14B6 — Duplex-Diode High-Mu Triode
The 14B6 is a loctal-base vacuum tube combining a high-mu triode and two independent diode units within a single envelope. It is designed primarily for use in receiving equipment as a combined detector, amplifier, and automatic volume control component. The tube features an indirectly heated cathode and is configured with a loctal base.
Physical Construction and Basing
The 14B6 is housed in a glass envelope with a loctal base. Its physical dimensions are characterized by a maximum diameter of 1-3/16 inches, a maximum overall length of 2-23/32 inches, and a maximum seated height of 2-1/8 inches.
The tube utilizes the 8W base connection diagram, which provides the following pin assignments when viewed from the bottom of the base:
The heater connections are located at pins 1 and 8, while the cathode is accessible via pins 4 and 7. The triode section's control grid and plate are connected to pins 3 and 2, respectively. The two diode plates are connected to pins 5 and 6.
Heater and Maximum Ratings
The 14B6 is equipped with an indirectly heated cathode. The heater is designed to operate under the following nominal electrical conditions:
- Heater Voltage: 12.6 V
- Heater Current: 0.15 A
The maximum anode rating for the triode section is:
- Maximum Plate Voltage: 300 V
Class A Electrical Characteristics
The triode section of the 14B6 is designed for high-mu voltage amplification. The electrical characteristics under typical Class A amplifier operating conditions are documented at two distinct plate voltage levels:
At both operating points, the triode maintains a high amplification factor of 100, while the plate resistance increases and transconductance decreases at the lower plate voltage of 100 V.
Related Designations
The 14B6 is closely related to the 7B6 vacuum tube. For additional application and operating information beyond the basic ratings, reference is made to the 7B6 type, which shares similar electrical characteristics but may differ in heater configuration or other specific parameters.
Technical Summary
The 14B6 is a duplex-diode high-mu triode featuring a loctal base and an indirectly heated cathode. Operating with a 12.6 V, 0.15 A heater, it provides a high-mu triode section with an amplification factor of 100 alongside two independent diode sections. With a maximum plate voltage rating of 300 V, the triode section is capable of operating as a Class A amplifier, delivering transconductance up to 1,100 9mhos and plate resistance of approximately 91,000 to 110,000 ohms depending on the operating point.
