[AMPS] MLA-2500 questions

[Mark S Graalman]

   Brian,
  
Make a notation on what bands it occurs and if
its the same band(s) on both amps, AND can the
power output problem be corrected by retuning?

If the power output can be corrected by retuning,
is it mainly the plate tune or the load?

If its mainly the load, does the same thing happen
into a dummy load and a antenna?

Checking input SWR while making the above tests
may yield good information. Also check the
condition of the TR relay contacts.

I suspect drifty door knob caps, this amp is
FULL of them.

If the above doesn't apply, then there's a GOOD
chance the tubes are going soft.

Mark  WB8JKR




On Sun, 25 Oct 1998 11:16:51 -0500 "Brian Sarkisian" <kg8co@lni.net>
writes:
>
>I own 2 MLA-2500's that seem to be having the same problem ..... which 
>leads
>me to believe something
>else maybe causing the problem.
>
>Here is the problem.   It seems when I tune up both amps to full 
>output,
>they work great.  But after using
>them for a while ..... the power will drop way off .... then after a 
>few
>more moments the power will
>go back up to full output.
>
>I have had the same problem with both amps using different radios to 
>drive
>them and using different
>antennas ..... so at this time I am little confused.
>
>I have had one of the MLA amps for about 3 years, and thought it was 
>just on
>its last leg, but since I
>have picked up the other MLA and it is doing the same thing ..... that 
>got
>me thinking.
>
>Sure could use some help and ideas.
>
>
>73 de Brian, KG8CO
>Adrian, Michigan
>
>
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>

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