My only questions now are..
How do I properly add a volume pot to the new input?
And is a capacitor before the valve needed?
Also many thanks for your reply's!!! 
Hey Tom,
If you want volume control at input then Return to original input BUT insert a 100k ~250k pot in front of C52.
This will open up much better control over how the Amp responds to your rig.
If thee amplifiers overall system tone is bass heavy then you can reduce the value of C52. If on the other hand it lacks bottom end then remove C52.
Also R76 is 100k You can always make it 220k or higher,, that will give the input higher sensitivity.
Don't go crazy as it might squeal like a pig if the input is too sensitive. I'd try 220k.
Also worth note is you have all 3 plate resistors at 220k (being R3, R6 & R30) which to me is a bit too much. I'd be changing 2 back to 100k which might help civilize the outcome.
If you want to get more power stage magic OD then try changing R52 from 2k2 up to 10k or even 20k for some softer power stage compression.
A lot of the magic of the old famous valve circuits was in the power supply voltage drops,, far more useful than buying fancy pants brand name Valves

Phil.