On 21/02/17 04:10, Roger Parsons <ve3zi@yahoo.com> wrote:
The reason for wanting to do this is that the design of the (existing) cabinet
(and my ideosyncratic circuitry) make it very difficult indeed to change
filament voltage when all is assembled, except over a small adjustment range.
You need taps. Did you didn't wind the filament transformer? If you
didn't, how will you control in anyway? If you didn't, what's the point
of the question, or at least, what are you going to do about it?
S
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