Amps
[Top] [All Lists]

[AMPS] AL811H saga continues

To: <amps@contesting.com>
Subject: [AMPS] AL811H saga continues
From: sales@radiosonline.com (Scott Bullock)
Date: Thu, 01 Jul 1999 05:30:45 -0400
Time to draw on the collective wisdom of the amplifier gods again....



I got the new Svetlana 811a tubes from RES in today and dropped them in tonite, 
but still can't get full power out of the amplifier. I can load the amp up with 
up to 200ma grid current, 450 ma plate current and 1500v high voltage, but the 
most I can get out of it is 500 watts cw. 


I originally thought that maybe because of the plate to grid short in the 
original tube that maybe there was something wrong still in the driving section 
on the tubes, ie a bad cap or something, so I pulled out 2 tubes and could 
still get the same amount of power out of the amp, so then I pulled 2 diagonal 
tubes out and did the same test and got the same results. 


So this rules out that there is still a problem with grid resistors/series 
blocking caps etc. Going from 2 to 4 tubes only changes the output by 5-10 
watts, and doesn't change the plate/load tuning much at all either.



Help! Anyone got any ideas besides send it back to Ameritron? This is a last 
resort option, as I really don't want to ship this.


Thanks in advance,


Scott


KA1CLX



<bold><bigger>

Advantage Communications

</bigger></bold>Professional Wireless Communications

www.radiosonline.com

800-851-RADIO

--
FAQ on WWW:               http://www.contesting.com/ampfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm


<Prev in Thread] Current Thread [Next in Thread>