John Lyles wrote:
> 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.
>
Hmmm..filament 20 volts at 1100 amps...I need a larger filament
transformer and a room to put it in. <:-))OTOH I guess I'll have to
pass as the I doubt the single phase 220 coming in would be up to it,
but man what a signal on 50 and 144 MHz.<:-)) But then I'd need to
replace the two coax runs and put up a tower strong enough to support
the coax. I just worked with the little stuff at 1/4 that power level
and down in the 100 KHz range. (In the "old days".
73
Roger (K8RI)
> 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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