Posted by basstub [ 130.194.13.106 ] on July 22, 2005 at 00:48:20:

In Reply to: Re: bass preamp and 6418 pentode posted by Forty2wo on July 21, 2005 at 22:37:55:

Im pretty sure I have to change both resistors. If I add 100r to the pin 3 then i must subtract 100 from the other side. This is because any change effects the filament current. In order to maintain the voltage across the filament @ 1.2v (so it still produces electrons)I must move both. As it is, pin 3 is at around 1v. By changing both resistors I may be able to move this point around but as yet Im not sure what efect that will have.
the 6418 really isnt a good one to play with:)
we learn
thanks

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