I recently came into possession of a Hickok 6000a. It seems to be limited on the types of tubes I can test.It came with the installed scroll. Is there a supplement I can get that would expand the number of tubes I can test?
Maybe it is just the chart but an example would be the 6S tubes . The only one on the chart is 6SN7. This is also true for the 12S tubes. The only one on the chart is 12SN7.
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