Power Entry module (Twin fused?)

[Champ81]

The kit i got is cathode biased. So i am really planning on making it fixed. So basically i would need to make the cathode resistor a variable resistor.  With test points tied to the cathode (pin 3) of the el84s?  Im still relatively a novice in this whole thing so the questions will be very basic.  While learning. In TUT 2 it explains it clearly but it looks like its for a fixed biased amp converting to exclusive pots for each tube. I can only for now learn through paint by numbers type of explanation. Sorry.





























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