hirsch: Thanks, this is very useful information. I bought the B&K from Brent Jesse less than a year ago. It was calibrated at that time. I sent the tester back in August because I was getting some low readings on NOS 6sn7 tubes and the meter was bouncing around a but. Brent looked over it and changed the regulator lamp which was causing the meter to bounce. It was also the case that the manual had the wrong settings for the 6sn7 in it (has something in the 60's for sensitivity I think where Brent said it should be 80). Now it is working well with the 6sn7's. I wonder if the manual has the wrong settings for the 6AS7 or 5998. I'll do some more tests tonight. It is useful to know about the life test; I hadn't been paying much attention to it. I wonder how many good tubes I have thrown out in the past because they tested "bad/low" on the B&K.
Nate: I may take you up on your kind offer if I cannot get things sorted out locally. Many thanks again.
They test in the bad region which really surprises me. I haven't tried a pair of 6AS7 in the tester recently. So maybe I should try that (if I have a pair... pretty sure I at least have some 6080's). I also have another pair of 5998's that I could try.
The whole file would be great. I will send you my email by PM.
Thanks Nate. The 6AS7 data is the same as in my manual. I will try those settings for the 5998. The only difference seems to be the sensitivity setting. Since it should be set lower on the 5998, doesn't this means that the tubes should actually test lower than they would on the 6AS7 settings or am I oversimplifying or inverting things? In any case, I will try it out.
Raffy is looking for a pair of TS 5998's for his SP and I have a pair that are supposed to be NOS. I would be happy to help him out but I don't know how to test these on my tube tester. I have a B&K 747B. I tried testing them with the 6as7 settings but they both test low this way. Since they are not equivalent to the 6as7's, I am not so surprised (I think this has happened with every pair of 5998's I have tested this way). So can anyone help me/us out? Pretty please.
I have a separate computer for each of my tasks: email, LaTex, web browsing, Adobe Illustrator, itunes... I thought one should always get separate components.
It's about time!
I brought my Stello stack (DA100 + HP100) to the office today. I like. I think I will keep it here since I haven't been listening to them much at home.
If you happen to be in the mood for good ribs/BBQ while you are there, this place is damn tasty (it is in Somerville near the T - red line).
Redbones barbeque
Had a good time hanging out with JP, Al and Ric. It's too bad that you NorCal'ers will be losing JP, he is a cool guy (Al and Ric aren't too bad either ).