Re: Unknown Valve

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

Original poster: "Stefan Richter by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Stefan.Mac.Richter-at-t-online.de>

Hi,
here is it what you need:
QY4-250
transmitter tetrode
Ua: 4000V
Ia: 312mA
-Ug1: 225V
Ug2: 500V
Ig2:  50mA
anode dissipation 780W
output power 980W
Class C mode: Ig1=8mA
PP mode: Ig1=3mA
fmax=186MHz

Sorry, no heater voltage and amperage noted!

Kind regards
Stefan Richter, Germany
stefan.mac.richter-at-t-online.de

Tesla list schrieb:

> Original poster: "Dr Brian H Le Page by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <B.H.Le-Page-at-surrey.ac.uk>
>
> Sorry, another what have I found question.
>
> The valve is a QY4-250 made by Mullard.  I have looked on a couple of web
> databases and had no luck.  Does anyone know the characteristics of this
> valve?  And the obvious question - Is it any good for a VTTC?
>
> B
>
> Dr Brian H Le Page
> Research Fellow
> Composites Research Group
> School of Mechanical and Materials Engineering
> University of Surrey
> Guildford
> Surrey
> GU2 7XH
> Tel. 01483 300800 x2439
> Fax. 01483 876291
> mailto:B.H.Le-Page-at-surrey.ac.uk