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Nice score! I would,however,make the change to a bias adjust system instead of the bias balance system it may have in the amp.You will be able to bias tubes properly and not worry too much about over-current.
You can also do both a bias adjust and bias balance system so you can use mismatched tubes.Or simply do a 'dual-bias system'.Either way,the bias balance silverface thing is just plain stupid.
If you swap the rectifier tube to a GZ34 you HAVE to make the change.The increased voltage will make the tubes draw too much current and possibly redplate.

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