SED 12ax7 DATASHEETS
12AX7 HIGH-MU TWIN
AUDIO TRIODE
The Svetlana™ 12AX7 is a miniature glass-envelope small-
signal dual triode intended for use as a low-noise preamplifier for
audio applications. It is a direct plug-in replacement for any
12AX7, 7025 or ECC83 in music or audio amplifiers. All ratings
of the Svetlana 12AX7 meet or exceed those of the original
version; top-quality cathode materials and extensive aging yield
outstanding performance in high-fidelity amplifiers. The Svetlana
12AX7 is made exclusively at the Svetlana Electron Devices
factory in St. Petersburg, Russia, and is marketed worldwide by
PM Components Ltd. and in the USA by PM of America Inc.
TYPICAL MECHANICAL AND ELECTRICAL PARAMETERS
Electrical
Cathode Oxide-coated, unipotential
Heater voltage (AC or DC) 12.6 volts AC or DC (+-
0.6 volts), center-tapped
Heater current 150 mA (12.6v) or 300 mA
(6.3v)
Heater-cathode voltage +-200 volts peak
Amplification factor (nominal) 100
Transconductance (nominal) 1600 uS
Plate resistance (nominal) 62,500 ohms
Typical equivalent hum and noise voltage,
per section, rms averaged, Rg=0 1.8 uV
Interelectrode capacitances (typical),
per section, with cathode grounded:
Input 1.6 pF
Output 0.46 pF max
Grid to anode 1.7 pF
Base standard 9-pin miniature,
glass button
Basing diagram JEDEC 9A
Socket 9-pin
miniature
Operating position Any
____________________________________________________________
HEADQUARTERS: CERAMIC TUBE DIVISION:
1687 Shelby Oaks Drive 895 B. Street PMB #481
Suite 8 Hayward, CA 94541
Memphis, TN 38134 Phone / Fax: 510-885-1247
Phone: 901-388-2424
Fax: 901-388-2405
www.svetlanausa.com
Nominal dimensions:
Height of glass envelope 46.5 mm (1.835 inches)
Diameter of glass envelope 22 mm (0.867 inches)
Overall height 55.5 mm (2.180 inches)
Net weight 15 grams
Maximum ratings:
Anode voltage, DC 330 volts
Anode dissipation, per triode 1.2 watts
Cathode current, continuous, per triode 10 mA
Positive DC grid voltage 0 volts
Negative DC grid voltage -50 volts
Maximum grid-circuit resistance 10.0 megohms
Typical Application: Class A1 Small-Signal Amplifier, either section
Anode supply voltage 300 volts
Anode load resistor 100,000 ohms
Cathode bias resistor 1000 ohms
Max. output voltage swing
at 5% THD, nominal 40 v rms
____________________________________________________________
HEADQUARTERS: CERAMIC TUBE DIVISION:
1687 Shelby Oaks Drive 895 B. Street PMB #481
Suite 8 Hayward, CA 94541
Memphis, TN 38134 Phone / Fax: 510-885-1247
Phone: 901-388-2424
Fax: 901-388-2405
www.svetlanausa.com
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