RE: VTTC -715B

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

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


Original poster: "David Sharpe by way of Terry Fritz <twftesla-at-uswest-dot-net>" < 
sccr4us-at-erols-dot-com> 

>Got lucky today at Richmond, VA Frostfest and picked 
>up five (5) NOS Raytheon 715B tetrodes for nearly 
>nothing, still in original boxes. 

>I know they were used as a hard switch radar modulator 
>tube, and are right robust looking for the tubes physical 
>size.  Any idea where I can get basing info and at 
>least plate voltage, current and fils specs?  They might make 
>an awesome Super Staccato breadboard coil, and if they 
>are related to 4PRXXX series, could really handle the kV 
>and pulse current.  Thanks... 

>Regards 
>Dave Sharpe, TCBOR 
>Chesterfield, VA. USA> 

Hi Dave, 

        From my old tube guides, I have been able to find out that the 
Raytheon 715B was replaced by the 715C a.k.a. RK-715C equivalent to Western 
Electric CW-715B and "very similar" to the (Russian) 5D21. From < 
www.webiosis.co.uk/valves/ RK-715.htm> I got the following: 
Raytheon RK-715B tetrode; (RK715C is listed as a pulse-modulator tetrode with 
a max 18Kv 15A anode and rated at 60W output; not sure if this is the same 
thing...) 
I think the 60W is continuous service rating, and pulsed could go much higher. 
Compare this picture with <www.macnet.or.ip/pa/upi-k/V1/5d21.jpg> 
I'll keep looking if you like. 

Matt D.