Being a user of the 845 directly-heated power-triode it is been frustrating that most if not all tube testers are not fitted with the "jumbo" tube socket.
That issue has now been eliminated with a jumbo-socket adapter that recently came on the market. Here is the link:
https://www.ebay.com/itm/355472580407
The information provided only has settings for two tube testers; however, any tube tester that has standard 4-pin sockets for the likes of 300Bs can be setup with a little fiddling.
I started with the 300B settings for pin-out then set about establishing settings for sensitivity, load, etc.
I used a known 845 as a benchmark and can now test my own 845s for viability and especially for matching pairs.
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