# Vacuum Tube - 7591A, Tung-Sol Reissue

Tung Sol 7591A beam-power tube. Made in Russia.

Measurement from base to the top of the glass (pins not included in measurement): Slightly under 3"

Single or Matched | Our Part Number | UPC/EAN |
---|---|---|

Single | T-7591A-TUNG | 841358102332 |

Matched Pair | T-7591A-TUNG-MP | 841358102349 |

Matched Quad | T-7591A-TUNG-MQ | 841358102356 |

Amplification Factor | 16.8 | |

Body Height | 2.75 in. | |

Capacitance, grid to plate | 0.25 pF | |

Capacitance, input | 10 pF | |

Capacitance, output | 5.0 pF | |

Cathode Current (I_{k}) | 85 mA | |

Grid 1 Voltage | -10 V | |

Grid Circuit Resistance (R_{g}), Cathode Bias | 1.0 MΩ | |

Grid Circuit Resistance (R_{g}), Fixed Bias | 0.3 MΩ | |

Harmonic Distortion | 13 % | |

Heater Cathode Voltage, Negative | 200 V | |

Heater Cathode Voltage, Positive | 100 V | |

Heater Current | 0.8 A | |

Heater Voltage | 6.3 V | |

Item Diameter | 1.28125 in. | |

Item Height | 3.3125 in. | |

Load Resistance | 3 kΩ | |

Plate Current, max signal (I_{a}) | 75 mA | |

Plate Current, zero signal (I_{a}) | 60 mA | |

Plate Dissipation (W_{a}) | 19 W | |

Plate Resistance (R_{a}) | 29 kΩ | |

Plate Voltage (U_{a}) | ≤ 550 V, 300 V typical | |

Power Output | 11 W | |

Screen Current, max signal | 15 mA | |

Screen Current, zero signal | 8 mA | |

Screen Dissipation | 3.3 W | |

Screen Voltage | ≤ 440 V, 300 V typical | |

Transconductance (S) | 10,200 μmhos |

Packaging Dimensions | Matched Pair version | T-7591A-TUNG-MP | 4.9 in. × 3.5 in. × 1.8 in. |

