# Vacuum Tube - 6550, JJ Electronics

Starting at: $56

^{.95}Product Options

- Apex Burned-In Matched Quad (T-6550-JJ-MQB)

This product has substitutes available! Check them out.

The JJ Electronic 6550 is a robust tube built in the rugged fashion that JJ is famous for. At 35 Watts, these tubes have a warm round tone with a thick and defined low end. The JJ 6550 is an excellent choice for bass heads, tube organs, and Hi-Fi amplifiers.

Matched versions of this tube use Apex Matching

Choose burned-in tubes for maximum stability and performance.

RoHS Compliant

### Accessory Items:

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

Apex Matched Pair | T-6550-JJ-MP | 609722127516 | |

Apex Matched Quad | T-6550-JJ-MQ | 609722127523 | |

Apex Burned-In Matched Pair | T-6550-JJ-MPB | 841358101953 | |

Apex Matched Sextet | T-6550-JJ-MS | 609722127530 | |

Apex Burned-In Matched Quad | T-6550-JJ-MQB | 841358101960 | |

Apex Burned-In Matched Sextet | T-6550-JJ-MSB | 841358101977 | |

Single | T-6550-JJ | 609722127509 | 6550 |

Body Height | 110 mm | ||

Cathode Current (I_{k}) | ≤ 175 mA | ||

Filament Current (I_{f}) | 1.6 A | ||

Filament Voltage (U_{f}) | 6.3 V | ||

Grid 1 voltage (U_{g1}) | ≥ -300 V, -14 V typical | ||

Grid 2 current (I_{g2}) | ≤ 12 mA | ||

Grid 2 dissipation (W_{g2}) | 6 W | ||

Grid 2 voltage (U_{g2}) | ≤ 400 V, 250 V typical | ||

Grid capacitance (c_{g1}) | 14 pF | ||

Grid to Plate Capacitance (c_{a/g}) | 0.85 pF | ||

Internal Resistance (R_{i}) | 16 kΩ | ||

Item Diameter | 43 mm | ||

Item Height | 125 mm | ||

Plate Capacitance (c_{a}) | 12 pF | ||

Plate Current (I_{a}) | 140 mA | ||

Plate Dissipation (W_{a}) | ≤ 35 W | ||

Plate Voltage (U_{a}) | ≤ 600 V, 250 V typical | ||

Transconductance (S) | 11.8 mA/V |

Packaging Dimensions | Apex Burned-In Matched Pair version | T-6550-JJ-MPB | 5 in. × 3.8 in. × 1.9 in. |

Apex Burned-In Matched Quad version | T-6550-JJ-MQB | 5 in. × 3.8 in. × 3.8 in. | |

Apex Burned-In Matched Sextet version | T-6550-JJ-MSB | 5.6 in. × 5 in. × 3.8 in. | |

Apex Matched Pair version | T-6550-JJ-MP | 5 in. × 3.8 in. × 1.9 in. | |

Apex Matched Quad version | T-6550-JJ-MQ | 5 in. × 3.8 in. × 3.8 in. | |

Apex Matched Sextet version | T-6550-JJ-MS | 5.6 in. × 5 in. × 3.8 in. | |

Single version | T-6550-JJ | 1.9 in. × 1.9 in. × 5 in. | |

Weight (Packaging) | Apex Burned-In Matched Pair version | T-6550-JJ-MPB | 0.3836 lbs. |

