Thanks John,
Have a nice week break.
Unfortunately, for guys that are using the Russian triodes, getting an
proper set of curves like what Eimac users enjoy is but only a dream...
I will dig out the C&F again and look it over. Had not focused much on
the cathode consideration prior to your suggestions. Which I really
appreciate.
73/jeff/ac0c
John Lyles wrote:
>
>> For the cathode emission limts, do you think there is a way to
>> characterize this? Or perhaps infer it from pulse-mode data assuming
>> comprable CCW data is not available?
>> 73/jeff/ac0c
>>
>
> Yes, it is available already measured, on the datasheet. Look at the constant
> current curves on an Eimac sheet, for instance. The top curve is pretty much
> the peak that they tested in some fashion, and it is usually a LOT higher
> than your DC readings. If you are familiar with Tube calculator #5 by Eimac,
> you know how you have a particular load line that swings back and forth,
> usually diagonally intersecting the constant currernt curves. These may be
> cathode or plate current lines, but they are usually close. The peaks of the
> RF fundamental sinewave will be swinging up into the high current regions on
> that part of the cycle and down to near cutoff on the other part. Or into
> cutoff. This all depends on the class of operation, AB, B and C for
> instance. Take a look at Care and Feeding on the curves and using them to
> predict operating points.
> I am going off line for a week for R&R.
> 73
> John
> K5PRO
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|