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Re: [TCML] 715B VTTC
Vladi
Tube is a 1950-60's vintage radar pulse modulator tube capable of 17A
at 17kV maximum input.
Can also be used as a gated high power oscillator (very short duty
cycle <<5%). Non-standard
filament voltage (26V, 2A)
http://www.radiomuseum.org/tubes/tube_715a.html
http://zugzwanged.org/dat/bin/electronics/120_White_RSI_63_3156_1992_Hi_Pwr_Microwave_Pulse_Gen.pdf
The above reference actually shows tube in its intended use
with circuit parameters.
Tube characteristic curves are at:
http://scottbecker.net/tube/sheets/061/p/P535-1E.pdf
PRECAUTIONS:
1. Tube filaments are oxide coated (to achieve high cathode current capacity)
and require a minimum of 1 minute warm up prior to use, longer heating
time is necessary to achieve "gettering" effect on vacuum if operating tube
close to its maximum ratings (15kV, 3 minutes per above "P353-1E"
reference).
If HV is applied sooner, cathode coating can be stripped off
filaments, leading
to anode current reduction and eventual failure.
2. X-Rays: At voltages tube is capable of operating, soft X-rays can
and probably
will be generated. Tube, socket, and oscillator support hardware should be
installed in metal enclosure with feed-through insulators sized
for applied voltage.
3. HV KILLS. The pulse power capability of this tube is sufficient
to be hazardous!
4. Cooling- recommend force air cooling to prolong tube life. Note
well the tubes
continuous CW anode dissipation is only 60W.
I have 5 NOS versions of this tube with 4 ceramic latch down sockets, hope to
eventually build a pulse modulator type VTTC using two of these tubes in
push-pull.
Regards
On Thu, Sep 23, 2010 at 9:18 AM, Vladimiro Mazzilli <V.Mazzilli@xxxxxxx> wrote:
> Hi all
> I have found this old topic looking for James 3xc3000 big tubecoil. I have several pieces of 715A 715B 715C and Russian equivalent GMI83 and GMI83V and I'm working on a single tube VTTC, for the moment the coil reaches 12" spark with a little mot not doubled at 75% rated input voltage.
> Plate seems to keep grey colour.
>
> Vladi
>
>
>
> Vladimiro Mazzilli
> Ricerca & Sviluppo
> Aros
> Via Somalia 20
> 20032 Cormano (MI)
> Tel. +39 02 66327266 - Fax. +39 02 66327528
> Skype Id: - VoIp:
> E-mail: V.Mazzilli@xxxxxxx
> Web: http://www.aros.it
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> -----Messaggio originale-----
>
> Da: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] Per conto di sparktron01@xxxxxxxxxxx
> Inviato: martedì 17 febbraio 2009 0.36
> A: Tesla List
> Oggetto: [TCML] 715B VTTC
>
> All
>
> Someone posted a while back about building a VTTC using 715B
> Radar modulator tubes. Please contact me off list to discuss further.
>
> Thanks
>
> Regards
> Dave Sharpe, TCBOR/HEAS
> Chesterfield, VA, USA
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--
Dave Sharpe, TCBOR/HEAS
Chesterfield, VA USA
Sharpe's Axiom of Murphy's Law
"Physics trumps opinion!"
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