Modulus ROX-15 Master Volume DC Blocking Mod

So I can continue to use the Sovtek valves I've gone ahead and put in the Modulus provided DC blocking modification to the master volume pot.
As explained in the video, this actually isn't a really significant issue - and wouldn't have been an issue at all if I'd used the Modulus preferred JJ EL84's or according to my tests the Chinese Golden Dragon branded ones I have, but....