Apex Burned-In Matched Quad version | T-6550-JJ-MQB | 0.7672 lbs. | |

Apex Burned-In Matched Sextet version | T-6550-JJ-MSB | 1.1508 lbs. | |

Apex Matched Pair version | T-6550-JJ-MP | 0.3836 lbs. | |

Apex Matched Quad version | T-6550-JJ-MQ | 0.7672 lbs. | |

Apex Matched Sextet version | T-6550-JJ-MS | 1.1508 lbs. | |

Single version | T-6550-JJ | 0.1918 lbs. |

T-6550-JJ-MP - Apex Matched Pair version | Body Height | 110 mm |

Cathode Current (I_{k}) | ≤ 175 mA | |

Filament Current (I_{f}) | 1.6 A | |

Filament Voltage (U_{f}) | 6.3 V | |

Grid 1 voltage (U_{g1}) | ≥ -300 V, -14 V typical | |

Grid 2 current (I_{g2}) | ≤ 12 mA | |

Grid 2 dissipation (W_{g2}) | 6 W | |

Grid 2 voltage (U_{g2}) | ≤ 400 V, 250 V typical | |

Grid capacitance (c_{g1}) | 14 pF | |

Grid to Plate Capacitance (c_{a/g}) | 0.85 pF | |

Internal Resistance (R_{i}) | 16 kΩ | |

Item Diameter | 43 mm | |

Item Height | 125 mm | |

Plate Capacitance (c_{a}) | 12 pF | |

Plate Current (I_{a}) | 140 mA | |

Plate Dissipation (W_{a}) | ≤ 35 W | |

Plate Voltage (U_{a}) | ≤ 600 V, 250 V typical | |

Transconductance (S) | 11.8 mA/V | |

T-6550-JJ-MQ - Apex Matched Quad version | Body Height | 110 mm |

Cathode Current (I_{k}) | ≤ 175 mA | |

Filament Current (I_{f}) | 1.6 A | |

Filament Voltage (U_{f}) | 6.3 V | |

Grid 1 voltage (U_{g1}) | ≥ -300 V, -14 V typical | |

Grid 2 current (I_{g2}) | ≤ 12 mA | |

Grid 2 dissipation (W_{g2}) | 6 W | |

Grid 2 voltage (U_{g2}) | ≤ 400 V, 250 V typical | |

Grid capacitance (c_{g1}) | 14 pF | |

Grid to Plate Capacitance (c_{a/g}) | 0.85 pF | |

Internal Resistance (R_{i}) | 16 kΩ | |

Item Diameter | 43 mm | |

Item Height | 125 mm | |

Plate Capacitance (c_{a}) | 12 pF | |

Plate Current (I_{a}) | 140 mA | |

Plate Dissipation (W_{a}) | ≤ 35 W | |

Plate Voltage (U_{a}) | ≤ 600 V, 250 V typical | |

Transconductance (S) | 11.8 mA/V | |

T-6550-JJ-MS - Apex Matched Sextet version | Body Height | 110 mm |

Cathode Current (I_{k}) | ≤ 175 mA | |

Filament Current (I_{f}) | 1.6 A | |

Filament Voltage (U_{f}) | 6.3 V | |

Grid 1 voltage (U_{g1}) | ≥ -300 V, -14 V typical | |

Grid 2 current (I_{g2}) | ≤ 12 mA | |

Grid 2 dissipation (W_{g2}) | 6 W | |

Grid 2 voltage (U_{g2}) | ≤ 400 V, 250 V typical | |

Grid capacitance (c_{g1}) | 14 pF | |

Grid to Plate Capacitance (c_{a/g}) | 0.85 pF | |

Internal Resistance (R_{i}) | 16 kΩ | |

Item Diameter | 43 mm | |

Item Height | 125 mm | |

Plate Capacitance (c_{a}) | 12 pF | |

Plate Current (I_{a}) | 140 mA | |

Plate Dissipation (W_{a}) | ≤ 35 W | |

Plate Voltage (U_{a}) | ≤ 600 V, 250 V typical | |

Transconductance (S) | 11.8 mA/V | |

T-6550-JJ-MPB - Apex Burned-In Matched Pair version | Body Height | 110 mm |

Cathode Current (I_{k}) | ≤ 175 mA | |

Filament Current (I_{f}) | 1.6 A | |

Filament Voltage (U_{f}) | 6.3 V | |

Grid 1 voltage (U_{g1}) | ≥ -300 V, -14 V typical | |

Grid 2 current (I_{g2}) | ≤ 12 mA | |

Grid 2 dissipation (W_{g2}) | 6 W | |

Grid 2 voltage (U_{g2}) | ≤ 400 V, 250 V typical | |

Grid capacitance (c_{g1}) | 14 pF | |

Grid to Plate Capacitance (c_{a/g}) | 0.85 pF | |

Internal Resistance (R_{i}) | 16 kΩ | |

Item Diameter | 43 mm | |

