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Read the Post in new Window Read the Post in Threaded view  Post #24: Leave them enough time ! by Jack 14 on 2007-07-18 
Browse the content of the threads in new Window  Thread: Gas voltage reference 0A2 tubes. in Melquiades Amplifier  42 Replies 
Hi Romy, Still playing with Gas zeners, isn't it ? I once seen, tested and scrapped "dead" ones.... Clue#1: they fire and (try to) regulate at higher than nominal voltages at normal current and are erratic.Clue#2: they have sections (at top an...

Read the Post in new Window Read the Post in Threaded view  Post #17: VR tubes stability by Jack 14 on 2005-09-09 
Browse the content of the threads in new Window  Thread: Gas voltage reference 0A2 tubes. in Melquiades Amplifier  42 Replies 
Hi Dima,Yep, I really think that I get this one right: I never take the time to do any research about it until your posting came. Luckily, I got the clues in less than 15 minutes. If only other things can be like that...About VR tubes stability, now:...

Read the Post in new Window Read the Post in Threaded view  Post #14: Re: Help to identify 0A2 tube. by Jack 14 on 2005-09-08 
Browse the content of the threads in new Window  Thread: Gas voltage reference 0A2 tubes. in Melquiades Amplifier  42 Replies 
Hi Dirma,Unless you can prove me something else: the ones I have (0C2s and 0B2s) are printed "Made in USSR" very clearly.I doubt that Canadian General Electric, or Sylvania, put this lettering on the tubes to conceal another ...

Read the Post in new Window Read the Post in Threaded view  Post #10: Re: 5651 vs 0C2 by Jack 14 on 2005-09-07 
Browse the content of the threads in new Window  Thread: Gas voltage reference 0A2 tubes. in Melquiades Amplifier  42 Replies 
Hi Romy,Well, I do not pretend to "know" those Rare-Gas zeners very well, neither to have "listened" (so to speak) to any. They are so low-performance devices when compared to the silicon technology that it is technically a pity, but, it doesn't prev...

Read the Post in new Window Read the Post in Threaded view  Post #8: Re: Sveltana's 0A2 tube. by Jack 14 on 2005-09-06 
Browse the content of the threads in new Window  Thread: Gas voltage reference 0A2 tubes. in Melquiades Amplifier  42 Replies 
You're welcome, Romy.I have still not found the original Russian "number" for those ones, but if ever I will, I'll forward you the info.For what purpose are you using them at 22mA ?...

Read the Post in new Window Read the Post in Threaded view  Post #6: Re: Help to identify 0A2 tube. by Jack 14 on 2005-09-06 
Browse the content of the threads in new Window  Thread: Gas voltage reference 0A2 tubes. in Melquiades Amplifier  42 Replies 
Hi, these ones are Russian military stock: see that no mica elements have been used in their construction, like the US Bendix Red Bank tubes (used in US ICBMs of the '50's-'60's). Old Soviet ICBM spare stock ?I happen to have a lot of ...
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