[Amps] brass or BNP hardware

[DJ7WW]

I got both data sheets.
My saying is that specifications are far exceeded when 3x 3CX800A7 tubes are
run at 4KW out, not how far they can be pushed before the big bang happens.

The problem is the anode current and voltage limitation, not the dissipation
with 3CX800s and a large blower.
Dissipation is smallest when anode current hits its maximum.

The preliminary data sheet specs for absolutely maximum ratings in AB2 are
2500V 0.6A and the later specs are 2250V 0,6A.

Running 6KW out with 3 of them exceeds all specs even more.

And to repeat it, 4-400 specs can also be overrided easily with higher anode
voltages and more drive.

I did 1200W out with a single 4-125 in the past when our regulations limited
us to 150W maximum dissipation for the tube(s) in the final according to the
data sheet.
Eimac printed a special data sheet for their 3-150ZG showing 150W anode
dissipation ;-)).

6KW out with 3x 4-400/QB4-1100 are easy and tubes are dirt cheap compared to
3CX800A7.
The pair of QB4/1100 in my L4B can be pushed to 4KW out at 4.5KV from my
3-ph power supply.
 
73
Peter



-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Shane Youhouse
Sent: Dienstag, 23. November 2010 17:14
To: amps at contesting.com; DJ7WW
Subject: Re: [Amps] brass or BNP hardware

3 x 3cx800s will do a LOT of Pout.

Command's does near 6 Kw.


The 3CX800 has a pair of datasheets running around.  One shows Pout > 1200  
watts, another shows it at 750.

3 800s doing 4Kw is only 1300 watts a tube....  Easily accomplished, it's  
only 1.5 times Pdiss.


3 x 800s = 2400 watts of diss.  3 X 4-400s = 1200 watts of Pdiss.  I'm not  
a math major, but I fail to see how 1200 = 2400??????


--Shane
KD6VXI




On Tue, 23 Nov 2010 07:58:41 -0800, DJ7WW <dj7ww at t-online.de> wrote:

> Only if the tube specifications are far exceeded.
> 3x 4-400 will do the same then.
>
> 73
> Peter
>
> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of Carl
>
> I just serviced a LK-800C and discovered 6-32 steel hardware in the RF  
> path
> on both sides of the plate blocking cap. One side was darkened overall  
> and
> the other was black where the threads entered the cap, it looked like  
> rust
> under magnification. This amp will do an easy 3500-4000W + with  
> sufficient
> drive.
>
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