Mark III Simul Redplating on two adjacent power tubes sockets (6L6 and EL34)

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Red3

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Mark III Red Stripe, Simulclass is redplating on two adjacent power tube sockets (6L6 and EL34). I've tried swopping out tubes same result. The plate current on these tubes runs very high (80ma). The other side (6L6, EL34) the bias is steady and in spec. Any thoughts would be great, thanks.
 
JD probably hit it in one. If a coupling cap shorts (it'll be a .1 uF 600 volt orange drop) then the tubes on that side of the OT will lose bias and will red plate. It's recommend to replace both coupling caps as as pair.

Been there, done that.
 

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