How to use RCP 802A tube tester test B9A tubes?

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Kenneth Zhu

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Joined 2003
Recently I bought a second-hand USA-made RCP 802A tube tester (please check the photo). According to user manual, it can test common B9A tubes like 12AX7, 12AT7, 12AU7, etc. But I find that there's no B9A socket on the front board. Has any tube lover tried this type of tube tester? Please give me some hints. Thanks a lot.
 

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