BEHIELS JEAN-PIERRE wrote:
The 47 Ohm at 50 Watt resistor need be in series with the primary of
the plate transformer for only 1/2 second. (after that it does no good)
> I am quit making my own start delay into a old (1988)TL922 amp.
> I made two primary transformer start up delays for : A for filament supply.
> B for hV sequential
> start-up supply.
> A little explanation about my substantial modifications concerning the
> TL922 power supplies.
> By powering-on I switch all ready a resistance of 10 Ohm/50W into the
> primary of the filament transformer circuit.
> After about 3 minutes I switch on the hV tension with in series a resistance
> of 47Ohm/50W by means of timer T1
> I mean time I also switch-out the 10 Ohm/50 W of the primary of the filament
> transformer by means of that same timer T1'
> After 5 minutes I switch-out the 47 Ohm/50W resistor of the primary of the
> hV-supply transformer by means of timer T2.
> This principle works quit very well and it is very safely for the start-up
> life time of the 3-500Z tubes ?
> But I was a little bit scary about the current (1A over 47 Ohms is 47W
> !!!)witch flows of the hV-supply
> without charge during the 47 Ohm/50W resistance was in circuit..
> Just some bleeders resistances over the hV-supply C's and over the whole
> supply as stabilization of the power hV-supply output.
> I could not believe it was about 1A ???
> That was quit a good reason to ask some question around ?
> Today I leave the whole AMP under supply for a whole day nothing happens
> around.
> May I conclude everything is normal behind my old Tl922 ?
> So a big story but I like to now some others guys opinion and experiences
> around this remarkable
> consumption of the hV-supply and measurement I made around a TL 922.
Excuse the top posting.
--
Ron KA4INM - I'm proud to be Chuck's pop!
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