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Re: [TCML] Re: having problems with vttc tuning...
In a message dated 3/16/2008 3:54:07 P.M. US Eastern Standard Time,
hi all, thank you for your answers.
i tried to do everything you suggested but nothing.
i tested the tube, no short between filament and grid
and between grid and anode. so i assume the tube is ok (!?).
what about grid leak resistor, maybe 1400ohms is too weak?
do you thing that trying with bigger one will work?
vttc steve uses a 10kohm grid leak resistor...
i doubled the mot also.
The 1400 ohm resistor should at least work even if it doesn't work
perfectly. If you disconnect the grid connection to the tube, and
then run the coil, the tube plate should get red probably....
depending on the type of tube. Is this an 833A tube you're using?
If the tube plate doesn't get red, it may have low emission, or be
dead or something. I'm assuming the filament lights up correctly,
and that you verified correct filament voltage on the filament?
Does the coil draw current? Maybe you have a bad capacitor
or something shorted, or incorrect wiring. I assume you copied
an existing coil, or used JavaTC to figure out the primary tune point,
or proper tank cap value for proper tuning. But since the fluorescent
tube held near the primary doesn't light, this means it's not even
oscillating at all, so there's something very wrong, I don't know what.
I guess you're using the level-shifting power supply concept with
the HV diode and capacitor? There's no staccato feature installed, right?
Maybe the HV diode is facing the wrong way? (wrong polarity?). If
you built the staccato feature, you should first get the coil running without
the staccato. Just jumper across the triac or scr with a wire, or remove
the triac or scr and put a wire in it's place. You're not using a
304TL tube are you?
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