Two, NEW, National Union 56, match date pair, #56
USD 39.95 USD
Specifications
| Brand | National Union |
| Type | NOS Tube |
| Country Of Manufacture | United States |
| Country Of Origin | United States |
Two, new in box, National Union 56 tubes, with the shouldered glass envelope. Black, round plates, firm bases, white printed logo bases, excellent silvering. Tubes are matched for dynamic gain and structure- test at 1950, 1900 where pass/fail is 920 micromho.
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