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Phil Allison
 
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"timbo"


got a carvin X-Amp model XV-112.
this thing is a hybrid valve/op-amp type thing (3x12AX7, 4xEL34) 100w
output. whenever you turn the gain (either the clean channel or the lead
channel) up past about 5, the amp lets out a really high pitched squeal &
any signal level (like a guitar input) drops out to almost nothing, so all
you hear is the squeal. if the eq is set with the highs boosted, it's much
worse..

anyone got any ideas what might be wrong with it? tried changing valves,

but
that makes no difference..



** Have all the 12AX7s got their metal covers on ?



............ Phil