[Amps] filament instant heating query / simple remedy

[Jim W7RY]

-Has anyone tried an approach like Carel, PC5M, with a microprocessor
-controlled soft start for the filament.  The microprocessor controls an
-optical triac driver  The triac is turned on and off over an increasing
-portion of the line AC cycle until full on is reached. His
-microprocessor program does this in 100 sec.  It is designed only for
-soft start and does not do any regulation of the filament voltage after
-full output is reached.

-David
-KW4DH

Oh PLEASE!

Just put a resistor in line switched with a relay!  This is not rocket 
science!

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-But after that initial surge, the truly dedicated obsessive must move on
-to worry about the stability of the filament voltage.

-So now our filament supply includes a hot, temperature-variable
-thermistor, connected permanently in circuit... and we are the group who
-can argue for weeks about +/- 0.1 volt.

-This should be good ;-)
-73 from Ian GM3SEK

And Ian... Yes indeed!  Let's argue about .1 volt and use a stick of 
dynamite to kill a fly!  My line voltage varies 2-3 volts (or more) 
depending on which sub station serves my house.  I don't loose sleep over 
the life of my 3-500s. 3CX800s and 8877s!!!

73
Jim W7RY