Rolling Mullard 6DJ8 into GE 5670 Application

@lewm - Thanks for the information.  I don't know if it matters, but the adapter is allowing me to use an E88CC tube in a 6SN7 application which is the opposite scenario.

For what it's worth, it's been running since yesterday morning and so far nothing bad has happened...

If anyone is interested in the results so far, there certainly seems to be some added clarity, instrument separation, and air around the highs, but the bass also seems to have taken a backseat with some harshness in the upper bass and upper mid ranges.  I don't find it very satisfying when a change yields very mixed results.  I'll let them ride for a while longer and then switch back and see how things sound.  I think I've lost from PRAT with the change in bass presentation.

Best of all, nothing has burned down yet...

The E88CC is capable of adding airiness, and separation between performers.

They are also adept at allowing the note and vocal to have a perceivable envelope.

They don't overwhelm in the Bass area, the Bass is present, but will be well defined and have an attractive decay.

Any valves I have used during Tube Rolling, that have been hard on the ears in comparison to other used Valves are removed immediately, I can't see how they are to deliver the standard on offer from others being trialed. 

After putting the 396A tube back in and having mixed emotions about the results, I talked myself into taking a different approach all together and scratching another audiophile itch.

I've purchased a used Denafrips Ares II DAC that I hope will be a clear upgrade for my system.  I did some reading to reinforce my expectation bias, so I've done what I can!

The Maverick Audio TubeMagic D2 DAC is clearly an entry level product (<$250) and marketed as a desktop DAC.  With the Sparkos Labs op amps I believe that it outperforms it price point, but anticipate that the Denafrips will be a step up.

The results are in and the Denafrips Ares II DAC is a clear upgrade for me.

It makes sense as I auditioned the Maverick Audio TubeMagic D2 DAC against the Schiit Modi Multibit and determined that the Modi sounded the same as the tube output on the D2 and I preferred the solid state output.  I then upgraded the D2 with Sparkos Labs op amps which was a clear upgrade with the result being that I then preferred the tube output.  The Denafrips Ares II is a clear upgrade to the modified D2 and is commonly compared to the Schiit BiFrost (or Gungnir), so seems to align with what would be expected.