Trident A Range Preamplifier Circuit

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Gearsix

Well-known member
Joined
Sep 19, 2011
Messages
266
Location
Italy
Hello, I want to realize the second stage of this preamplifier (for line applications), and I'd like to know if someone knows if I can omit the switch
It seems to be as a potentiometer, or not?
 

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  • Trident Schematic 2.jpg
    Trident Schematic 2.jpg
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looks like a neg feedback vol control like a tele v76, so you should be able to  leave it out,

it just returns signal to the front end to lower the gain,

 
The resistor to ground sets the gain of the stage. The smaller it is, the higher is the amplification of the stage.
 
I'm afraid I don't agree with you.
The gain is determined by the ratio of R95 (10K) and the resistance of R100..105 or R109..112 on the gain switch.
This has nothing to do with R91/R92.
Impedance on the base of Q27 is fairly high.
 
Yes of course, I overlooked your entry. My answer was related to the original question, I was talking about the resistor in series with C15.
 
Thank you Nielsk!
The schematic is a little difficult to read, but it seems to be similar to the other one
I'll try to compare the schematics
 
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