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DC filaments are standard on all preamps now.
Then it's not an upgrade. If the preamp was called NSPre then you did this as a production upgrade it could be the NSPre.1 or some sort of name change. Right?
I think I fell into a rabbit hole. What does capacitors have to do with lag in a feedback circuit?
It's somewhat ironic that while Blair, as a relatively new manufacturer, claims that there is no difference between say, a polyester cap and a teflon cap (assuming the same value), other, more established manufacturers (Audio Research, conrad johnson, Audio Note, hell, even B&W has discovered the sonic advantages to Mundor caps) have been converting to better components. So who is right? Yes, there are others who share Blair's philosphy - Frank Van Alstine and Roger M. come to mind, but again, they are niche manufacturers (granted, very well rgarded niche manufacturers) who more than likely don't have have either the time,inclination, or cost incentive to play the component game (some of these suckers can get expensive!) Although I seem to recall that Jeff Behr has modified Rogers EM7 amps with positive results. That B&W has done the research and concluded that the Mundorf oil caps are sonically the best for their diamond tweeters is enough for me to accept that here are sonic differences between components. So to me it boils down to these questions: 1) Blair, why do you beleive that components don't make a sonic difference? 2) Have you experimented with the exotics? 3) Is it possible that some circuits are more sensitive to upgrades than others?4) Are all the other rather large and successful manufacturers spewing marketing bullsh*t?5) Are all of the field reports delusional?6) Does anybody really know what time it is?
Feedback loops have lag, it is inevitable. That lag has to have inhospitable consequences. They are minute in most cases. The feedback control is set where the best sound is obtained. While a song is playing, the feedback can be adjusted to where it sounds best. Measurements do not have to be taken and there is no way to damage the amp if it's turned up too high. A very high setting will result in a muffled or totally cancelled (no sound) output.
I believe that Blair knows exactly what he is doing otherwise i would not consider being a customer and would never have ordered a tube amplifier from him. the blanket dismissal of capacitors as a upgrade path is what led to my response to Blairs comments.i wanted to share a 1st hand experience i had with exotic capacitors....WCW III
Yes, there are others who share Blair's philosphy - Frank Van Alstine and Roger M. come to mind, but again, they are niche manufacturers (granted, very well rgarded niche manufacturers) who more than likely don't have have either the time,inclination, or cost incentive to play the component game (some of these suckers can get expensive!)