Re: Mini VTTC--Possible tubes?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Steve White by way of Terry Fritz <twftesla-at-qwest-dot-net>" <slwhite-at-zeus.ia-dot-net>

I am planning on building a dual 833A VTTC eventually and I am also facing
the filament tranformer issue. The two 833As will need 20 amps at 10 volts
for filament power, not exactly a common transformer. My plan is to build my
own filament transformer. I will use one of my many MOTs that I have lying
around. I will remove the secondary windings and wind on 12 turns of
suitable wire for the secondary. Since the MOT core should handle at least 1
KW without saturating, this seems like a good plan.  12 turns would be easy
to wind.

Steve: Coiling in Iowa

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, March 06, 2002 6:57 PM
Subject: Re: Mini VTTC--Possible tubes?


> Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<evp-at-pacbell-dot-net>
>
> > > > Hi,
> > > > I have decided to start a VTTC.I was wondering,what sorta tube is
> > needed?I
> > > > want the smallest and cheapest possible tube to start with.Can
someone
> > give
> > > > me a list of possible tubes?Or what do i need to look for?
> > > >
> > > > Thanks so much,
> > > > Matt
>
> In addition to traditional RF power tubes, almost ANY audio power or TV
> sweep tube capable of 10 or 20 watts output will work just fine, so you
> have a wide selection of potential sources.  A lot of these now go for
> incredible prices because of the interest of audiophiles (audio
> snobs/nuts to me) who debate at great lengths over the relative merits
> of "triode" sounds compared to "pentode sounds", etc. etc.  You can even
> buy HI FI coupling capacitors and resistors to improve your tone
> quality.  (If you are a true believer!)  Look around the web and you'll
> find a lot of guys selling suitable tubes, some at quite reasonable
> prices.  Power triodes are easier to use than power tetrodes or
> pentodes, but somewhat pricier now because of the supposed superiority
> of "the triode sound".
>
> One source of greatly over priced tubes is Vacuum Tube Alley
> (www.vacuumtube-dot-com).  Go there to see what kind of tubes are generally
> available, then look at their exhorbitant prices and have a good laugh.
> Anything else will be cheaper.  A much better source is Antique
> Electronic Supply in Tempe, Arizona.  Their web site is
> www.tubesandmore-dot-com.  Very reliable outfit, prices reasonable even
> though you can do better.  Finally, swap meets are a great source of
> higher power tubes, but you have to be somewhat knowledgeable (sp?) in
> your shopping.
>
> Remember that the VTTC needs more than just the tube(s).  It also needs
> a high voltage power supply of some sort and, just as hard to find these
> days, a suitable filament transformer.
>
> I have some other tube URL's which I'll forward to anyone who wants to
> send me an email to:
>
> evp2-at-earthlink-dot-net
>
> Ed
>
>
>
>