Re: Tube Tesla Coil

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Mddeming-at-aol-dot-com>

In a message dated 10/30/01 1:47:44 AM Eastern Standard Time, tesla-at-pupman-dot-com
writes:



>
> Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <evp-at-pacbell-dot-net>
>
> One thing to remember about "big"  RF power tubes; they take lots of
> filament power too!  Also, filament voltage is quite critical if you are
> pushing them +/- 5% is pretty typical.  Running too low will reduce
> output and too high will reduce tube life.  Moral - know your tube specs
> and adhere to them.  
>
> Ed
>
>



I'll second this. Knowing the specs is critical.
You might want to check out "RCA Transmitting Tube Manual" a.k.a. "RCA
technical manual TT-5". This lists most US tubes up to 4KW plate input. A
reprint is available from Antique Electric Supply of Tempe, AZ.

For the Absolute Mutha of all VTTC's an RCA 5770 Power Oscillator triode,
occasionally available on eBay (1 per Year), is not in the above book, but is
rated at about 26KW as a class C Oscillator. Specs are available on line. I
think the last one sold for about $600. It requires a dedicated fan and cold
water plumbing.

On a more realistic note, type 7213 has 1.5KW max plate dissipation, 2.5KW Max
plate input at 2500KV, as class C Oscillator, is forced-air cooled and so
requires no plumbing.

Matt D.