Some years ago I had a Marshall TSL601 - 60w combo tube amp. One of its features was "Silent Recording", here's the explanation from the user manual... "Master Volume: User Hint - As the (rear panel mounted) speaker emulated D.I. output is derived from this circuit you can balance the sound coming out of the loudspeaker from zero to full, whilst maintaining a constant level out of the D.I. output - ideal for silent recording, direct to the desk." Are there any other modern combo tube amps that can do this?