[AMPS] Re: SB220 problem

[measures]

>When my Kenwood TL922 quit, I pulled out my trusty(?) SB220, which has been 
>sitting under my radio bench for a number of years, put it in place, & tried 
>to tune it up.  However, I couldn't get any output from it although the 
>antenna relay clicked.  High voltage in the CW/tune position is 2700V.  When 
>I turned the switch to grid current the needle pins all the way.
>Anyone with suggestions?

Install glitch diodes to protect meters.
Remove +110vdc from relay's bias contacts to prevent shorted tube from 
destroying fil. transformer. . 
Install glitch R in hv positive lead. 
If your 0.82 ohm grid current shunt is open, chances are you have a gassy 
tube, or you had an internittent parasitic oscillation.    To find out 
which, it takes a high.-pot. tester.   

good luck, Joe

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


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