We've had meters on our amps for the last 43 years. They were initially there to set up the power tubes (bias **and** DC Offset, since our amps have a direct-coupled vacuum tube output). This also allowed the user to test the individual tubes on the amp.
We went to using a VU meter about 15 years ago. We still use it to set up the tubes but its active all the time. We have our meters built to the original 1934 spec since we like having a vintage look.
We went to using a VU meter about 15 years ago. We still use it to set up the tubes but its active all the time. We have our meters built to the original 1934 spec since we like having a vintage look.