hello there,you say the valves are ok. please do not switch them unless they have the same number,check the pins on the bottom of the valves for a breakage, please try and check where they are pluged in for dirt if you have a meter check to see if power is going to the valves? loose wires, checkthe cicuit for a hair line crack,i hope this will help you with your amp
sandra
March 2011
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