Re: First VTTC light, and a few questions

["Grayson B Dietrich" <electrofire-at-juno-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Well...   ...I added a pair of 2kV .01µF ceramic caps in series to
ground, and the problem continues unabated. I'll try PP instead soon...

Grayson Dietrich
http://www.electrophile.8m-dot-com


On Fri, 21 Jul 2000 08:10:47 -0600 "Tesla list" <tesla-at-pupman-dot-com>
writes:
> Original poster: "David Trimmell" <davidt-at-pond-dot-net> 
> 
> Hi, This post by Ralph leads me to ask: you are grounding the 
> filaments?
> The reason a CT Filament Transformer is nice, but you can still 
> ground one
> side (I do, often). Any C (500 or so PicoF) to ground will take care 
> of
> nasty RF.
> 
> David Trimmell
> 
> At 07:37 PM 7/20/00 , you wrote:
> >Original poster: Parpp807-at-aol-dot-com 
> >
> >Grayson,
> >As the circuit starts to oscillate, as the plate current increases, 
> all sorts 
> >of dirty RF
> >flows into the filament circuit. I played with a pair of #10s and a 
> pair of 
> >45s. Both tubes are directly heated and exhibited the behavior you 
> describe. 
> >I have very little experience with
> >VTTCs. Bypassing the filaments to ground eliminated the problem. I 
> used a TV 
> >transformer with a fil CT but that should not make any difference. 
> I have 
> >some big
> >plate transformers that I hope to use with 4-811s or 4-836 triodes. 
> The 836 
> >has a large graphite plate and should make things nice and toasty. 
> Sorry I 
> >can't be of greater help
> >but my experience is :-((.
> >
> >Happy day,
> >Ralph Zekelman
> >
> >
> >
> 
> 
> 

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