[AMPS] Problem with AL-811H

2 2@vc.net
Thu, 4 Oct 2001 08:11:37 -0700


>In a message dated 10/3/01 5:11:07 PM Eastern Daylight Time, w8ji@akorn.net 
>writes:
>
>
>> Subj: Re: [AMPS] Problem with AL-811H
>> Date: 10/3/01 5:11:07 PM Eastern Daylight Time
>> From:    w8ji@akorn.net (Tom Rauch)
>> Sender:    owner-amps@contesting.com
>> Reply-to:    W8JI@contesting.com
>> To:    carlseye@tampabay.rr.com (carl seyersdahl)
>> CC:    amps@contesting.com
>> 
>> >That isn't the problem being described Carl.
>> 
>> The tubes arced, and the diode that protects the meters is now 
>> shorted.
>=============================================================
>> carl / kz5ca  wrote: 
>
>> > The first place I would look is the coax,cable from the ant. relay to
>> > the output connector. I fought an amp , (not an al811) sometime back
>> > for quite some time before I decided to look in that area. It isn't
>> > the only place , maybe but it is one of many, and it's just not too
>> > obvious either!!!!! disconnect the rf choke on the output side and
>> > measure from the output connector to ground.have fun!!!!
>> >   carl / kz5ca 
>> 
>Carl,
>
>Thank you for accurately analyzing my problem.  A cracked solder connection 
>in the tank circuit (which was barely visible) turned out to be the 
>problem.  

//   I don't see how an out of resonance tank could cause the meter 
protection diodes to short and the tubes to arc.  What kind of diodes 
shorted?  My guess is that Murphy was right in that everything is more 
complicated than it first appears.  
- cheers

>You seem to grasp the situation with a minimum of information.  The tubes 
>are 
>all in good condition and the amplifier works well after redoing the joint.
>
>Thanks to all who offered suggestions which lead to the correct analysis of 
>the problem.
>
>Regards & 73 de
>
>Dave, WT8R
>
>


-  R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures.  
end


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