Hello everyone I have the above mentioned tube tester and it will test every type of tube imaginable.the only proble is that it doesnt imagine 4 pin tubes such as type 26 or 45 or 80 etc. Can I modify this tester to test the older tubes or do I need to sit it on the shelf and forget about it and never dust it again or anything??? Would like to keep it thanks Lloyd oh by the way,this tester was part of the NRI electronics course back in 1975 my brother built the Heathkit 25'Console TV which was a nice tv set.

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