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

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SKU:	T-12AT7-GOLD-GEN
Item ID:	039534

Price: $42^.95

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Type

Preamplifier Gold Pin

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.

UPC/EAN: 841358101687

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Specification Sheet

1.88 MB

Product Measurements (click to expand)

Product Measurements
Amplification Factor		≥ 50
Capacitance, Transfer		1.6 pF
Capacitance, input		2.5 pF
Capacitance, output		0.4 pF
Cathode to Heater Voltage		200 V
Grid Circuit Resistance (R_g), Automatic Bias		1 MΩ
Grid Circuit Resistance (R_g), Fixed Bias		0.25 MΩ
Grid Reverse Current		0.5 μA
Heater Current		165 mA - 330 mA
Heater Voltage		6.0 - 6.6 V / 12.0 - 13.2 V
Plate Current (I_a)		18 mA
Plate Dissipation, per triode (W_a)		3.25 W
Plate Voltage (U_a)		330 V
Transconductance (S)		≥ 4.5 mA/V

Packaging Information
Packaging Dimensions		2.75 in. × 1 in. × 1 in.
Weight (Packaging)		0.039 lbs.

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Do these work in an Ampeg SVT 4 Pro pre amp? 1 answers

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Asked by Anonymous on May 30th, 2019.

Answers (1)

BradWbr

Staff Member

May 30th, 2019

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.

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Doesn't anyone know the original Genalex preamp tubes were ALL rebranded Mullards? I meet up with an old mate of mine who worked for Genalex, and Pye Radio in The UK. Granted all the surviving GEC employees, I know, still love to bash Mullard, probably because GEC pretested all the stuff they bought from Mullard. If it is not a kinkless tetrode, it is not really a Genalex. The Mullard Master 10M gold label, was equal to or better than the GEC-MOV stuff, and was also pretested and specially selected. 0 answers

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Asked by Anonymous on March 2nd, 2017.

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