Sylvania 5U4GB Rectifier Tube 1950s USA - Tested

Superior Sound Supply selling some seriously special stock - This NOS Sylvania 5U4-GB rectifier tube represents classic American manufacturing from the mid-1950s. These black Plates, halo getter tubes are renowned for their reliability and robust sound.

• Type/Model: 5U4-GB

• Manufacturer: Sylvania

• Manufacturing Date: c. 1950s

• Condition: NOS (New Old Stock)

• Getter Type: Halo Top Getter

• Plates Type: Black Plates

• Test Results: Professionally tested on our calibrated Precision Model 612.

• Shorts/Opens/Leaks: None detected.

• Emission (Plates 1): 96%

• Emission (Plates 2): 100%

Condition Details

This tube is in great NOS condition. The glass is clean and the internal structure is perfect. The original Sylvania box is included, which is in good condition but shows some expected shelf wear from its age.

Historical/Technical Context

The Sylvania 5U4-GB is a staple full-wave rectifier, famous for its use in classic Fender tweed amplifiers and countless hi-fi systems. Black Plates versions like this one from the 50s are particularly sought after for their durability and classic sag characteristics, making them a perfect upgrade for vintage tone.

Superior Sound Supply Guarantee

Superior Sound Supply Quality Assurance:

Transparency and accuracy are the cornerstones of our business. We ensure every component is vetted so you can buy with complete confidence. Along with Superior Supplies for all of your sounds, We stand on Superior Service, If your not satisfied with our supply we will make it right.

Shipping: Carefully packaged with consistent methods that are proven to protect your item and ensure safe delivery. We primarily use USPS, and FedEx for large or high-value items, and can arrange international shipping to anywhere in the world. Orders are processed and shipped within 1-3 business days of payment clearance. We do not ship on weekends or federal holidays. Orders placed after 2:00 PM CST Friday will ship the following Monday.

Returns: New Items

Returnable within 30 days of delivery.

Used & Vintage Items

Returnable within 30 days of delivery.

General Terms

Items must be returned in original, as-shipped condition with all original packaging and no signs of use. Buyer assumes responsibility for all return shipping costs unless the item was not received as described.

Make sure to check the return policy on each individual listing as some items may be sold "As-Described" and not eligible for a return. We want you to be completely satisfied with your purchase.