atmasphere
Responses from atmasphere
| What separate tube phono stage do you use ? Unless I have the tape machine modified. How difficult is it ?@innaIt might not be that hard. I think the big problem to vercome is not input impedance, but the overall gain. But if the input impedance is dealt with, then no need for a transformer... | |
| What is the purpose and function of a pre-amp in audio sound and production? In general, a preamp simply takes a small signal and makes it larger.In a guitar pedal, a preamp gives you more gain- easier to get some crunch.A preamp can be at any level, short of a power amplifier that actually drives the loudspeaker. All guit... | |
| DAC plus Preamp or DAC-Preamp or DAC-Volume Control ? @david_ten FWIW its possible to set up an SET to accept and process balanced signals in the differential domain- so no need for an adapter. The mod can be done to any SET and is really quite simple! | |
| Does anyone care to ask an amplifier designer a technical question? My door is open. Ralph, I measured your preamp's RIAA and it was +4 db in the bass. That is not accurate EQ. My RIAA accuracy is +/- 0.2 dB.. What interests me is how it came to be thought that preamps are harder. What designer is going around saying that? Im not.... | |
| Does anyone care to ask an amplifier designer a technical question? My door is open. The 6AS7 is a pass tube in a DC power supply. Heres a link, one has to scroll down a bit and read the application paragraph at the beginning. I dont think brand is going to make a lot of difference as they are all made for the same application ... | |
| OTL Tube Amps and Full Range Electrostatic Speakers Power increases into lower impedances!@roberjermanOne thing about ESLs is their impedance curve is not also a map of its efficiency, like it is for most box speakers.Instead, its impedance curve is a result of being largely a capacitor. For this ... | |
| Does anyone care to ask an amplifier designer a technical question? My door is open. Preamps are much easier and to me not so interestingRoger, IME this statement is false. Many good amplifier designers think that a good preamp is no big deal and then go right ahead and design a poor preamp as a result. This is totally because the... | |
| What separate tube phono stage do you use ? Who else makes tube preamps with excellent phono that could compete with Ralph's design ?@inna The problem you have is driving the input of the tape machine. If you are going to use a stand-alone phono section, it will undoubtedly have to use a ma... | |
| Please help! Tube amp issue The feedback loop using R9 and R23 may be positive (instead of negative) because you may have miss-wired the two input connectors!roberjerman and salectricgot it. This is how an amplifier like this behaves when the output transformer is incorre... | |
| Whats the FATTEST sounding Tube amp to warm up Lean speakers? I agree on #4, no power conditioners. They cannot fix a difficiency in an amplifier's design. The resistance of the series chokes adds to the resistances in the primary circuit. They add yet another power cord and socket,more resistance. Here w... | |
| Joule - Electra: Just How Hot?? The short answer is yes, there is a solution.The longer answer is you are going to have to send them to someone that knows the equipment well enough in order to engineer a proper solution.FWIW we have sorted out several JA products so far. Otherwi... | |
| What will a preamp do for me? But, according to Paul, todays controls are extremely linear. He also explained how even the best non-linear controls increase noise levels at lower volumes, and can not compete with today's digital controls.I can safely challenge the idea that... | |
| Does anyone care to ask an amplifier designer a technical question? My door is open. All OTL amps like high impedance because they have lots of voltage but limited current. Since current is the limit use the forumla Power = current squared x impedance. The amplifier max current is the same for both speakers but 16 ohms gives y... | |
| Does anyone care to ask an amplifier designer a technical question? My door is open. I'm still in the Polypropylene camp. Best thing for the money. Remember any part I buy is 5 x cost to the final buyer. So I cant buy too many $50 caps expensive resistors.For a long time polystyrene was an alternative that performed better and w... | |
| Why do amps sound different? @roberjerman,The first 5 watts or so it what most amps don't get right. With many push-pull amps, the distortion below 5 watts is rising as power is decreased! Not all amps do this though- a lot depends on the topology of the amplifier. |