[AMPS] Grid Current Indication-SB220

[measures]

>
><italic><color><param>0000,0000,0000</param>> I have just acquired an 
>SB220 that had a parasitic oscillation. I have =
>
>
></italic>...and you know that it was a "parasitic"  because???<italic>
>
>
>> repaired the burnt components and nothing is smoking now. I get a =
>
>> negative reading when switching to the "grid" setting on the meter. =
>
>> (Enough to pin the meter to the negative side). This occurs with no =
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>> tubes installed, so problems in the grid circuit seem unlikely.=20 Any
>
>> hints as to what to look for?=20</italic></color>
>
>
>I'd look for an open grid shunt.
>
good advice
>
>When you fix that. I'd look at the tubes.
>
Looking at the tubes requires a high-pot. tester to measure the grid/fil. 
breakdown voltage.  .  
>
end

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


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