Here is a link to the first VU-meter that I came across several years ago: http://m.bareille.free.fr/vu-in13/vumeter_in13.htm#vu4301 ,I built a few of the ones with the That2252 IC. It works very well and unlike other people here on the forum I never had any problems with either IN-9 and IN-13 back then, they all ran perfectly after the initial burn-in. I always do the burn-in process on one tube at a time and oversee the current/voltage over a few hours or days until the tube works as it should. With the batch of IN-9's and IN-13's that I bought back then, close to five years ago now, I did not have to run the burn-in procedure for more than 24 hours. It seems that I was very lucky with those that I bought compared to other people. /Martin
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