Sylvania (Baldwin) 5U4GB Rectifier 1963 USA - Tested

Superior Sound Supply selling some seriously special stock. Sylvania-manufactured, Baldwin-branded 5U4GB rectifier tube. sourced from a vintage organ. Known for their rugged construction and "chrome top" design, these black plate rectifiers have been professionally tested and are ready to deliver reliable power to your vintage amplifier.

Technical Specs

• Brand: Baldwin (OEM Sylvania)

• Model: 5U4GB

• Type: Full-Wave High-Vacuum Rectifier

• Plate Construction: Black Sylvania Ribbed Plates

• Getter: Top Getter (Chrome Top)

• Test Results Tube 1: 82% / 86% Emissions

• Screening: Passed for Shorts, Opens, and Leakage on a Precision Model 612

Condition Details

Thid tube idls in excellent vintage condition. The glass is clear with substantial chrome flashing at the top, indicating plenty of life remaining. The bases are tight, and the pins are straight and clean. The green Baldwin printing is legible, displaying the "AUJ" batch codes (22 and 29) and "MADE IN 33" identifiers. Electrically, this tube test well into the "Good" range on our calibrated tester, with it testing high.

Historical/Technical Context

The 5U4GB is a ruggedized version of the classic 5U4G, designed to handle higher peak inverse voltages and currents. This specific tubes were manufactured by Sylvania for Baldwin Organs. Organ pulls are prized in the vintage audio community because they were typically subjected to conservative voltages and gentle use compared to guitar amplifiers. The Sylvania black plate construction is widely considered one of the most reliable 5U4GB variants ever made, making this a perfect upgrade for vintage Fender amps or classic Hi-Fi power supplies.

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.