Originally Posted by PaoloJM

It's always good practice to at least check it.
I pulled two tubes on my JCM800 and was disappointed with the results.
The volume drop isn't great and you loose some low end drive. I guess the power isn't there anymore to push the low frequencies. The one good side is the earlier break-up.
The next chance I get though I'll be putting them back (and re-biasing).
Your best bet for keeping power tube drive at lower volume is a good attenuator.

Regards,
Paul.