NEC 6JS6C Used Pair of Tubes for the Yaesu FT-101 Series Transceivers Tested & Guaranteed

NEC 6JS6C Used Pair of Tubes for the Yaesu FT-101 Series Transceivers Tested & Guaranteed

 This tube and all others, has been tested on a B&K Dynaquick 700 Tube tester. It shows grid full emission.

The 6JS6C is a vintage vacuum tube classified as a compactron beam power pentode. It was originally designed for use as a horizontal deflection amplifier (commonly called a "sweep tube") in color television receivers during the 1960s and 1970s. These tubes are known for their rugged construction, high power handling, and low interelectrode capacitances, which make them suitable for RF amplification in amateur radio applications despite their TV origins. They were produced by major manufacturers like General Electric (GE), RCA, Sylvania, and Raytheon

Typical Operation (as Horizontal Deflection Amplifier):

• Plate Voltage: 800–1000 V
• Screen Voltage: 200–250 V
• Grid 1 Bias: -20 to -50 V
• Peak Cathode Current: Up to 1.0 A
• These ratings allow for high-efficiency operation in pulsed or Class C RF amplifiers, common in ham rigs.

exclusively associated with the Yaesu FT-101 series—no other major transceiver models are documented as using it in their finals. (Some linear amplifiers, like certain Ameritron models, used similar sweep tubes such as 6JM6, but not the 6JS6C specifically.)Yaesu FT-101 Series Overview  This line of HF SSB/CW/AM transceivers (80–10 meters, plus optional 6 meters in some variants) was produced from 1971–1980 and remains popular for restoration due to its modular design and performance. The 6JS6C tubes form the push-pull final amplifier stage, driven by a 12BY7A pentode, delivering:

• Output Power: ~130 W PEP SSB, 90 W CW, 40 W AM (with two tubes).
• Pi-Network Matching: Transforms the tubes' ~3000 Ω output impedance to 50 Ω antenna impedance.
• Neutralization: Requires a 10 pF capacitor (often supplied); some mods add a series disk cap for stability.