FS:B&K Model 500 Dyna-Quick Mutual Transconductance tube tester with 510 expansion module. This tube tester does not work correctly. It turn on and lights up, but the meter read backward. The cabinet has some worn and tear spots in the cover cloth. I cleaned it up and put some conditioner on the cabinet cover. It looks pretty good. .Pictures are available. The panel is in great shape and shows hardly any wear. This is probably the easiest tube tester in the world to use. There are only two control settings, the filament voltage and sensitivity. . Included is a tube data chart and a copy of the manual. There are several You-Tube videos one an easy calibration of this model tube tester, but I think it needs more than calibration. Price is $50 plus shipping. Thanks, Charlie Hugg, K5MBX
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