2 matched GE 12BY7A Tubes – Hickok 539B tests @ 10500, 11200, Min:5700
USD 43.50 USD
Specifications
| Country Of Origin | United States |
| Type | Vacuum Tube |
| Model | 12BY7A |
Type 12BY7A vacuum tubes. Thoroughly tested on Hickok 539B . Hickok 539B is a mutual conductance (Gm) type tube tester. 11200 µMhos. 10500 µMhos. One matched pair,circa 19??., U.S.A. made by GE.
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