Greetings... I have an SB200 with the grid current meter resistor open. ( don't remember "R" designator, but the resistor is 1.5 ohm, 1/2 w. and the grid current meter reads voltage drop across this resistor ). My questions are : How critical is this value? Must it be carbon comp or will wire work in the RF circuit? Thanks in advance. 73, Tom AA1NZ