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Is 100k Ohms too much for LM386 input stage?
I am currently building a small guitar amplifier with a sub-Mini Tube preamp stage feeding a LM386 for the amplifier stage. The sub-mini tube preamp output signal is approximately 100k ohms and I was wondering if this is appropriate for the input of the LM386.
The mini-amp is in essence very similiar in design to the well known Smokey Amp. I am only building a sub-mini tube pre-amp for it because I have the tubes lying around. I am not expecting to get high quality sound and my only wish is that it sound a little better then a stock Smokey design. This amp is being design solely as a novelty with the hope that I can use it to practice with while traveling.
no, the 386 has a typical input Z of about 50kΩ, so with a 100kΩ source impedance you will lose 2/3s of the signal. And the input will be at a high impedance and tend to pick up hum and noise.
If you are going to use an IC amp, using tubes for their supposed better sound quality is not too effective.
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