyl playback Thinking back I’ve certainly noticed that the Ref preamps in general (I’ve had two now) do seem to "enhance" the record surface noise a bit versus traditional attenuator-based designs like VAC. @mulveling If the preamp seems to enhance surfac... | |
| Power conditioner wire gauge? Serious issue is this Elgar thing you mention also called an AC power supply? @thespeakerdude Elgar still makes those. I've not tried them to see how they compare to their older power conditioners. So I can speak to how well they will work, but I suspect the... | |
| The 300B World The rectifier tube should be a consideration in 300B SET build. In a traditional single-ended 300b amp the current draw is constant, from idle to full power. That means the voltage drop across the rectifier is constant too. If you are hearing d... | |
| Power conditioner wire gauge? Serious issue Since the action of conditioning the power must consume some of it, the conditioners of which you speak presumably have power supplies of their own to make good the loss. @clearthinker They do. The PS Audio, if I understand correctly, employ... | |
| Is a noisy tube a bad sounding tube When I turn the gain up to maximum there is some minor tube noise I can hear when I put my ear to the speakers on side only. If its only that loud you have no worries. @tablejockey gave you good advice. | |
| Audio Research Reference 150 - buzzing input transformer Is there anything that can cause the transformer to overheat and melt inside? The noise was caused by a vibration of the plates inside the transformer. Does anyone know how hot the input transformer can get? @filipm To the first comment (so... | |
| Concerningly loud pops in vinyl playback I've put it on the phono stage for now (along with tonearm ground) BUT being a Hagerman Trumpet, it takes DC from a SMPS wall wart that's 2 prongs. So there's no connection to earth ground. So I guess that's kind of a bummer if the intention of t... |