Matched Quad version | T-7591A-TUNG-MQ | 4.9 in. × 3.5 in. × 1.8 in. | |

Single version | T-7591A-TUNG | 4.75 in. × 1.65 in. × 1.65 in. | |

Weight (Packaging) | Matched Pair version | T-7591A-TUNG-MP | 0.292 lbs. |

Matched Quad version | T-7591A-TUNG-MQ | 0.584 lbs. | |

Single version | T-7591A-TUNG | 0.146 lbs. |

T-7591A-TUNG-MP - Matched Pair version | Amplification Factor | 16.8 |

Body Height | 2.75 in. | |

Capacitance, grid to plate | 0.25 pF | |

Capacitance, input | 10 pF | |

Capacitance, output | 5.0 pF | |

Cathode Current (I_{k}) | 85 mA | |

Grid 1 Voltage | -10 V | |

Grid Circuit Resistance (R_{g}), Cathode Bias | 1.0 MΩ | |

Grid Circuit Resistance (R_{g}), Fixed Bias | 0.3 MΩ | |

Harmonic Distortion | 13 % | |

Heater Cathode Voltage, Negative | 200 V | |

Heater Cathode Voltage, Positive | 100 V | |

Heater Current | 0.8 A | |

Heater Voltage | 6.3 V | |

Item Diameter | 1.28125 in. | |

Item Height | 3.3125 in. | |

Load Resistance | 3 kΩ | |

Plate Current, max signal (I_{a}) | 75 mA | |

Plate Current, zero signal (I_{a}) | 60 mA | |

Plate Dissipation (W_{a}) | 19 W | |

Plate Resistance (R_{a}) | 29 kΩ | |

Plate Voltage (U_{a}) | ≤ 550 V, 300 V typical | |

Power Output | 11 W | |

Screen Current, max signal | 15 mA | |

Screen Current, zero signal | 8 mA | |

Screen Dissipation | 3.3 W | |

Screen Voltage | ≤ 440 V, 300 V typical | |

Transconductance (S) | 10,200 μmhos | |

T-7591A-TUNG-MQ - Matched Quad version | Amplification Factor | 16.8 |

Body Height | 2.75 in. | |

Capacitance, grid to plate | 0.25 pF | |

Capacitance, input | 10 pF | |

Capacitance, output | 5.0 pF | |

Cathode Current (I_{k}) | 85 mA | |

Grid 1 Voltage | -10 V | |

Grid Circuit Resistance (R_{g}), Cathode Bias | 1.0 MΩ | |

Grid Circuit Resistance (R_{g}), Fixed Bias | 0.3 MΩ | |

Harmonic Distortion | 13 % | |

Heater Cathode Voltage, Negative | 200 V | |

Heater Cathode Voltage, Positive | 100 V | |

Heater Current | 0.8 A | |

Heater Voltage | 6.3 V | |

Item Diameter | 1.28125 in. | |

Item Height | 3.3125 in. | |

Load Resistance | 3 kΩ | |

Plate Current, max signal (I_{a}) | 75 mA | |

Plate Current, zero signal (I_{a}) | 60 mA | |

Plate Dissipation (W_{a}) | 19 W | |

Plate Resistance (R_{a}) | 29 kΩ | |

Plate Voltage (U_{a}) | ≤ 550 V, 300 V typical | |

Power Output | 11 W | |

Screen Current, max signal | 15 mA | |

Screen Current, zero signal | 8 mA | |

Screen Dissipation | 3.3 W | |

Screen Voltage | ≤ 440 V, 300 V typical | |

Transconductance (S) | 10,200 μmhos | |

T-7591A-TUNG - Single version | Amplification Factor | 16.8 |

Body Height | 2.75 in. | |

Capacitance, grid to plate | 0.25 pF | |

Capacitance, input | 10 pF | |

Capacitance, output | 5.0 pF | |

Cathode Current (I_{k}) | 85 mA | |

Grid 1 Voltage | -10 V | |

Grid Circuit Resistance (R_{g}), Cathode Bias | 1.0 MΩ | |

Grid Circuit Resistance (R_{g}), Fixed Bias | 0.3 MΩ | |

Harmonic Distortion | 13 % | |

Heater Cathode Voltage, Negative | 200 V | |

Heater Cathode Voltage, Positive | 100 V | |

Heater Current | 0.8 A | |

Heater Voltage | 6.3 V | |

Item Diameter | 1.28125 in. | |

Item Height | 3.3125 in. | |

Load Resistance | 3 kΩ | |

Plate Current, max signal (I_{a}) | 75 mA | |

Plate Current, zero signal (I_{a}) | 60 mA | |

Plate Dissipation (W_{a}) | 19 W | |

Plate Resistance (R_{a}) | 29 kΩ | |

Plate Voltage (U_{a}) | ≤ 550 V, 300 V typical | |

Power Output | 11 W | |

Screen Current, max signal | 15 mA | |

Screen Current, zero signal | 8 mA | |

Screen Dissipation | 3.3 W | |

Screen Voltage | ≤ 440 V, 300 V typical | |

Transconductance (S) | 10,200 μmhos |

Specification Sheet | All Models |

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## Questions and Answers

Click each question to see its answers.

3 answers
I noticed your web page doesn't specify Apex matching on Tung Sol 7591A tube sets. Is Apex Matching available on TungSol 7591A tubes?

Asked by

*Anonymous*on November 22nd, 2016.
We currently only offer Apex matching on the JJ 7591A.

Will the Tung_Sol 7591A fit in a Eico ST-20 amplipher?

These tubes measure 2.86" high. You will need to measure the space in your amp to verify.

1 answers
What are the size differences in all the 7591 tubes?

Asked by

*Anonymous*on November 22nd, 2016.
They are all similar in size with the exception of the Tung Sol which is shorter by just shy of a half inch.

1 answers
I would like to find out the height of the Tung-Sol 7591A from the base of the tube to the top.
I am trying to find a tube to put in a Heathkit AA-100 amp and the origional 7591 just fits in the case. All the tubs on the market today are to high and cannot find a data sheet on the Tung-Sol.

Asked by

*Anonymous*on November 22nd, 2016.
From the base of the tube to the top I'm getting a measurement of around 2-3/4" maybe just a bit more but definitely shy of 3".

1 answers
WHO AND WHAT NUMBER 7591A OR 7591 TUBE IS SHORTER HEIGHT

Asked by

*Anonymous*on January 30th, 2019.
This tube measures 2.87" tall not including the pins while the JJ 7591 measures 3.11" tall excluding the pins. This tube is shorter than the JJ 7591.

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