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In Reply to: RE: Amplifier Modifications posted by Hawk28 on February 29, 2012 at 06:34:14
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Wouldn't the resistor have to be in series with the input to increase impedance?
Alan
The "load" the preamp "sees" is between the input and ground. That is the current path. It is possible that interposing a series resistance might increase the input impedance but since we are talking hypothetical and not specific, then it remains that the net effect has to be between input and ground.
That's it? Is that something I can do, or is it preferred that a repair shop perform this mod? Also, what would determine how high the impedence gets increased? Is it the type of resistor?
HI,
If you have to ask this question, you are in over your head. Have a qualified professional do the work. Changing the input impedance will change the gain of the amp.
Sparky
Thanks for your input, but, I already indicated that I do not have to consider modifying my amps any longer as the impedence is high enough where they should work fine with most tube preamps.
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