Vacuum Tube - 12AT7 / B739, Genalex Gold Lion, Gold Pin

Vacuum Tube - 12AT7 / B739, Genalex Gold Lion, Gold Pin

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Genalex Gold Lion ECC81/B739 (12AT7) dual triode preamp tube with gold pins. Made in Russia. Original Genalex Gold Lion ECC81/B739 tubes are considered the best 12AT7 types ever made. They are also among the rarest types available. They exhibit a large detailed soundstage that is characterized by an expressive midrange, deep tight bass, and a smooth extended high end. The reissue Genalex Gold Lion ECC81/B739 recreates the sound signature of the original. This tube features balanced sections and gold plated pins.

Item ID:
Product Measurements by Type
Amplification Factor≥ 50
Capacitance, Transfer1.6 pF
Capacitance, input2.5 pF
Capacitance, output0.4 pF
Cathode to Heater Voltage200 V
Grid Circuit Resistance (Rg), Automatic Bias1 MΩ
Grid Circuit Resistance (Rg), Fixed Bias0.25 MΩ
Grid Reverse Current0.5 μA
Heater Current165 mA - 330 mA
Heater Voltage6.0 - 6.6 V / 12.0 - 13.2 V
Plate Current (Ia)18 mA
Plate Dissipation, per triode (Wa)3.25 W
Plate Voltage (Ua)330 V
Transconductance (S)≥ 4.5 mA/V
Packaging Information
Packaging Dimensions2.75 in. × 1 in. × 1 in.
Weight (Packaging)0.039 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet1.88 MB

Questions and Answers

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Asked by Anonymous on May 30th, 2019.
May 30th, 2019
Staff Member
The Ampeg website states that the SVT 4 Pro uses 12AX7 tubes, but if you were looking to reduce the gain in your amp, these might be good replacements.
Asked by Anonymous on March 2nd, 2017.
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