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Dr. Gary

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  1. Gee....I didn't know that electrons had eyes and could read. Now on a serious note...........if the objective is to create a power source having a constant, low impedance over a wide frequency range, paralleling different-valued capacitors not going to achieve that objective. In fact, it is going to do the EXACT OPPOSITE. Specifically, it is going to create a power source having an impedance that varies widely as a function of frequency. Worse yet, it is going to create a power source that has near infinite impedance in the frequency regions that exist between the self-resonant frequencies of the individual capacitors.
  2. The RIAA equalization in the Bravura is NOT either directly coupled or passive. The phono section of the Bravura, which was designed by John Tuttle, consists of a single op-amp that is used in a non-inverting configuration with the RIAA equalization in the negative feedback loop of the op amp.
  3. Your assertions that 1) the green wires are add in parallel with the board traces, and that 2) it was Bob Fulton who added them are both FALSE. The component (top) side of the board is ALL ground plane. Because of this, all trace connections between components are made on the underside of the board. Because of the spatial constraints, it is not possible to run, on the underside of the board, the appropriate separate ground traces to the potentiometers, to the shields of the input and output cables and to a few of the circuit components. The green wires provide those necessary ground connections. They are a necessary element in the design and construction of the Bravura and are NOT part of a modification that was added after the fact by Bob Fulton. During one of the many phone discussions that I had with John Tuttle when he was designing the dual-mono version of the Bravura, he mentioned in passing that a three-dimensional approach was needed to properly implement the circuitry of the Bravura. In other words, a two-sided circuit board was insufficient. At the time, I wasn't aware of what it was to which he was referring. In retrospect, it is clear that he was referring to the need for the green wires.
  4. New Members 0 3 posts Report post Posted Thursday at 03:34 PM Date: Sun, 23 Feb 2020 15:33:02 -0800 To: Jeffrey Medwin <drlowmu@gmail.com> Subject: Au revoir.....and a warning Regrettably, the time has come for our recently rekindled romance to come to an end. Accordingly, you can continue to believe in sonic ghosts and magical cures, and I will continue to believe that you are totally nuts. That having been said......and now on a serious note...... I offered to take a look at your Bravura because I assumed (correctly) that you were not responsible for its malfunctioning condition. However, even though your Bravura has been repaired and is now functioning properly, rather than simply enjoying the spectacular sonic performance that it has to offer, you seem to be intent on d****ing around with it in an attempt to improve its sonic performance. Aside from the fact that from a technical perspective you don't know what you are doing, I want to leave you with the following warning: ......If in the process of d****ing around with your Bravura, you **** it up, don't come to me for help because from here on you are on your own,
  5. Date: Sun, 23 Feb 2020 15:33:02 -0800 To: Jeffrey Medwin <drlowmu@gmail.com> Subject: Au revoir.....and a warning Regrettably, the time has come for our recently rekindled romance to come to an end. Accordingly, you can continue to believe in sonic ghosts and magical cures, and I will continue to believe that you are totally nuts. That having been said......and now on a serious note...... I offered to take a look at your Bravura because I assumed (correctly) that you were not responsible for its malfunctioning condition. However, even though your Bravura has been repaired and is now functioning properly, rather than simply enjoying the spectacular sonic performance that it has to offer, you seem to be intent on d****ing around with it in an attempt to improve its sonic performance. Aside from the fact that from a technical perspective you don't know what you are doing, I want to leave you with the following warning: ......If in the process of d****ing around with your Bravura, you **** it up, don't come to me for help because from here on you are on your own,
  6. Much like polishing a bent mirror, you can put lipstick on a pig, but it's still a pig.
  7. The polishing job that you did on the brass face plate reminds me of a pertinent comment that the late John Tuttle made to me nearly thirty years ago during one of the many phone conversations that I had with him when he was in the process of finalizing the design of the dual-mono version of the Bravura preamp that you recently blew up. Because of the time that has gone by, combined with my advanced age and deteriorating memory, I can't quote Tuttle's comment exactly, but the gist of it was that all that folks like you are doing amounts to nothing more than polishing a bent mirror.
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