Which tubes best for Magnum Dynalab 106t tuner?


Which tubes are best for Magnum Dynalab 106t tuners? I have used Telefunken from Magnum Dynalab directly with mixed results depending on which quality tubes. Since Covid I found myself searching tubes from a different source and am now using Amperage tubes which are quite nice. Which tubes do people find the best for the Magnum Dynalab tuners?
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When I had my Magnum 102 T tuner, I used NOS Mullard tubes.  The sound was what I was looking for, but they went microphonic within 8 months. I purchased them from Uncle Kevvy at Upscale and they were rated as platinum( their best tubes).  At 8 months, Upscale wouldn’t do anything for me.  It was a very expensive lesson.  I am hearing the Mullard reissues are quite nice. 
The Telefunken tubes I have been using for years always gone bad within a year. How long should tubes last in the MD106t tuners?
Those low output type tubes 6DJ8/6922 should last for many years without replacement. You should take a look at some vintage GE or Sylvania tubes. You can’t beat those vintage tubes. I use them in my line stage and phono preamp and have never had any failure after about 10 years of use!