Nope it doesn't, and honestly I can't see how it ever worked properly without a shield it's just too noisy. I took a 7-pin extension cable and put the 6AL5 far away from the flyback, now it's pretty stable though the h-hold control has a hair trigger. Been watching the Matrix for a half hour now, it hasn't skipped a beat.
Linearity is really good too.
Guess I'll just have to remote mount the 6AL5, I'm satisfied that it will be stable enough come color wheel time. Speaking of which, I'm off to begin building the motor control chassis!