Description

Tested Pair of Type 56 Sylvania NOS NIB Audio Receiver Preamplifier Vacuum Tubes Country of origin: USA Production era: 1940s Model: 56 Manufacturer: Sylvania (one rebrand for Philco) Type: Preamp / Driver Plate type: round black Base type: UY 5 pins Spacers: two with alignment tabs Getter frame: dimpled foil Getter flash: circular side Filaments: standard Glass: clear Stencils: very good Condition: excellent same construction Usage: NOS (new) Cartons: Included, in rough condition Quantity: 2 Please review the photos for more detail Test results: Excellent strong balanced results for Gm: 1.05 and 1.0 For Gm, the suggested minimum value is: .71 Shorts: None detected For testing, a calibrated Triplett 3444A tester was used Compatibility: Suitable for vintage tube-based equipment, ideal for use in guitar amplifiers, preamps and general audio equipment The tubes 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