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Schoeps Blue Dot Sensitivity CMC5
In article ,
Sean B wrote: Hello, How is the +5dB gain increase produced inside the Schoeps CMC5 body? With transistors. Literally, there is a small amount of voltage gain and a massive amount of current gain from the front end FET. The output stage is just dual cathode followers, producing only current gain with no voltage gain. The current gain is enormous throughout the thing... input Z is several megohms and output Z is tens of ohms. The voltage gain is minimal. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#2
Posted to rec.audio.pro
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Schoeps Blue Dot Sensitivity CMC5
Scott Dorsey wrote:
Sean B How is the +5dB gain increase produced inside the Schoeps CMC5 body? With transistors. Literally, there is a small amount of voltage gain and a massive amount of current gain from the front end FET. The output stage is just dual cathode followers, producing only current gain with no voltage gain. ** This U-Tube shows how the adjustment can be done: https://www.youtube.com/watch?v=xtcnoC620Fc ( Scott mean to say " emitter followers", not cathode ) The current gain is enormous throughout the thing... input Z is several megohms and output Z is tens of ohms. The voltage gain is minimal. ** The front end FET stage would have an input resistance about 1 Gigaohm - hence the warnings about handling that area. ..... Phil |
#3
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Schoeps Blue Dot Sensitivity CMC5
On 4/07/2018 11:03 AM, Phil Allison wrote:
Scott Dorsey wrote: Sean B How is the +5dB gain increase produced inside the Schoeps CMC5 body? With transistors. Literally, there is a small amount of voltage gain and a massive amount of current gain from the front end FET. The output stage is just dual cathode followers, producing only current gain with no voltage gain. ** This U-Tube shows how the adjustment can be done: https://www.youtube.com/watch?v=xtcnoC620Fc ( Scott mean to say " emitter followers", not cathode ) I was going to say that ! Talking about the 'cathode-world' I got a 450VDC belt two days ago from a guitar amp I am working on. Thought I had discharged everything, but obviously hadn't. Yesterday could still feel where it went in my left thumb, and out my right middle finger ! OK today. Screwdriver in left hand went for miles ! geoff |
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