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Ah, but that was 1999; we don't party like that any more.
why have a buffer before the INA103 at all?
It has a transistor front end which then goes into an INA103 instrumentation amp which then goes into the tube stage (6418 submini power amp pentode tubes) and after the tube stage it goes into a NE5532 for creating a ballanced output...
I was going to use it as an extra gain stage because I don't get as much gain out of the INA103 as I would like...
I am such a newbie I had to look up the difference between the two and still don't really understand.
The specified input resistance is around 300K, if I remember correctly.
Well I have allready built one using the INA103 with the NE5532 and it didn't provide very much gain (maybe 50 dB).
The transistor front end actually has as good or better noise figure than the INA103.
Yes this Project is probably way over my head but I figured that this is the best way for me to learn in a Hands on way....Poeple here keep telling me "This is DIY so don"t ask us Just do it your self and find out" so I am trying not to ask Newbie questions and rather just jump right in and try to learn for my Mistakes
>The tubes of course don't care what frequency they distort
I would try setting the gain on the INA103 for 1.
If you try to increase the gain on the output of the chip--as shown in the data sheet--you will uncover one of the INA103's major shortcomings: a wimpy output stage in its instrumentation amp architecture.
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