[AMPS] Unruly L-7 Amplifier

[measures]

>
>Hello All,
>Thanks to all who responded with different ideas concerning the L-7 fuse
>resistor problem.
>
>Looks like it was a bad tube.  He replaced the tubes and all is OK now.  One
>tube must have had an intermittent short, but all is well in Drake land now.
>
It is my opinion that 3-500Zs can be shorted in two ways.  Operation with 
the anode horizontal for a period of c. 12,000 hours.  Intermittent VHF 
parasitic oscillation.  Unless you improved the VHF stability of the L-7, 
you may not be out of the woods.  

later, Jeff

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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