Vacuum Tube - 7581A, Tung-Sol Reissue

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Vacuum Tube - 7581A, Tung-Sol Reissue

Starting at: $28.95
In stock

Rated for more power than the standard 7581 (35W plate dissipation vs 30W plate dissipation).

RoHS Compliant
Item ID:
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Matched PairT-7581A-TUNG-MP0084135811050
Matched QuadT-7581A-TUNG-MQ0084135811051
Product Measurements
Body Height3.688 in.
Capacitance, grid to plate0.6 pF
Capacitance, input10 pF
Capacitance, output6.5 pF
Grid 1 Voltage-14 V
Grid Circuit Resistance (Rg), Cathode Bias0.5 MΩ
Grid Circuit Resistance (Rg), Fixed Bias0.1 MΩ
Heater Current900 mA
Heater Voltage6.3 V
Heater to cathode voltage (Uk/f)200 V
Item Diameter1.562 in.
Item Height4.25 in.
Plate Current, pentode (Ia)210 mA
Plate Current, triode (Ia)72 mA
Plate Dissipation (Wa)30 W
Plate Resistance (Ra)22.5 KΩ
Plate Voltage, pentode (Ua)≤ 500 V, 70 V typical
Plate Voltage, triode (Ua)≤ 450 V, 250 V typical
Screen Current, pentode25 mA
Screen Current, triode5 mA
Screen Dissipation5 W
Screen Voltage, pentode≤ 450 V, 300 V typical
Transconductance (S)6,000 μmhos
Packaging Information
Packaging DimensionsMatched Pair version4.75 in. × 3.5 in. × 1.75 in.
Matched Quad version4.75 in. × 3.5 in. × 3.5 in.
Single version1.5 in. × 1.5 in. × 4 in.
Weight (Packaging)Matched Pair version0.262 lbs.
Matched Quad version0.524 lbs.
Single version0.131 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet3.94 MB

Questions and Answers

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Asked by Anonymous on July 5th, 2018.
July 5th, 2018
Staff Member
These are matched by the manufacturer and they are not apex matched.

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