The Master Of Magnetics "Steven Mark"

[hartiberlin]

"If you look in Morgan Jones book, Valve Amplifiers, 3rd edition, on page 262 he says, The inrush of current through the >filament interacts with the earth's magnetic field to produce a small kick."

Has anybody got this book and please can quote the whole paragraph, so we can read some more about this effect ?
Thanks !

[hartiberlin]

Can anyone think of an experiment to show this kick ?
I have played with lots of coils and the only short kick I have seen, when you
switch a powersupply across a coil is, that in the first new nanoseconds the voltage charges
up the coil?s capacitance and thus a very sharp big current spike is flowing into the coil to
charge up its stray capacitance. But this is just only a very short pulse.

I actually never tested,if this stray capacitance chargeup spike-current
is able to be transformed to the secondary of a transformer secondary coil...?
Hmm...
maybe if we have a transformer and we switch on the primary coil
only for less than 1 millisecond onto a DC powersupply, the
stray capacitance chargeup current spike will be transformed into the
secondary coil of the transformer and also produce there a bigger current spike ("kick") ?
Maybe this current can then via a second transformer be fed back to the first
primary coil and do a feedback loop and thus you only need a small Voltage kick to start it up ?

[hartiberlin]

Does anyone have this book ?

http://www.powells.com/biblio/4-0750656948-0

Please quote the whole paragraph mentioned.
Thanks.
Regards, Stefan.

[SMC]

Here's a link to the table of contents and the index of that book. Wouldn't it be wild if we could do OU with a tube design? :-)


http://www.amazon.ca/gp/reader/0750656948/ref=sib_dp_pt/702-0020475-1077648#reader-page

[hartiberlin]

Maybe someone scan in the pages from the transfomer section and post it here as a PDF File ?
Or is there somewhere an Ebook available from it ?
Thanks.