Elmer Sharpe wrote:

I bought a neat old Chinese military receiver on ebay some time ago.
Unfortunatly it has a bad 1B2 chinese tube. I don't believe there is a
knowen American conversion tube for this. If there is please tell me?
if not does anyone know where I can buy a chinese 1B2 vacume tube
please? regards, Elmer (Idaho)

I think that is a current production Shuguang tube but I do not have a
Shuguang databook here.

I do have a Toshiba 1970 tube handbook which lists a Japanese 1B2 type
as a diode-pentode. Ri=500K, mu=13.5, B7G basing and 1.4V filament.

Check your circuit and see if the basing looks like that of a 1S5 tube.
If so, give the 1S5 a try, I think it should work.

Otherwise you can try tube dealers, but the 1B2 is the kind of thing
that folks try NOT to get from Shugang because there's little demand.
--scott





--
Elmer Sharpe


--
"C'est un Nagra. C'est suisse, et tres, tres precis."