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 Convert Your Records (LP's) & Cassettes To MP3 & CD's US $1.49 
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 Echo Mia 24/96 professional PCI audio interface / soundcard US $.99
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 Dared MP-2A3C 2a3 SET tube amp, new US limit Ed US $799.00
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 New Dared SL-2000A pure tube preamp,line stage US $449.00
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why is it necessary to maintain the input signal level of a frequency response of an audio amplifier?
I think you mean 'maintain the same input signal level at all frequencies' while measuring the frequency response. It's because you want to measure the gain of the amplifier at different frequencies and you can't do that if the input signal level is constantly shifting.
Doug
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Audio Frequency Generator and Tubes-vs-Solid State Amps
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