Re: VTTC Tubes

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

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

Yes you can make your own tubes. I have made them with porcelin spacers
clamped together. A vacuun pump will pull nearly enough vacuum if you use a
little Magnesium granuals heat vaporized to kill the last little bit of air
the pump dosent remove. Your frequency is low so you dont nead to wory about
shape to much. Its a lot of trouble, but fun to do. An 833 tube is a lot
less trouble and cheeper.
  Robert  H

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Fri, 29 Mar 2002 15:45:42 -0700
> To: tesla-at-pupman-dot-com
> Subject: Re: VTTC Tubes
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Fri, 29 Mar 2002 15:57:44 -0700
> 
> Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <jimlux-at-earthlink-dot-net>
> 
> you must be a masochist... In short, yes, you could build your own tubes
> (after all, Lee DeForest did it...), however, I suspect that the performance
> would be poor, and given that you probably don't have (inexpensive) access
> to all the nifty stuff that makes for efficient tubes (thoriated cathodes
> with just the right trace elements.., pyrolytic carbon for the anodes,
> really fine wire for the grids...)
> 
> However, if you are bold... you might want to contemplate building HV
> rectifiers (as in, 200 kV...).  Lots of those early HV DC power supplies
> basically ran in a vacuum tank (for insulation) and had the rectifiers (as
> in a voltage multiplier configuration) just "hanging out in the wind")..
> 
> There used to be a company that actually sold a kit for making your own
> triodes, etc....
> 
> 
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Friday, March 29, 2002 9:53 AM
> Subject: VTTC Tubes
> 
> 
>> Original poster: "Marry Krutsch by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <u236-at-earthlink-dot-net>
>> 
>> Hi All!
>> 
>> A stupid question, but I'll ask anyway.
>> 
>> Has anyone here tried to make their own high power triodes?  Since real
>> transmitting triodes (833a's, etc) are very expensive, might making
>> tubes be a viable option for some?
>> 
>> I was thinking of building a VTTC at some point, and if I'm going to
>> build the coil from scratch, why don't I build the tube(s) as well?  The
>> main problem would be pulling a good vacuum inside the tube without a
>> vaccum pump, but I have some ideas (Uh-Oh :-)).
>> 
>> Just Wondering,
>> Winston
>> 
>> 
>> 
> 
> 
>