On 10 Jul 2007 at 21:31, dwight elvey wrote: > You could also put a current source instead of a resistor. > This can be made with either a transistor and s few resistors > and diode or a jfet. Uh, Dwight, we're talking "vintage" gas triodes here. If I had a transistor of any sort, why would I be messing with neons or thermionic gas triodes? Cheers, Chuck