Re: VTTC, sputter or not?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <FutureT-at-aol-dot-com>

In a message dated 9/29/02 5:05:06 PM Eastern Daylight Time, tesla-at-pupman-dot-com
writes:


>
> So is it correct to assume that grid block coils need to be fed B- to the 
> cathode via a diode?  Or can you use AC and let the tube rectify and still 
> use a grid block circuit.


Steve,

Grid block (sputter mode) coils do not need to use a diode,
raw AC is fine.
Any tube coil can be made to run in the grid block mode by
using a large enough value of grid leak capacitance and resistance,
to give a long time constant.

John