For a year or more this amp was not a product offered in the Z lineup. The amp was only in the hands of Brad Paisley. The amp is now available to all.
As a side note, there is info on the amp at http://www.drzamps.com/amp/z_wreck/
One of the other folks chimed in with:
Thanks for the great advice and info Myles!
Anyway you would want to post "what I look for on Brad's tubes " here? or is that super duper private info?
That brought on my reply that I was the basis for this particular post:
Not private at all.
First, I ask my vendor to only send me tubes in a plate current range of 39-44 milliamps from their test machine. My test equipment is calibrated to the same standard as theirs, RCA book standard spec for an EL84.
A few EL84 data sheet links to go along with some I have posted on my GAB website: