Description

Tested Pair of 12BZ7 Sylvania Audio Receiver Preamplifier Vacuum Tubes Country of origin: USA Production era: 1950s Model: 12BZ7 Manufacturer: Sylvania Type: driver Plate type: curved black ribbed Base type: 9 pin Spacers: two Filaments: standard Getter frame: D type wire (horseshoe) Getter flash: top Glass: clear Stencils: one tube has no ID Condition: same construction Original cartons: excellent but a bit brittle Usage: minimal Quantity: 2 Please review the photos for more detail Test results: Excellent strong balanced test results for Gm: 2.3 / 2.4 and 2.9 / 2.8 For Gm, the suggested minimum value is: 2.1 Shorts: None detected For testing, a calibrated Triplett 3444A tester was used Compatibility: Suitable for vintage tube-based equipment ideal for use in tube amplifier power supplies and vintage audio / test equipment The tube will be carefully packed to ensure safe shipping Estimated delivery time within the USA is 3 to 7 business days Standard shipping service is US Postal 1st class Shipping is combined when applicable Please feel free to contact us if you require any additional information