Vintage Readrite Signal Generator Model 554-A tube tester Estate find

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Vintage Readrite Signal Generator Model 554-A tube tester Estate find:
$10.50

This is for a vintage Readrite model 554-A tube tester. This reads on the top Signal Generator. This is in a wood box with a leather handle. The box measures 12\" x 6\" x 5\". I have no idea how to test this so that is how you but it. It came from a local estate and here to sell. offer with confidence. Thanks for looking.