[Amps] brass or BNP hardware

[Carl]

----- Original Message ----- 
From: "Shane Youhouse" <kd6vxi at gmail.com>
To: <amps at contesting.com>; "DJ7WW" <dj7ww at t-online.de>
Sent: Tuesday, November 23, 2010 11:13 AM
Subject: Re: [Amps] brass or BNP hardware


>3 x 3cx800s will do a LOT of Pout.
>
> Command's does near 6 Kw.

I dont have the last of the PAC-8 dual voltage supplies, I can only get 5 
out with 150W of drive for the 6M conversions. The higher voltage one 
(around 3400V) came out long after Amp Supply folded. Cary did custom builds 
and eventually went with the 3CPX tubes and the big xfmr and new PS board. 
The 800C stood for Cary.


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


I have that original sheet. The FCC came down on Eimac and forced the 
change. The original dual voltage PAC-8 was used after Eimac gave approval 
to use on SSB at 2900V.


>
> 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??????

At 1500 out a 4-400 key down is almost yellow, I tried one at 5KV once which 
was enough.I cant imagine any surviving long that way.

I also watched a pair of 4X1's at 10KV, that was another scary sight from a 
rather well known Northeast DXer and contester.

Then there was the 4 x 8877's into a 3el 75M rotary from another guy.

Carl


>
>
> --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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