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EF Johnson Branded Pair of RCA 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)
$179.99
Frequently bought together:

Description

EF Johnson Branded Pair of RCA 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**

E.F. Johnson Company did not manufacture the 810 tubes themselves. The company, founded in 1923 in Waseca, Minnesota, produced ham radio transmitters (notably the Viking series starting in 1949), variable capacitors, high-quality ceramic tube sockets (including jumbo 4-pin ones specifically for 810/811/805/etc. tubes), and other components. They sourced and used standard 810 tubes in the modulator sections of their Viking 500 Amplifier 1950s/early 1960s). These were likely for the Johnson Viking 500 Desk Kilowatt Amplifier.
 
The 810 tube type itself is a classic RCA-designed power triode (introduced around 1938–1940) for Class B audio modulation and RF applications. It was primarily manufactured in the USA by major tube makers like RCA (main producer, plants in Harrison, NJ area and elsewhere) The EF Johnson branded 810 are most certainly  made by RCA

  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.

 If you need to order multiple 810 tubes I will combine the shipping and refund any difference.

This is a genuine RCA 810 high-mu power triode, tested in a Collins KW-1 transmitter where it was operated and tested at full modulation.
 
It delivers 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.
 
 
Key Features & Condition:
  • Manufacturer: RCA (Harrison, NJ plant – classic USA-made transmitting tube)
  • Cosmetics: Excellent – clean glass envelope, strong markings, minimal wear for its age. Similar in appearance to the tube pictured (bright, clear, no major discoloration or damage).
  • Performance: Tested good at full modulation in a Collins KW-1. At or near full original specs for plate dissipation and output.
  • Date Code Examples: Most date codes indicate they were manufactured at the RCA manufacturing plant in Harrison, New Jersey (the historic Edison lamp works facility acquired by RCA in 1930). This was the primary site for most RCA receiving and transmitting/power tubes, including many industrial and ham radio types like the 810. Some later RCA production shifted to other plants (e.g., Lancaster, PA, was more focused on picture tubes and certain power types), but Harrison was the core facility for tubes like these.
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