# Vacuum Tube - 6550, Tung-Sol Reissue

Starting at: $45

^{.95}Product Options

- Apex Matched Sextet (T-6550-TUNG-MS)

Copy of the original type 3 Tung-Sol 6550 made in the 1960s. Triple getter, carbonized screen, and gold plated grid. The current production benchmark of the classic 6550. Made in Saratov, Russia

Matched versions of this tube use Apex Matching

RoHS Compliant

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

Apex Matched Pair | T-6550-TUNG-MP | 609722129800 |

Apex Matched Quad | T-6550-TUNG-MQ | 609722129817 |

Apex Matched Sextet | T-6550-TUNG-MS | 609722129824 |

Single | T-6550-TUNG | 683274021140 |

Bulb Temperature | 250°C | |

Capacitance, grid to plate | 0.8 pF | |

Capacitance, input | 15 pF | |

Capacitance, output | 10 pF | |

Cathode Current (I_{k}) | 190 mA | |

Grid 1 Voltage | -300 V | |

Grid 2 Dissipation | 6 W | |

Grid 2 Voltage, Pentode | 440 V | |

Grid 2 Voltage, Triode | 500 V | |

Grid Circuit Resistance (R_{g}), Fixed Bias | 50 kΩ | |

Grid Circuit Resistance (R_{g}), Self Bias | 250 kΩ | |

Heater Cathode Voltage, Negative | 300 V | |

Heater Cathode Voltage, Positive | 100 V | |

Heater Current | 1.6 A | |

Heater Voltage | 6.3 V | |

Plate Dissipation (W_{a}) | 42 W | |

Plate Voltage (U_{a}) | 660 V |

Packaging Dimensions | Apex Matched Pair version | T-6550-TUNG-MP | 5.6 in. × 4.4 in. × 2.1 in. |

Apex Matched Quad version | T-6550-TUNG-MQ | 5.6 in. × 4.4 in. × 4.4 in. | |

Apex Matched Sextet version | T-6550-TUNG-MS | 6.4 in. × 5.6 in. × 4.4 in. | |

Single version | T-6550-TUNG | 2.1 in. × 2.1 in. × 5.5 in. | |

Weight (Packaging) | Apex Matched Pair version | T-6550-TUNG-MP | 0.45 lbs. |

Apex Matched Quad version | T-6550-TUNG-MQ | 0.9 lbs. | |

Apex Matched Sextet version | T-6550-TUNG-MS | 1.35 lbs. | |

Single version | T-6550-TUNG | 0.225 lbs. |

T-6550-TUNG-MP - Apex Matched Pair version | Bulb Temperature | 250°C |

Capacitance, grid to plate | 0.8 pF | |

Capacitance, input | 15 pF | |

Capacitance, output | 10 pF | |

Cathode Current (I_{k}) | 190 mA | |

Grid 1 Voltage | -300 V | |

Grid 2 Dissipation | 6 W | |

Grid 2 Voltage, Pentode | 440 V | |

Grid 2 Voltage, Triode | 500 V | |

Grid Circuit Resistance (R_{g}), Fixed Bias | 50 kΩ | |

Grid Circuit Resistance (R_{g}), Self Bias | 250 kΩ | |

Heater Cathode Voltage, Negative | 300 V | |

Heater Cathode Voltage, Positive | 100 V | |

Heater Current | 1.6 A | |

Heater Voltage | 6.3 V | |

Plate Dissipation (W_{a}) | 42 W | |

Plate Voltage (U_{a}) | 660 V | |

T-6550-TUNG-MQ - Apex Matched Quad version | Bulb Temperature | 250°C |

Capacitance, grid to plate | 0.8 pF | |

Capacitance, input | 15 pF | |

Capacitance, output | 10 pF | |

Cathode Current (I_{k}) | 190 mA | |

Grid 1 Voltage | -300 V | |

Grid 2 Dissipation | 6 W | |

Grid 2 Voltage, Pentode | 440 V | |

Grid 2 Voltage, Triode | 500 V | |

Grid Circuit Resistance (R_{g}), Fixed Bias | 50 kΩ | |

Grid Circuit Resistance (R_{g}), Self Bias | 250 kΩ | |

Heater Cathode Voltage, Negative | 300 V | |

Heater Cathode Voltage, Positive | 100 V | |

Heater Current | 1.6 A | |

Heater Voltage | 6.3 V | |

Plate Dissipation (W_{a}) | 42 W | |

Plate Voltage (U_{a}) | 660 V | |

T-6550-TUNG-MS - Apex Matched Sextet version | Bulb Temperature | 250°C |

Capacitance, grid to plate | 0.8 pF | |

Capacitance, input | 15 pF | |

Capacitance, output | 10 pF | |

Cathode Current (I_{k}) | 190 mA | |

Grid 1 Voltage | -300 V | |

Grid 2 Dissipation | 6 W | |

Grid 2 Voltage, Pentode | 440 V | |

Grid 2 Voltage, Triode | 500 V | |

Grid Circuit Resistance (R_{g}), Fixed Bias | 50 kΩ | |

Grid Circuit Resistance (R_{g}), Self Bias | 250 kΩ | |

Heater Cathode Voltage, Negative | 300 V | |

Heater Cathode Voltage, Positive | 100 V | |

Heater Current | 1.6 A | |

Heater Voltage | 6.3 V | |

Plate Dissipation (W_{a}) | 42 W | |

Plate Voltage (U_{a}) | 660 V | |

T-6550-TUNG - Single version | Bulb Temperature | 250°C |

Capacitance, grid to plate | 0.8 pF | |

Capacitance, input | 15 pF | |

Capacitance, output | 10 pF | |

Cathode Current (I_{k}) | 190 mA | |

Grid 1 Voltage | -300 V | |

Grid 2 Dissipation | 6 W | |

Grid 2 Voltage, Pentode | 440 V | |

Grid 2 Voltage, Triode | 500 V | |

Grid Circuit Resistance (R_{g}), Fixed Bias | 50 kΩ | |

Grid Circuit Resistance (R_{g}), Self Bias | 250 kΩ | |

Heater Cathode Voltage, Negative | 300 V | |

Heater Cathode Voltage, Positive | 100 V | |

Heater Current | 1.6 A | |

Heater Voltage | 6.3 V | |

Plate Dissipation (W_{a}) | 42 W | |

Plate Voltage (U_{a}) | 660 V |

Specification Sheet | All Models |

## My Project Lists

## Specifications, Files, and Documents

## Questions and Answers

Click each question to see its answers.

1 answers
How are the tubes matched?

Asked by

*Anonymous*on December 28th, 2017.
We match these tubes with our proprietary Apex matching system.

## Substitute Products

The following items can be substituted for this product. While not necessarily exactly the same, they will function as replacement items in your project.

## Product Reviews

Major improvement for 1959 Leslie 47 amplifier. These sound wonderful. Tested balanced and matched per Apex. Reasonable cost. Very pleased.

Excellent quality and no gas.

I installed a quad of these in my Conrad-Johnson Premier 11 power amp in place of a set of EHX. I bought the amp used and one of the power tubes was starting to fail so I decided to replace all four. I read some reviews for hifi use and I’m glad I went with the Tung-Sol’s. They sound great. Lots of power, lots of detail and not too bright. You need to burn them in for at least. 24 hours for them to sound their best.