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These are military spec germaniums from 1973, medium to low gain. We found that almost all of the NKT-275 sold, especially in the last ten years, are actually re-labeled transistors. We were able to see a CV7005 mark faintly on some of them (they rub off the old markings before re-labeling them), so we bought a bunch of CV7005 in the UK over a decade ago. We started selling these when we were running out of the red dot nkt275 in late 2015. These transistors have "KBDA 7301" on them. 7301 means 1973, 1st week. The K means that it has been manufactured to specification, the B indicates that approval was given by UK military authorities (military spec), D is the factory identification code for Mullard Ltd, and A is the Mullard Blackburn factory. We we know EXACTLY when and where these were made, and by whom. They sound like the NKT275 because they are probably the same thing. They sound more like the white dot NKT than the red dot, they are a little brighter clearer and cut better than the red dot. These have very limited availability.
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