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Re: [TCML] Analysis of VTTC circuit



On Fri, 5 Sep 2008 12:58:12 -0500, you wrote:

>C1 + D1 + C2 are rectifying the output of the MOT.
>
>C3 + L1 are tank and primary
>
>L4 + R2 are ballast

They are there to prevent parasitic oscillations at high frequency... see
"parasitic suppressor." Don't know what freq an 833 can take off at, but
smaller bottles can have parasitic modes well into the VHF range.
>
>L2 + C4 + R1 are the grid trigger components to "switch" the tube on while energy is detected in the secondary coil

Not really switching per se:  L1, L2, C3 and the tube form an Armstrong
oscillator. R1+C4 develop a negative bias voltage on the grid of the 833 to
put it into class "C," i.e. conducting at less than (probably considerably
less than) 180 degrees.
>
>C5 - not really sure, some kind of protection for the tube?

C5 Keeps the radio frequency energy out of the filament transformer and the
mains.
>
>TRIAC + Staccato switch the tube filament on and off at selected rate.

Switches conduction through the tub on and off as desired; the filament is
on all the time.

As an aside, this is pretty much identical to the schematic of a 1-tube
regenerative receiver, except for the lack of feedback control and the
power levels involved.  Sure wouldn't want to put headphones in _that_
plate circuit and put on my head!

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