7AN7

7AN7 is also designated PCC84.

Description

The 7AN7 is a double triode designed for use as an RF cascode amplifier in television tuners up to 220 Mc. It has a coated unipotential cathode, a small button Noval 9-pin base, and a T64 bulb. The maximum diameter is 7/8 inch, the maximum overall length is 2 3/16 inches, and the maximum seated height is 1 15/16 inches.

Ratings

Each section of the 7AN7 has a maximum plate voltage of 180 volts, a maximum plate dissipation of 2 watts, a maximum cathode current of 18 mamps, and a maximum negative grid bias of 50 volts. The maximum supply voltage without current is 550 volts. The maximum grid circuit resistance for section 1 is 0.5 megohm. The maximum voltage between cathode and heater for section 1 is 90 volts. For section 2, the maximum voltage between cathode and heater is 90 volts with the heater positive with respect to the cathode, and 250 volts peak with the heater negative with respect to the cathode. The maximum circuit resistance between cathode and heater is 20,000 ohms. The maximum grid leak for section 2 is 20,000 ohms when connected according to fig.A.

Characteristics

The typical characteristics for each section at a plate voltage of 90 volts and grid bias of -1.5 volts are a plate current of 12 mamps, a transconductance of 6000 micromhos, and an amplification factor of 24. In a cascode amplifier, triode section No.1 should be used as the grounded cathode amplifier and triode section No.2 as the grounded grid amplifier. The typical grid bias for the grounded grid section can be achieved with a decoupled cathode resistor of a typical value of 120 ohms.

High-Frequency Performance

The noise figure for the 7AN7 is 6.5 with a bandwidth of the input circuit of 7-8 Mc. The input conductance at 200 Mc is 250 micromhos. A noise figure of about 5 can be obtained when the two cathode leads are connected in parallel; the input conductance at 200 Mc then increases to about 700 micromhos.

Capacitances

For triode section 1, the input capacitance is 2.3 μμF, the output capacitance is 0.45 μμF, the plate-to-grid capacitance is 1.2 μμF, and the maximum grid-to-filament capacitance is 0.25 μμF. For triode section 2, the cathode-to-grid plus heater capacitance is 4.7 μμF, the plate-to-grid plus heater capacitance is 2.5 μμF, the plate-to-cathode capacitance is 0.16 μμF, the cathode-to-heater capacitance is 2.7 μμF, and the plate-to-grid capacitance is 2.3 μμF. The capacitance between plate section 1 and cathode section 1 plus heater plus grid section 2 is 1.2 μμF, and the maximum capacitance between grid section 1 and plate section 2 is 0.006 μμF.

Heater

The 7AN7 heater requires 7 volts at 0.3 amp.

Equivalence is asserted only where the archive's own literature states it directly, in at least 40 separate documents. Tubes that merely substitute in some circuits are not listed here.

Base NOVAL, viewed from below (the wiring side), pins numbered clockwise from the key. Read from the datasheet's basing table and checked against it automatically — confirm against the original datasheet before wiring.

Original manufacturer datasheets for 7AN7, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• VYSOKOFREKVENČNÍ DVOJITÁ TRIODA (filed under PCC84)
• 7AN7

2 further designations appear alongside 7AN7 in the literature but below the evidence threshold used here, so they are not listed as equivalent.