HRA-10-1 XTAL CALIBRATOR

[Phil Rand]

I tried this a couple of days ago, but it bounced for some reason. Here goes again. I just bought an old Health HW-12 and it had the xtal calibrator installed. No tube installed and no info in the HW-12 manual. Would someone be kind enough to tell me the type tube needed please?? My guess is a 6BZ6...in fact I tried one and it worked fb. But would like the correct info for posterity. Hi!!

Thanks in advance...Phil W7BW 

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