Tube Rolling Time

For the decware Zen, try a Mullard gz32 rectifier and if you haven't already, buy a couple of sv83 output tubes from Steve at Decware, also the input tube is a 6922,7308,6n1p etc, what are you using now? 

allane,
I don't have your amps to give you specific firsthand recommendations on tubes for them; however, below is a link to Brent Jessee's website where you can look up the tube types in your amps , for instance 12ax7 , click on it to get to the page where he offers insights into the sound of various brands as well as, providing insights on the tube's equivalent for example for a 12ax7 - 5751 tube. This might give you some tube rolling ideas for your current amps and any future ones you might purchase

http://www.audiotubes.com/

@racamuti @facten 

Thanks to both of you for the recommendations and information.  I will follow your recommendations and report back.  Have a great evening and take care of yourselves.  Be safe and well.

+1 for recommendations from Brent Jessee. He gave me a few 6922 suggestions for my VAC linestage - ultimately I chose a pair of NOS Mullard 7308's which made a material sonic improvement for my system.

The key to tube rolling is to use well balanced tubes with nice flat sides, tubes like KT88. Those roll really good. Rounded tubes like 300B wobble and roll all over the place. D105, don’t even ask. 12ax7 seems like they would be okay but the wide base makes it so they always roll in a circle. Round and round they go, never really getting anywhere. That’s tube rolling for ya.