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Sylvania Pair of 810 Vacuum Tubes, High Power Transmitting Triodes Used, Tested, in Excellent Condition

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MPN:
810
Condition:
Used
Shipping:
$12.00 (Fixed Shipping Cost)
  • Sylvania Pair of 810 Vacuum Tubes, High Power Transmitting Triodes Used, Tested, in Excellent Condition
  • Sylvania Pair of 810 Vacuum Tubes, High Power Transmitting Triodes Used, Tested, in Excellent Condition
$139.99
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Description

Sylvania Pair of 810 Vacuum Tubes, High Power Transmitting Triodes Used, Tested, in Excellent Condition

  **All the tubes I sell are tested and come with a money back, satisfaction guarantee**

  Each one of the stock I have, has been tested in a Collins KW-1, 1000 watt transmitter at FULL Modulation, and are all performing up to spec with no problems.

This is the only way to make sure they are good and the ability to compare many 810 tubes in the KW-1, assures RELIABLE comparative testing.

I will combine the shipping and refund any difference.

These tubes were tested in a Collins KW-1 transmitter where it was operated and tested at full modulation.
 
They deliver strong, reliable performance with no detectable issues in emission, gas, or shorts.
 
These tubes were proven under real-world high-power AM conditions, making them ideal for Collins KW-1 owners, vintage AM transmitters, modulators, or RF power amplifier projects.
 
 
Sylvania 810 tubes are high-quality, American-made high-power transmitting triodes prized by vintage radio enthusiasts and restorers for their rugged construction and reliable performance in modulator and RF service. Sylvania Electric Products was a major U.S. manufacturer of vacuum tubes, with a long history of producing both receiving and transmitting types to high standards.Manufacturing BackgroundSylvania began as a lamp company in Emporium, Pennsylvania, in the early 1900s. The company built its first dedicated radio tube factory there in 1924 and expanded significantly over the decades. Tube manufacturing occurred primarily at the Emporium plant, where skilled workers assembled tubes with careful quality controls, precise electrode alignment, and controlled vacuum processes. Like other major U.S. makers (GE, RCA, Ken-Rad), Sylvania produced transmitting tubes such as the 810 using robust materials, including thoriated-tungsten filaments and graphite anodes, to handle high voltages and power dissipation. Many Sylvania tubes, including military versions, met or exceeded JAN (Joint Army-Navy) specifications for durability and consistency during the post-WWII era. Sylvania 810s typically feature the classic large glass envelope with a 4-pin base, black or gray plates, and strong getters—hallmarks of mid-20th-century American industrial craftsmanship.The 810 is a high-mu power triode with a directly heated 10V / 4.5A thoriated-tungsten filament, graphite plate, and ratings that support plate voltages up to 2,000–2,500 V and 250 W plate dissipation (ICAS). It delivers excellent power output in Class C service (hundreds of watts) and shines in audio modulator applications thanks to its high perveance and linear characteristics.
Quality of Your Old Stock Sylvania 810 TubesThese old stock Sylvania 810 tubes represent excellent vintage American quality:
  • Proven real-world testing: Each tube has been carefully tested in a real Collins KW-1 transmitter running at full modulation. They performed flawlessly under maximum load—delivering 100% modulation with no arcing, no distortion, and stable operation. This rigorous, in-rig testing far exceeds typical emission checks and confirms their readiness for demanding service.
  • Excellent cosmetic condition: Pristine appearance with clear glass, sharp markings, intact bases, and minimal wear—perfect for both operational use and display in restored equipment.
  • Old stock advantage: As U.S.-made tubes from Sylvania’s Emporium-era production, they offer the consistency, longevity, and authentic “sound” that collectors and operators seek in vintage Collins, broadcast, or audio gear.
 
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