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Sylvania 5U4G Vintage Rectifier Tube 1950s Date Codes NOS in Green Box Tested / Guaranteed

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MPN:
5R4GYA
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  • Genuine NOS Sylvania 5U4G rectifier tubes in original green Sylvania Radio Tube boxes. Vertical 113 base date code (~1951). Tested strong full-wave rectifiers for vintage radios, hi-fi amps & guitar amplifiers. Rare collector quality from our nationwide inventory—authentic USA-made vacuum tubes for restoration.
  • Genuine NOS Sylvania 5U4G rectifier tubes in original green Sylvania Radio Tube boxes. Vertical 113 base date code (~1951). Tested strong full-wave rectifiers for vintage radios, hi-fi amps & guitar amplifiers. Rare collector quality from our nationwide inventory—authentic USA-made vacuum tubes for restoration.
$24.99
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Description

Sylvania 5U4G Vintage Rectifier Tube 1950s Date Codes NOS in Green Box Tested / Guaranteed

  This Tube and all others I sell, have been tested on a B&K Dyna-Quik Model 700 Dynamic Mutual Conductance Tube Tester and tests at or close to a NOS full Emission /Tube.

 

Authentic Vintage NOS Sylvania 5U4G Rectifier Tubes – Original Green Boxes! These classic full-wave rectifiers feature the iconic 'Sylvania Radio Tube' labeling and vertical 113 date code on the base (early 1950s production). Ideal for restoring antique radios, tube amplifiers, and audio equipment. Black plates, robust construction—tested strong and ready for your build. Limited stock from our nationwide collection of premium NOS tubes. Perfect sound and reliability for hi-fi or guitar amps. Ships fast with careful packing. Inquire for matched pairs or bulk!"
 
 
Key Identification Details
  • Box Markings: "Sylvania Radio Tube" on green boxes is a standard early-to-mid 20th-century Sylvania retail/consumer packaging style for receiving tubes. These are highly sought by collectors and restorers for authenticity in vintage radio/hi-fi restorations.
     
  • Base Marking "113" Vertically: This is a Sylvania date/warranty code (not an EIA manufacturer code). Sylvania used formats like three-digit codes (e.g., 113) in the late 1940s–early 1950s. It typically decodes as week 13 of 1951 (or very close surrounding years depending on exact format). Sylvania often used letter-number-letter codes (e.g., on the glass) or three/four-digit base codes for dating. The EIA code for Sylvania-manufactured tubes is usually 312 (sometimes etched or printed).
     
  • Date Code Range: Primarily late 1940s to mid-1950s for these styles (with 113 pointing to ~1951). Production of 5U4G continued later (into the 1960s+ with codes like four-digit or letter-based), but green-box "Sylvania Radio Tube" NOS examples are concentrated in the 1940s–1950s era. Black plates, ribbed plates, or specific getters are common in these vintages.
     
     
These are genuine NOS (New Old Stock) if untested/unused in original boxes—highly desirable for audio (e.g., guitar amps, hi-fi) due to robust construction and sound characteristics.
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