General Electric 5Z3 Rectifier Tube 1949 Black Plates - Tested

Superior Sound Supply selling some seriously special stock. This 1949 General Electric 5Z3 is a genuine piece of audio history, offering the authentic "sag" and natural compression that only a vintage directly heated rectifier can provide. Professionally vetted on our Precision Model 612 tester, this tube is an excellent candidate for restoring pre-war radios or powering boutique vintage-style amplifiers.

Technical Specs

• Model: 5Z3 (Full-Wave Rectifier)
• Brand: General Electric (GE)
• Date Code: 9-35 (35th week of 1949)
• Base Type: 4-Pin UX-4
• Plate Type: Smooth Black Plates
• Filament: Directly Heated / Hanging Filament
• Test Results: Pass for Shorts/Leakage. Note: Please verify the emissions reading in the listing photos to ensure it meets your specific bias requirements.

Condition Details

This 75-year-old specimen is in respectable cosmetic condition. The glass envelope is clear and free of cracks or loose particles. The "Electronic Tube" branding and "9-35" date codes are etched in white and remain sharp and legible. The large 4-pin base is solid with no looseness, and the pins show expected oxidation from age but are serviceable. Internally, the hanging filament structure and black plates are mechanically sound.

Historical & Technical Context

The 5Z3 is the direct 4-pin predecessor to the legendary 5U4G. While it shares the same electrical characteristics—including a 5V filament and high current capacity—it utilizes the older UX-4 base found in 1930s and 40s equipment. It is highly sought after for its ability to deliver a "faster," more transparent sound with a distinct vintage bloom that solid-state diodes cannot replicate. This is a vital component for maintaining the authenticity of pre-WWII electronics.

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 you're 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.