On Sep 26, 2006, at 11:25 AM, pentalab wrote:
Lemme get this straight
To calculate Grid diss..... we take RMS cathode V x DC grid
current ???
RMS cathode-grid potential multiplied by - meter indicated - DC grid current is an okay approximation. The actual dissipation calculation involves integral calculus.
If that's the case..... that equates to 1.2 KW of drive to
a 3CX-6000A7..... to just max out the grid [rated at 225 W
CCS].
Drive And degree of loading determine grid dissipation.
On ssb..... I don't think it's a problem anyway. We tried it
last night..... 1200 w of drive = 15 kw output... no sweat....
no fuss ..no muss.... and clean too.
Amazing.. how the gain keeps going down,as drive increases.
Not so amazing for those who realize that Mu goes down as anode-I increases.
With 100 w of drive = 3 kw out. 200 w of drive = 5 kw out.
800 w of drive = 11.5 kw out.
You just gotta love all these surplus vac caps, cheap copper
tubing from home depot, surplus 7-16 Din's, surplus vac relay's
etc. Those 253 lb Dahl's are a bargain.....
A Dahl 253-pounder is a serious waste of greenbacks for 15k out on SSB because one of his 68-pounders will do 15k out.
As I see it, a 253-pounder is more than enough for a 8910/4cx15,000J.
...
R L MEASURES, AG6K. 805-386-3734
r@...
