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In the Forum: Melquiades Amplifier
In the Thread: Gas voltage reference 0A2 tubes.
Post Subject: Re: Help to identify 0A2 tube.Posted by Jack 14 on: 9/6/2005
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 them, rebranded by almost everyone around the planet, National-Richardson "Made in England" being the most common reprint: they came in a tube lot buyed from the Canadian Forces !!! Some Sylvania versions still properly shows "Made in USSR".
I also have 0C2s made the same way...
The "sharp needle" brigh nickel-plated pins indicates a Sveltana (St-Petersburg) manufacture.
The base pins look like the ones used on the Svetlana EF86 I have also.
They differ from the standard US or British by their smaller height and by using a violet-glowing (if I remember well) gas mixture. They also have a tendency of performing bad at low currents, giving a different voltage drop each time they are fired up.Rerurn to Romy the Cat's Site