EscrowUnlt © AP6.0This is a cute little GRAYMARK pocket sized tube tester! Probably was originally built from a kit and is in a nifty hard plastic case with clear lid too! Has AC power cord and is very simple to use to make basic tube tests on ytour octal and 7 or 9 pin miniature tubes. Nice quick tester for you audiofiles out there or anyone who needs a quick test for their tubes! Also has a set of test leads so you can do quick tests of fuses and check filaments on older 4, 5, 6 and 7 pin tubes too! I used it myself for awhile and it does work, also is a neat item for your collection!
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