Re: [TenTec] Solid state amps

[Bill Fuqua <wlfuqu00@uky.edu>]

Sorry it is not a burst but a 5uS pulse at about 100 PPS.
By using long pulses like this I can use a simple diode rectifier and 
single capacitor filter in the Plate current detector ckt.
73
Bill wa4lav


At 11:40 AM 12/9/2003 -0500, you wrote:
> what sort of pulse width are you able to get?
> working on ionospheric sounder for the back yard :-)
> -bob
>
>
> Bill Fuqua wrote:
>
> >     Interesting item. By coincidence I am working on a power tube tester 
> > today. I built one some time ago to check 4CX250B tubes because we go 
> > thru a lot of them here.  I built a pulse tester that basically applied 
> > a large negative cut off voltage to the grid and then switched it to 
> > zero for a few microseconds and measured the pulsed plate current.  This 
> > worked just fine but if the tube arced over I had to replace the hard to 
> > find high voltage P channel MOSFETS. So, I have gone to a different grid 
> > pulsing technique that  uses a more common N channel MOSFET and is 
> > transformer coupled to the control grid. It seems to work great even 
> > with positive grid pulses over 2 amps. Now I can use it to check high mu 
> > triodes as well. I have lots of RF power tubes at home and this way I 
> > can test them with out having to have an amplifier. Even though the 
> > plate current may be several amps the DC Plate supply only needs to be 
> > good for a milliamp. or so.
> >     I simply compare the results with the data sheets to see if the tube 
> > is near spec.. This seems to work with in 10 or 15 percent using a new tube.
> >
> > 73
> > Bill wa4lav
> >
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>
>
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