Philips Set of 3 Matched 12JB6 NOS Tubes for the TR-3, and TR-4 Series RL Drake Radios, Tested & Guaranteed

Philips Set of 3 Matched 12JB6 NOS Tubes for the TR-3, and TR-4 Series RL Drake Radios, Tested & Guaranteed.

This is the set needed for TR-4, TR-4C, TR-4CW and TR-4CWrit as well as the TR-3.

I purchased this set from RL Drake around 25 years ago when they were selling out their Amateur Radio Products.

 There were not in boxes but were wrapped in brown puffy paper.

I will provide white boxes for them.

They are New Old Stock in excellent condition, and tests full grid emission.

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

This tube comes with a money back, satisfaction guarantee.

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The 12JB6 (and its close variant, the 12JB6A) is a miniature beam power pentode vacuum tube, originally designed in the late 1950s for use in horizontal deflection circuits in black-and-white televisions. It has since found popularity in amateur (HAM) radio equipment, such as linear amplifiers (e.g., Drake LA-4) and transmitters (e.g., Drake TR-3/4 or Collins models), where matched sets are valued for balanced performance in push-pull configurations. Philips (a Dutch manufacturer, often via its ECG or Mullard subsidiaries) produced these tubes primarily in the 1960s-1970s, with European construction that sometimes appeals to collectors for its durability and subtle differences in plate structure compared to U.S. brands like RCA or Sylvania.Key Specifications

• Base: 9-pin Novar (Compactron-style) with an additional top cap anode connection for high-voltage handling.
• Heater: 12.6V parallel (1.2A) or 6.3V series (0.6A); indirectly heated.
• Maximum Ratings:
• Plate Voltage: 600V
• Plate Dissipation: 19W
• Screen Voltage: 250V
• Cathode Current: 100mA max
• Typical Characteristics (at 250V plate, 22.5V bias, 200V screen):
• Transconductance (Gm): 9,000 µmhos
• Plate Current (Ip): 70mA
• Amplification Factor (mu): 20
• Physical: ~2.5" tall, 1.25" diameter; glass envelope with halo or O-getter (Philips often feature D-getter or ribbed plates for better heat dissipation).
• Equivalents/Substitutes: 17JB6/A (higher heater voltage), 6JB6/A (6.3V heater, lower power), or 17.5W types like Lindal 17JB6A for long-life applications.

Philips-Specific Notes: Philips/ECG versions are typically military-grade (JAN spec possible), with gray or ribbed plates and clear tops. They test strong on calibrated testers