Re: Vacuum Tube coils..

To: tesla-at-pupman-dot-com
Subject: Re: Vacuum Tube coils..
From: Grayson B Dietrich <electrofire-at-juno-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Wed, 17 Nov 1999 17:55:14 -0700
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hello Michael,

I'm in a similar position, brewing up my first VTTC, though I already
purchased a single 811A for the purpose. A word of warning, that 5V
supply should ONLY be used for tubes with 5V filaments. This goes
especially for thoriated filaments rated higher than that. It will leave
you with a low or non-emission filament, essentially a dead tube.

Here are a large amount of smaller triodes I have specs on, roughly
arranged in increasing plate current capability. Mind you, while triodes
are what are most aften used in VTTC service, there are many tetrodes and
pentodes (803s come to mind) that would also be suitable. If you find a
great price on an unfamiliar tube, just make sure it has a really big
plate, preferrably graphite.(?)

809
1623
HK54-5V filament
3-50A4-5V filament
35T-5V filament
3-50D4-5V filament
35TG-5V filament
T55
826
830B
930B
811A
812A
5514
3-75A3-5V filament
75TH-5V filament
3-75A2-5V filament
75TL-5V filament
8005
V-70-D
3-100A4-5V filament
100TH-5V filament
3-100A2-5V filament
100TL-5V filament
211
311
254-5V filament
805
3-150A3-5V filament
152TH
3-150A2-5V filament
152TL
572
810
8000
4C34
HF300
T-300
T-200
806-5V filament
3-250A4-5V filament
250TH-5V filament
3-250A2-5V filament
250TL-5V filament

That covers a range of 30 watts dissipation (809, 1623) to 250 watts
dissipation (3-250A4, 250TH, 3-250A2, 250TL)

Any of them should work.
Hope this helps ;)

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

On Tue, 16 Nov 1999 21:37:56 -0700 Tesla List <tesla-at-pupman-dot-com> writes:
> Original Poster: "Coiler" <mycroft-at-access1-dot-net> 
> 
> 
> I admit ignorance here, but I'm thinking of making an attempt at a 
> VTTC -
> I've
> finally got a collection of decent MOT transformers, and I have a 5V 
> 100A
> supply
> lying around - should run those filiments just fine :).
> Anyway, If someone could send me a list of usable tubes for a VTTC 
> I'd
> appreciate
> it - That way I can start hunting the flea markets, etc.
> [Do list any caveat and/or all tubes you can think of that would 
> work]
> Thanks!
> 
> Michael Baumann
> Coiler, Homebrewer, Nerd...mycroft-at-access1-dot-net
> http://www.access1-dot-net/mycroft
> 
> 

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