Item Height | 125 mm | |

Plate Capacitance (c_{a}) | 12 pF | |

Plate Current (I_{a}) | 140 mA | |

Plate Dissipation (W_{a}) | ≤ 35 W | |

Plate Voltage (U_{a}) | ≤ 600 V, 250 V typical | |

Transconductance (S) | 11.8 mA/V | |

T-6550-JJ-MQB - Apex Burned-In Matched Quad version | Body Height | 110 mm |

Cathode Current (I_{k}) | ≤ 175 mA | |

Filament Current (I_{f}) | 1.6 A | |

Filament Voltage (U_{f}) | 6.3 V | |

Grid 1 voltage (U_{g1}) | ≥ -300 V, -14 V typical | |

Grid 2 current (I_{g2}) | ≤ 12 mA | |

Grid 2 dissipation (W_{g2}) | 6 W | |

Grid 2 voltage (U_{g2}) | ≤ 400 V, 250 V typical | |

Grid capacitance (c_{g1}) | 14 pF | |

Grid to Plate Capacitance (c_{a/g}) | 0.85 pF | |

Internal Resistance (R_{i}) | 16 kΩ | |

Item Diameter | 43 mm | |

Item Height | 125 mm | |

Plate Capacitance (c_{a}) | 12 pF | |

Plate Current (I_{a}) | 140 mA | |

Plate Dissipation (W_{a}) | ≤ 35 W | |

Plate Voltage (U_{a}) | ≤ 600 V, 250 V typical | |

Transconductance (S) | 11.8 mA/V | |

T-6550-JJ-MSB - Apex Burned-In Matched Sextet version | Body Height | 110 mm |

Cathode Current (I_{k}) | ≤ 175 mA | |

Filament Current (I_{f}) | 1.6 A | |

Filament Voltage (U_{f}) | 6.3 V | |

Grid 1 voltage (U_{g1}) | ≥ -300 V, -14 V typical | |

Grid 2 current (I_{g2}) | ≤ 12 mA | |

Grid 2 dissipation (W_{g2}) | 6 W | |

Grid 2 voltage (U_{g2}) | ≤ 400 V, 250 V typical | |

Grid capacitance (c_{g1}) | 14 pF | |

Grid to Plate Capacitance (c_{a/g}) | 0.85 pF | |

Internal Resistance (R_{i}) | 16 kΩ | |

Item Diameter | 43 mm | |

Item Height | 125 mm | |

Plate Capacitance (c_{a}) | 12 pF | |

Plate Current (I_{a}) | 140 mA | |

Plate Dissipation (W_{a}) | ≤ 35 W | |

Plate Voltage (U_{a}) | ≤ 600 V, 250 V typical | |

Transconductance (S) | 11.8 mA/V | |

T-6550-JJ - Single version | Body Height | 110 mm |

Cathode Current (I_{k}) | ≤ 175 mA | |

Filament Current (I_{f}) | 1.6 A | |

Filament Voltage (U_{f}) | 6.3 V | |

Grid 1 voltage (U_{g1}) | ≥ -300 V, -14 V typical | |

Grid 2 current (I_{g2}) | ≤ 12 mA | |

Grid 2 dissipation (W_{g2}) | 6 W | |

Grid 2 voltage (U_{g2}) | ≤ 400 V, 250 V typical | |

Grid capacitance (c_{g1}) | 14 pF | |

Grid to Plate Capacitance (c_{a/g}) | 0.85 pF | |

Internal Resistance (R_{i}) | 16 kΩ | |

Item Diameter | 43 mm | |

Item Height | 125 mm | |

Plate Capacitance (c_{a}) | 12 pF | |

Plate Current (I_{a}) | 140 mA | |

Plate Dissipation (W_{a}) | ≤ 35 W | |

Plate Voltage (U_{a}) | ≤ 600 V, 250 V typical | |

Transconductance (S) | 11.8 mA/V |

Specification Sheet | All Models |

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## Specifications, Files, and Documents

Questions? Contact us at [email protected], or give us a call at 480-296-0890

## 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

These 6550's sound just like the old ones they replaced. Excellent! I haven't tried any other version/brand as I am happy with the JJ's. Plug and play Apex matched pair into my cathode biased Marshall SC800H(with Lynch Module)sitting on my Fender Bassbreaker 212 cab loaded with a Redback/V30 mix. No pedals. Proper Marshall bark and kerrang. Will not be going back to EL34's or 6CA7's in this amp.