Thanks Martin. I do have a copy of the Mullard Transmitting Manual which
includes operating details of the QY5-3000. The problem is for SSB service
the info supplied is almost approaching class A....very inefficient. My own
experiments with the tube have moved towards class B using the figures in
the book for audio service. I now have info on the Phillips equivalent which
shows class B details for SSB. A specimen with low emission is used here as
additional ballast for the homebrew electronic keyer to stop it wandering
across the desk......it works well in that application!
Best wishes
Howard Aspinall G3RXH
----- Original Message -----
From: Martin John Hallsworth
> was given one of them once ..... made a damn good paper weight !!!
> Really big anode cooler.
> I did get some data but I doubt I still have it.
> (I passed the Valve on to some one whom wanted it)
> I do remember that the HT is about 5Kv max @ 1.3 amps
> and that 3 watts of drive @ 30 Mhz would give 1200W+ output
>
> I will look to see if I can find the data and let you know if I do.
>
> 73 Martin
>
>
>
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