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#1
Posted to rec.audio.tubes
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RCA shorting plugs
Hello,
I have a C22 preamp and it has RCA shorting plugs in the Phono 2 inputs, the Tuner 2 inputs, the tape head inputs and the MIC inputs. Are these shorting plugs necessary and should they be used in all unused RCA inputs jacks? Thanks for your help, Edward |
#2
Posted to rec.audio.tubes
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RCA shorting plugs
On Dec 10, 12:46*pm, "Edward Morris" wrote:
Hello, * * I have a C22 preamp and it has RCA shorting plugs in the Phono 2 inputs, the Tuner 2 inputs, the tape head inputs and the MIC inputs. *Are these shorting plugs necessary and should they be used in all unused RCA inputs jacks? Thanks for your help, Edward They *should* be used on any head-amp input (tape head, mag. or MC phono). There is no reason *not* to use them on other inputs. Peter Wieck Melrose Park, PA |
#3
Posted to rec.audio.tubes
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RCA shorting plugs
Edward Morris wrote: Hello, I have a C22 preamp and it has RCA shorting plugs in the Phono 2 inputs, the Tuner 2 inputs, the tape head inputs and the MIC inputs. Are these shorting plugs necessary and should they be used in all unused RCA inputs jacks? Thanks for your help, Edward Its a good idea to leave them all plugged into inputs you don't use. They keep the inputs to the amp all biased to 0V and keep the noise low if you switch to the grounded inputs. Grounded inputs do *no harm*. And the sockets are sealed to keep out dust and pollutants that pile up inside vacant RCA sockets to cause poor connections in future. Patrick Turner. |
#4
Posted to rec.audio.tubes
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RCA shorting plugs
"Edward Morris" wrote in message .. . Hello, I have a C22 preamp and it has RCA shorting plugs in the Phono 2 inputs, the Tuner 2 inputs, the tape head inputs and the MIC inputs. Are these shorting plugs necessary and should they be used in all unused RCA inputs jacks? Thanks for your help, Edward Such shunt plugs are inserted only when needing to -measure- noise self-generated from a particular pre-amp stage, especially mics. A v good Mic hum + noise figure would be 62dB lower than a usual active ref programme level of 1mW at pro' line output. Possibly a lower o/p level on domestic circuits. Not sure about the datum found in a McIntosh design. But noise figures in gram PU and tape-head circuits are sloped, frequency- dependent because of frigged equalisation curves in the AF band either side of 1kHz. When evaluating a stage's quality, the shunt resistor should not be zero Ohms but ought to mimic the source impedance of the -relevant- transducer. I.e., 'dynamic' mic evaluator should be a 150r to 200r low-noise MO resistor - to simulate a muted! mic. Jim |
#5
Posted to rec.audio.tubes
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RCA shorting plugs
Mc being Scottish would not have provided them if they did no good. Keep
them. -- Message posted using http://www.talkaboutaudio.com/group/rec.audio.tubes/ More information at http://www.talkaboutaudio.com/faq.html |
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