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Thanks , that analysis describes the chain of events very well ...are those "virtual ct resistors" something that a tech would normally have in stock . Do those resistors usually take other components out with them when they go or can they fail and have no other effect on the circuits...

Thanks, sound advice ... regarding pcb board , will be taking it to a tech . Would still like to know the values of the resistors .

First let me say I have a very basic knowledge of what goes on under the hood of a tube amp (enough not to get zapped )and I can solder. Recently my 1991 mark 3 blue stripe started acting up , noises , pops , and a fairly constant hum , suspecting a bad tube I tapped on the tubes with a...