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Re: Some photos of a CW VTTC

Hello, I tried to post an answer  to your audio question earlier, but the
moderator threw it out, I will try again.

I deal a lot with audio, use the 833's in transmitters for power, and
modulation as well. AM Broadcasting. Unfortunately, I have no schematics for
any of them anymore. I suggest you may try one of the following links:

You may also like to write the fine folks at
 I think they stock every tube left in the world, and also have some
diagrams available.
I think you will find some help here. I do intend in the not to distant
future to build an audio amplifier using an 833, I thought for one thing, it
would be a nice tie if  one were playing music through it, while burning the
TC. Please contact me if I can help further, I may be able to dig up in time
some specs and schematics on 833 audio sections of transmitters.
Thomas J.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, September 14, 2000 6:12 PM
Subject: Re: Some photos of a CW VTTC

> Original poster: FutureT-at-aol-dot-com
> In a message dated 9/14/00 11:19:12 AM Pacific Daylight Time,
> tesla-at-pupman-dot-com writes:
> >
> >  2 833C's; 0-3000V Filtered DC (fulwave rectifier with 16 uF filter
> >  Single strand MMC (seven series 0.01 uF Panasonic caps, 30 second runs
> >  with NO warming :-)); 12K resistance in grid leak bias; at 3000V pulls
> >  over 2 KW.
> David,
> Nice photos.  The sparks look the same as my filtered DC sparks
> (no surprise there).
> >
> >  For perspective, the coil is four inches in diameter.
> >
> >  I have a couple questions, when using a push pull configuration, how
> >  closely matched do the tubes have to be?
> Nothing too critical needed, because you can adjust the drive and bias as
> needed for each tube to balance them.
> >
> >  Second: I have been thinking about using a 304TL to amplify my audio
> >  signal to my audio mod VTTC. Anyone have any clues as to the bias one
> >  would use for this tube in single ended use? I have been trying to find
> >  any info on the use of this tube as a final in a single ended amp, but
> >  no avail...
> Hmmm.   I don't know much about using tubes for normal stuff like an
> amplifier, I would guess maybe a bias of - 100 volts, or -50 maybe?
> You'd want to center the bias around the linear operation area of the
> tube I guess.  It would help to look at the curves, or adjust the bias for
> best results by trial and error.
> JOhn Freau
> >
> >  Thanks,
> >
> >  David Trimmell