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4hv.org :: Forums :: Tesla Coils
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833C VTTC questions

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U4R1A
Sat Dec 15 2012, 11:43PM Print
U4R1A Registered Member #3505 Joined: Sun Dec 12 2010, 06:03AM
Location: Albuquerque NM
Posts: 108
I'm building a 833 VTTC and I was wondering what would be the best way to go about modulating it for some semi decent audio? I saw on pupman that I can do cathode modulation by using a low voltage transformer in series between the filament and ground. Do I need a special type of transformer or would a normal 110v->12v power transformer work? What kind of audio quality would I get out of a rig like this? I'm open to any suggestions.

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RateReducer
Sun Dec 16 2012, 03:34PM
RateReducer Registered Member #4603 Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
Hi! I modulated the G2 of a PL519. Nice results...



Audio source -> audio amplifier -> 12V-230V transformer -> cathode follower with ECC99 -> PL519 G2

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U4R1A
Sun Dec 16 2012, 05:12PM
U4R1A Registered Member #3505 Joined: Sun Dec 12 2010, 06:03AM
Location: Albuquerque NM
Posts: 108
Nice job!! The 833 is a triode so I dont have an G2. Would it be possible to put a tetrode(4-125 or 4-400) as a cathode follower to the 833. I could tie the screen to the plate and modulate the grid. Would something like this work?
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