| Country of Origin | United States |
|---|---|
| Type | NOS Tube |
| Model | 12AF3 |
Check the listing for details. 12AF3 TUBE NOS NIB 1 SINGLE. Condition: Open box, Made in United States. Listed at 1.00 USD. I have a B&K 747 tube tester. This is a mutual conductance tester. I also use a Tektronix curve tracer for testing triodes. I give a number of evaluations for tubes. The lines show how the tube conducts throughout that range.
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