MB-1: Brand New Tubes, no sound on "Edge" or "Full" settings...

[BoWeevil2017]

Hey all,
I just switched out what I believe are stock 12AX7A tubes in my MB-1 for a pair of brand new Sovtek 12AX7 LPS.
Unfortunately, i am not getting any sound whatsoever out of the tube channel when I select either "Edge" or "Full".
The "Clean" setting, however, works as expected.
If I replace the old tubes, everything works just fine.
Thoughts?

[MarshallJMP]

The MB-1 uses one tube for the cleans and the second is only used when you select edge or full so one of the tubes is dead.