The Diacrode is a decent high power UHF tube, it is a double-ended tetrode, but
it has the same transit time effects as a similar "bottom" circuited tetrode.
It merely allows placement in the center of a resonant circuit instead of
at the end, placing a more favorable portion of the voltage standing wave
across the active length of the anode/screen region. It does improve on most of
the other factors discussed that limit high power at high frequencies, such as
lead inductance and screen dissipation. I am working with one of these tubes at
present, a TH628. Try Googling this part number.
73
John
K5PRO
> > This discussion would not be complete without mention of
> > tubes which actually take advantage of the transit time
> > effect - TWT's (Traveling Wave Tubes) and Klystrons. There
> > may be others too. I haven't kept up with recent technology
> > in this area.
>
> Add to the list the Klystrode (r) or Inductive Output Tube
> (IOT) and the Diacrode. There may be other devices that
> combine multiple technologies - like the multi stage depressed
> collector IOT (MSDC IOT) - but it's been a few years since I
> last worked with the high power UHF devices.
> ... Joe, W4TV
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