georgehifi
Responses from georgehifi
| Lightspeed Attenuator - Best Preamp Ever? Hi guys, as I have found out input switching is almost as detrimental to the sound quality as a volume potentiometer, this is why I always recommend a separate good quality input switching unit so you can still go direct when you want to bypass al... | |
| Lightspeed Attenuator - Best Preamp Ever? 2: Never had any problems with the ldr side, as my prototype is still as it was when new and that's 7 years now powered 24/7. When I say in the instructions to leave the Lightspeed Attenuator at 1/2 volume when leaving it powered up and not listen... | |
| Lightspeed Attenuator - Best Preamp Ever? Banquo363Am I right in believing that non-ideal impedance match between phono stage and LSA results in a attenuation of the high end? Perhaps it hasn't bothered me because of my old ears?Banquo363No, the slight impedance (resistance)mismatch you h... | |
| Lightspeed Attenuator - Best Preamp Ever? If I remember Batalok I think you maybe one of many I may have said the input impedance was a bit low around 30K and suggested that any competent tech could raise it up to 68k or so with 1/2hr work and a 5c resistor. Cheers George | |
| Lightspeed Attenuator - Best Preamp Ever? Banquo363 The 1.2kohm for the phono is very high and should not be an "ideal" match with the Lightspeed, but it will not be harmful to anything either. I have quite a few customer with dac's and phono stages with output impedances this high with t... | |
| Lightspeed Attenuator - Best Preamp Ever? The HF filter that capacitance of an interconnect that is 300pf for it's total length when with the Lightspeed is 76khz -3db200pf is 114khz -3db and for 100pf it is 227.5khz -3db.As you can see even the 300pf is fine as it is still only -3db at 76... | |
| Lightspeed Attenuator - Best Preamp Ever? Ok some normal hifi speak for a change, I never been a big fan of balanced as 90% of the time to make them balanced a lot of the equipment manufacturers just bundle in more opamps into the single path to make it balanced input or output, very few ... | |
| Preamp for Pass Pierre1976: So which tube preamps are great with Pass?Pierre1976:Most Pass amps have very low input impedance Pierre, for a good match this dictates the necessity to use a preamp that has very low output impedance in the order of 100ohms will be a... | |
| Lightspeed Attenuator - Best Preamp Ever? 09-21-11: Agear: 1:George, is the diode effect measurable? What does it do of rather what does it distort?2: Paul asked the million dollar question above: what are the effects of gain? Does it produce distortion?3: I did try the LSA with a SS amp ... | |
| Lightspeed Attenuator - Best Preamp Ever? You have no constructive critisism Teajay, all you try to do is to get this thread shut down with your personal attack. Not once have I attacked you personally just questioned the Ohms Law compatibility of components in your system that have not b... | |
| Lightspeed Attenuator - Best Preamp Ever? I take what you've found out onboard Tony. I can safely say a cap on the output will not change the output impedance of the tube in the audio band for the better (lower). And a resistor would also not change it for a lower impedance, only for high... | |
| Lightspeed Attenuator - Best Preamp Ever? Yes I too received it today, and I need to tell all, before any assumptions are made, that Sam Tellig (Tom) purchased one at full price over 2 years ago, before I had any idea that he was going to review it. And just a couple of weeks ago one was ... | |
| Lightspeed Attenuator - Best Preamp Ever? Like I have always said Tony, it will work and sound ok with no damaging side effects. But the source should be at least 3 x or more lower output impedance than the the load. I imagine then it could have sounded even better. Now can you imagine wh... | |
| Lightspeed Attenuator - Best Preamp Ever? This is the output description "The 12AU7 tubes are on the back panel virtually bonded to the output connectors."This is where the solid state part is used "It uses a solid-state analogue switch for input switching and an analogue solid-state volu... | |
| Lightspeed Attenuator - Best Preamp Ever? Hi Tony,this is what a cascode 12AU7 will be judging by the tube gurus. 33k is not bad so long as the poweramp is 100k or more. What was the input of the power amp used at the CES/RMAF.Cheers George |