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Hi Jack ,

Thank you for your very educational info ! It looks like you are right , and your tubes are rebranded SG13P ....  Maybe a big stock of those tubes were exported , and you know them better than we do :-)
And another question . You wrote :

"The 5651/0G3s were designed to provide a precision reference (they use a radioactive-doped gas, if I remember) for tube electronic regulators used in high-end instrumentation or communication equipment (the Collins R-390/URR use one in it's regulated PS, for example). The flip side being that they were optimized to run at low currents only."

What do you think about long-time reliability of this tube ? First of all I mean noise and fluctuations . I want to try them in a screen grid regulator for the first stage of a RIAA preamp , so the little and stable noise is important ! I have two 5651 , one tube operates very good , but another behaves a kind of strange - when I fired it up the first time it gave 100 Volts instead of 85-88 ( it's normal voltages ) and was quite noisy , but after 3 days of continious training voltage decreased to normal , and noise decreased too . I think that it can occure due to gas problems . Of course , the best idea is to replace this faulty tube ... but can I be sure that this kind of tubes will operate good later ?

Best regards
Dima

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