Still old tubes, lots of miles! Did you check your
wattmeter to make sure its not drifting around?
Are you using ALC back to the rig?
Did you try a different rig?
I would think if a tuned input would fix it
the problem would have always been there.
Mark
On Sun, 25 Oct 1998 15:39:59 -0500 "Brian Sarkisian" <kg8co@lni.net>
writes:
>Hello Mark ...
>
>Thanks for the e-mail note concerning the MLA-2500.
>
>You had made the comment abt retuning.
>
>In this case retuning didn't make any difference.
>
>And abt the tubes being soft ........ guess they could be .... but
>what are
>the chances of 2 amps
>
>having the same problem ?
>
>Do you think if I got a tuned input to put between the rig and the
>amps
>would help anything ?
>
>
>73 de Brian, KG8CO
>-----Original Message-----
>From: wb8jkr@juno.com <wb8jkr@juno.com>
>To: wb8jkr@juno.com <wb8jkr@juno.com>
>Cc: kg8co@lni.net <kg8co@lni.net>; AMPS@contesting.com
><AMPS@contesting.com>
To: <amps@contesting.com>
>Date: Sunday, October 25, 1998 3:11 PM
>Subject: Re: [AMPS] MLA-2500 questions
>
>
>>
>> You might also want to check your wattmeter!!
>>
>>Mark WB8JKR
>>
>>
>>>
>>> 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
>>>>
>>>>
>>>>--
>>>>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
>>>>
>>>>
>___________________________________________________________________
>>>You don't need to buy Internet access to use free Internet e-mail.
>Get
>>>completely free e-mail from Juno at http://www.juno.com/getjuno.html
>>>or call Juno at (800) 654-JUNO [654-5866] -- 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
>>
>>___________________________________________________________________
>>You don't need to buy Internet access to use free Internet e-mail.
>>Get completely free e-mail from Juno at
>http://www.juno.com/getjuno.html
>>or call Juno at (800) 654-JUNO [654-5866]
>>
>>--
>>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
>>
>>
>
>
___________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com/getjuno.html
or call Juno at (800) 654-JUNO [654-5866]
--
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
|