Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Voltage - Triode (single high frequency) ·Triode

A2521

Low-noise UHF grounded-grid triode for amplification, small-power amplification, or frequency multiplication through approximately 1.25 GHz.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 300 mA

Description

A UHF triode for grounded-grid circuits as a low-noise amplifier, small power amplifier or frequency multiplier at frequencies up to 1250 MHz. The A2521 is a commercial version of the CV2453 except for heater-current rating.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B9A
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Transconductance
0.015 S
Amplification factor
60
Max plate voltage
250 V
Max plate dissipation
2.5 W
Max cathode current
25 mA

Grounded-grid UHF triode.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • PeakAnodeVoltage

    1000 V

  • Peak Cathode Current

    700 mA

    Pulse<2us

  • DCGridCurrentMax

    6 mA

  • small power ampl ifier or frequency multi pi ier at frequencies up to

    1250 MHz

  • Heater voltage

    6.3 V

  • Heater current (approx) - A2521

    300 mA

  • Heater current (approx) - CV2453

    370 mA

  • DC anode voltage

    250 V

    MAXIMUM RATINGS

  • Peak anode voltage

    1000 V

    MAXIMUM RATINGS

  • Anode dissipation

    2.5 W

    MAXIMUM RATINGS

  • DC grid current

    6 mA

    MAXIMUM RATINGS

  • DC cathode current

    25 mA

    MAXIMUM RATINGS

  • Peak cathode current (pulse duration 2/ls)

    700 mA

    MAXIMUM RATINGS

  • Negative dc grid voltage

    20 V

    MAXIMUM RATINGS

  • Peak heater-cathode voltage

    100 V

    MAXIMUM RATINGS

  • Frequency 1250 900 400

    200 MHz

    Typical Operation

  • Vb 180 180 180

    180 V

    Typical Operation

  • la 16 16 16

    16 mA

    Typical Operation

  • 6f (to

    3 dB

    Typical Operation

  • 6f (to 3 dB) 20 50 6

    4 MHz

    Typical Operation

  • tPower gain 9 10 17

    14.5 dB

    Typical Operation

  • t j Noise factor 11 1 9 5 6 7

    4.6 dB

    Typical Operation

  • DC anode voltage

    250 V

    Typical Operation

  • Anode dissipation

    2.5 W

    Typical Operation

  • Peak anode current

    100 mA

    Typical Operation

  • DC grid current

    6 mA

    Typical Operation

  • Positive dc cathode to grid voltage

    20 V

    Typical Operation

  • Frequency 400

    900 MHz

    Typical Operation as Amplifier

  • DC anode voltage 250

    150 V

    Typical Operation as Amplifier

  • Anode dissipation 2

    2.4 W

    Typical Operation as Amplifier

  • DC anode cu rrent 18

    20 mA

    Typical Operation as Amplifier

  • DC grid current 4 5

    2.5 mA

    Typical Operation as Amplifier

  • Positive dc cathode to grid voltage 10 5

    5 V

    Typical Operation as Amplifier

  • Driving power 0 3

    0.45 W

    Typical Operation as Amplifier

  • Load power (approx 2 6

    0.9 W

    Typical Operation as Amplifier

  • Frequency-in 200 133 3 450 300

    416.6 MHz

    Typical Operation as Frequency Multiplier

  • Frequency-out 400 400 900 900

    1250 MHz

    Typical Operation as Frequency Multiplier

  • Va 200 200 140 90

    130 V

    Typical Operation as Frequency Multiplier

  • r g 2 4 2 5 2 4 2 5

    2.4 W

    Typical Operation as Frequency Multiplier

  • la 20 15 20 20

    18.5 mA

    Typical Operation as Frequency Multiplier

  • Ig 3 5 1 5 3 5 3 0

    1.5 mA

    Typical Operation as Frequency Multiplier

  • +Vkil 20 20 15 10

    10.5 V

    Typical Operation as Frequency Multiplier

  • Pdr 0 6 0 55 0 6 1 2

    0.22 W

    Typical Operation as Frequency Multiplier

  • PL (approx) 1 8 0 75 0 7 0 3

    0.05 W

    Typical Operation as Frequency Multiplier

Characteristic

  • Cathode plus heater to grid

    3.5 pF

    CAPACITANCES (Measured on a cold unscreened valve)

  • Anode to grid

    1.6 pF

    CAPACITANCES (Measured on a cold unscreened valve)

  • Cathode plus heater to anode

    0.06 pF

    CAPACITANCES (Measured on a cold unscreened valve)

  • DC anode voltage

    130 V

    CAPACITANCES (Measured on a cold unscreened valve)

  • DC anode current

    16 mA

    CAPACITANCES (Measured on a cold unscreened valve)

  • Negative dc grid voltage (approx)

    1 V

    CAPACITANCES (Measured on a cold unscreened valve)