Each plate amp has a different design so it is impossible for Kevin to be able to tell you if the different resistor value used would cause the problem. 2k off on one amp design could be no big deal but on another design could be detrimental. In my experience, it doesn't take much of a change in these to throw things off. I think you really need to get that resistor value correct before you do anything else. If you can't find one locally, you should be able to get one on the internet.
Good luck!
Mike
Good luck!
Mike
