7027A

7027A has no equivalent designation confirmed by the archive.

The 7027A is a beam power tube intended for high-fidelity audio-amplifier applications. It supersedes type 7027. The tube has a unipotential cathode heater rated at 6.3 volts, a small-wafer octal 8-pin base, and a T12 bulb. Maximum seated length is 4.62 inches and maximum diameter is 1.63 inches. The tube can be operated in any position.

Construction

The basing designation for bottom view is 8HY. Pin 1 is grid No. 2; pin 2 is heater; pin 3 is plate; pin 4 is grid No. 2 and grid No. 3; pin 5 is grid No. 1; pin 6 is grid No. 1; pin 8 is cathode.

Ratings

Maximum plate voltage is 600 volts. Maximum grid-No.2 (screen-grid) voltage is 500 volts. Maximum grid-No.2 input is 5 watts. Maximum heater-cathode voltage is 200 volts, with heater either negative or positive with respect to cathode.

Capacitance

The RCA datasheet for the 7027A gives a grid-No.1-to-plate capacitance of 1.5 μμf, a grid-No.1-to-cathode-and-grid-No.3 capacitance of 0.0 μμf, and a plate-to-cathode-and-grid-No.3 capacitance of 7.5 μμf.

Typical Operation

The RCA datasheet for the 7027A gives typical operation values for two tubes in a push-pull class AB amplifier with cathode bias, using a plate supply voltage of 410 volts and a cathode resistor of 220 ohms.

Original manufacturer datasheets for 7027A, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• 7027-A