georgehifi
Responses from georgehifi
| Lightspeed Attenuator - Best Preamp Ever? For Sony to quote that this unit should see 10kohm or higher as the load, says to me that one, it could be tube output (which it's not), or that it has a 1k series output resitor (which is dumb to do), or that it maybe have a capacitor coupled out... | |
| Lightspeed Attenuator - Best Preamp Ever? Happy new year to you all, the 10kohm load impedance that Sony and some other are are saying about their output, is the minimum load that this output would be comfortable (mathematically) seeing. Not it's output impedance. The only way to determin... | |
| Lightspeed Attenuator - Best Preamp Ever? What I did was to stop someone else from trying to patent it a couple of years back, what they wanted was for audiophiles to think it was their idea, but my first one was made back in 1974, using t/t and phono stages as the source, but they were n... | |
| Lightspeed Attenuator - Best Preamp Ever? Good to hear Dpac996.In your quest to sample a buffer after it, even though I believe the best buffer is no buffer so long as the impedance boxes are ticked for passive use. If you want to try an simple good stable at unity gain opamp buffer, the ... | |
| Lightspeed Attenuator - Best Preamp Ever? Dpac996 hi, yes a Lightspeed can be used to drive a poweramp that have as little as 22kohm input impedance or even lower and there is no harm to the components doing this. I have many customers that are doing just that, but I like to present the p... | |
| Lightspeed Attenuator - Best Preamp Ever? Sounds like you are one of the many who have no need of a active preamp with gain because you already have an abundance of gain from either your source, amp, and or very efficient speakers. Yes the Lightspeed Attenuator could help here, as well as... | |
| Lightspeed Attenuator - Best Preamp Ever? I ask one thing, for a single ended, low capacitance interconnect of 1-1.5mt, what are we trying to control in electronic and mathematical terms, when phrase "controlling the ICs" is used?Cheers George | |
| Lightspeed Attenuator - Best Preamp Ever? We did a comprehensive listen test with the Lightspeed Attenuator with 20 odd "golden ears" from our audio society. The amp we had was specially modded on the input that we could changed the input impedance in steps on the run while listening from... | |
| Lightspeed Attenuator - Best Preamp Ever? Yes you are correct Tony. The reason I posted them up 16 posts ago was to say that there is a problem these days with too much gain in systems, and that there is almost no reason for active preamps with even more gain again, they nearly all need o... | |
| Lightspeed Attenuator - Best Preamp Ever? Sorry plus the 21k added to the 9.3k, yes 30.3k.Cheers George | |
| Lightspeed Attenuator - Best Preamp Ever? If the Rothwell is 9.5k shunt to ground and the amp is 470k input, any preamp will then see 9.3k. Not good for any passive or tube active.Cheers George | |
| Lightspeed Attenuator - Best Preamp Ever? 10-11-11: DevilboyThanks, George. The input impedance of my amp is 470K. I can't imagine that being an issue with the Rothwell's.DevilboyNo that is not a problem, what is the problem if you go passive or tube preamp, is that while the 470k input o... | |
| Lightspeed Attenuator - Best Preamp Ever? The Rothwell attenuators work just like the Lightspeed Attenuator. That is, they have a soldered fixed series resistor with another shunt fixed resistor to ground, this forms a voltage divider just like the Lightspeed Attenuator. Except the in the... | |
| Lightspeed Attenuator - Best Preamp Ever? Different amps will have different gains, so will sources, and speakers also have different efficiencies. This will all govern where the volume control (on any passive preamp or any active preamp tube or transistor), position will be for normal li... | |
| Lightspeed Attenuator - Best Preamp Ever? There should be only one mains earth point in a system, (if you have more than one you will have a loop), all the other components will get their earth via the interconnects from the one that is earthed. Once you have two components earthed then i... |