18-09-2021, 09:26 PM
(18-09-2021, 05:47 PM)Kalee20 Wrote: ...if 1.2V operation with the two halves in parallel is used, no part of the filament will be more than 1.2V x root-2 (= 1.68V) away from the mid point, at any part of the cycle.
Too late to edit... so just drawing attention to my basic cock-up here.
With parallel filaments (1.2V total) the maximum voltage difference from the mid point is of course HALF this figure, or 0.84V.
And of course, the two ends of the filaments will be opposite polarity so will have opposite effects... the total current flow will be approximately what you'd expect from a unipotential cathode. It's only the non-linearities and any construction asymmetry which'll prevent the cancellation being perfect.
The little Ruskies should be ideal for this because the suppressor is taken to a separate pin, it can be taken directly to deck, as opposed to being tied internally as is the case with Dx96 series of B7G directly-heated valves.
