Sylvania 5963 (12AT7) Preamp Tube 1960s USA - Tested

Superior Sound Supply is selling some seriously special stock— this Sylvania 5963 vacuum tube represents top-quality, long-life, and reliable construction from the U.S. manufacturing era. The 5963 is the industrial and computer-rated equivalent of the popular 12AU7/ECC82 tube type, known for its robustness and clarity.

Technical Specifications

• Item Type: Vacuum Tube (Preamp/Driver/Industrial)
• Model/Type: 5963
• Equivalent Types: 12AU7, ECC82, 5814
• Condition: NOS (New Old Stock)
• Manufacturer: Sylvania (Made in USA)
• Manufacturing Era: Estimated 1960s (Mid-to-Late)
• Quantity Available: 1
• Construction: Gray Plates, Halo Top Getter, Chrome Dome
• Factory Code: GJAKN
• Known Applications: Hi-Fi Audio, Guitar/Tube Amps (as 12AU7 equivalent), Industrial Circuits
• Test Results (Precision 612 Emissions Tester):
• • Functional Status: Fully tested and working
  • Shorts/Leakage: No shorts, no opens, no leaks (Implied by Good test reading)
  • Emission Rating: Excellent, reading solidly in the GOOD range (approx. 80%+ on the scale)
• Original Packaging: Yes, Original Sylvania box included.

Condition Details

This Sylvania 5963 tube is in NOS (New Old Stock) condition. The tube is fully tested and working, showing strong emission performance consistent with a new tube. Cosmetically, the glass is clear with strong internal silvering (getter flash) and clean pins. The original Sylvania box is included but is in OK condition with typical wear and tear expected from vintage original packaging.

Historical/Technical Context

The 5963 was specifically designed for demanding computer applications, meaning it was manufactured to stricter standards for long-life (up to 10,000+ hours) and the ability to operate under cut-off conditions for extended periods without degradation. Incorporating this tested vintage double triode into a modern audio circuit, such as a guitar amp or hi-fi pre-amp, provides the clean, reliable tone of a 12AU7 equivalent with superior, rugged build quality.

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.