I'm just re-tubing this amp for a friend and was taking a voltage reading
on the output tube plates and noticed that it had ~525VDC on the plates
even in standby. I didn't think that was right, so I checked the preamp
plate voltages but they switch off and on with the standby.
Looking at the schematic: (http://www.schematicheaven.com/newam...vy_vtm_120.pdf)
-it appears that this is how the amp was designed to operate. V5-V8 plates
always socked with the full B++ while the V5-V8 screens and the pre-amp
plates are switchable with the standby.
Am I seeing that right? Do you think this is ok? I have seen a few debates
about whether or not standby is really needed, but it seems manufacturers
have just always had the standby linked to the plates no matter what.
Is this kind of a unique design or am I seeing this wrong?
on the output tube plates and noticed that it had ~525VDC on the plates
even in standby. I didn't think that was right, so I checked the preamp
plate voltages but they switch off and on with the standby.
Looking at the schematic: (http://www.schematicheaven.com/newam...vy_vtm_120.pdf)
-it appears that this is how the amp was designed to operate. V5-V8 plates
always socked with the full B++ while the V5-V8 screens and the pre-amp
plates are switchable with the standby.
Am I seeing that right? Do you think this is ok? I have seen a few debates
about whether or not standby is really needed, but it seems manufacturers
have just always had the standby linked to the plates no matter what.
Is this kind of a unique design or am I seeing this wrong?
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