<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 =
> 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.
When you fix that. I'd look at the tubes.
What parts did you replace? What is the immediate history of the
amp?? That might help tell what the problem was/is.
<nofill>
73, Tom W8JI
w8ji@contesting.com
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