I don't think there is anything that could be called a close substitute.
You don't give many details of what you are looking for. Are you looking to sub in a Russian substitute for an existing design that has a 12BH7A? If so, I am guessing that it is a split load phase inverter and many tubes such as 6N1P, 6N6P, 6H8C, with a gm of at least 3100 would work OK. If you want a better answer, you should either identify the design, or at least the phase inverter type, and whether both noval and octal tubes are OK.
You don't give many details of what you are looking for. Are you looking to sub in a Russian substitute for an existing design that has a 12BH7A? If so, I am guessing that it is a split load phase inverter and many tubes such as 6N1P, 6N6P, 6H8C, with a gm of at least 3100 would work OK. If you want a better answer, you should either identify the design, or at least the phase inverter type, and whether both noval and octal tubes are OK.
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