Much has been written about RAM Labs testing of tubes, but I can't find much by way of explanation of the results you obtain for preamp tubes. On the box there are 5 parameters, VN, RAM, MIC, GAIN and PV
I think it would be useful to have some sort of guide to interpreting the results and how it affects the tube's performance.
Some are obvious of course, GAIN I assume is voltage gain and MIC is microphonics. But how does the GAIN measurement affect the channel balance of the preamp. Is there one tube in each channel or one section of each tube in each channel? Do you add the sections together to get the total voltage gain for the channel, then convert it to dB to get the balance?
For the other parameters, what units of measurement are used? For each parameter, are higher or lower numbers are more desireable?
I for one would appreciate having a greater understanding of the work that goes into rating these tubes and how to interpret the results. I know you had talked about discussing your tester in some detail in a previous post. This may be a good opportunity for that as well.