>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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