[Amps] Dx pedition amp ???

[Joe Subich, K4IK]

N8DE writes: 

> IF you can find one, the Dentron MLA-1200 fits your needs 
> quite nicely at 800 w CW output using a single 8875 tube 
> and a separate power supply with total weight of about 45 
> pounds [most of the weight is in the PS].

At 800 Watts CW output, you are seriously abusing that tube.
The 8875 is rated for 300 watts plate dissipation, 800 W CW 
even in class C would be almost 400 watts of dissipation. 
Considering that the 8875 is difficult to find, and very 
expensive if available, I would not push it nearly that hard. 

The MLA-1200 does not include any kind of grid trip circuit 
to protect against over drive ... a real problem with a grid 
rated for 5 watts!  Further, the amplifier lacks a tuned 
input which could represent additional problems for many 
current transceivers.  

Further, the MLA-1200 does not include 160 meters - a serious 
shortfall for a Dxpedition amplifier.   

73, 

   ... Joe, K4IK