Deep Structure,
First please refer to the following post:
https://www.decware.com/cgi-bin/yabb22/YaBB.pl?num=1615347859/174#174 and then understand that the emails that come in my inbox I have kept up on all year with the majority of responses coming within 24 hours. I am not backed up on my emails, despite the large amount I get I have been able to answer all of them, no exceptions. That means one of two things, either I replied and the email came back non-deliverable, or your original email never made it, and was caught in a spam filter.
That said, Sarah is currently overwhelmed with emails and there aren't enough hours in a day to answer them all so she is backed up, and most of my emails come through her contact form on the web site so it's not unusual to be a week old before I even see it.
Now to your problem; There are two versions of that amplifier floating around, some biased at 40mA and some biased at 50mA. The vast majority are at 40mA. Since it is a cathode biased amp, depending on the actual tube, there can be as much as 5 or in some cases 10 mA difference in either direction. Since your amp seems to read high on both channels regardless of tubes installed, it makes sense that you have a 50mA model and that the meters are out of calibration. I can assure you that the amp isn't drawing 60mA, but even it were you couldn't hurt it until it got past 80mA.
You are welcome to have the meters calibrated and the amplifier brought into current production specifications under warranty if you're the original owner.
Steve