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Vacuum Tube - KT66, JJ Electronics
The JJ Electronic KT66 is a sonically faithful reproduction of the original tubes with a robust construction encased in a thick glass envelope. The JJ KT66 delivers a powerful 25 Watts with plenty of headroom. This tube has a tone that is warm, thick, and straightforward. With a more balanced sound than the 6L6GC, the JJ KT66 is an excellent choice for a full bodied tone.
Matched versions of this tube use Apex Matching
RoHS Compliant
| Single or Matched | Our Part Number | UPC/EAN |
|---|---|---|
| Apex Matched Pair | T-KT66-JJ-MP | 609722123136 |
| Apex Matched Quad | T-KT66-JJ-MQ | 609722123143 |
| Single | T-KT66-JJ | 609722123129 |
| Body Height | 110 mm | |
| Cathode Current (Ik) | ≤ 150 mA | |
| Filament Current (If) | 1.3 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Grid 1 voltage (Ug1) | ≥ -200 V, -15 V typical | |
| Grid 2 current (Ig2) | ≤ 7 mA | |
| Grid 2 dissipation (Wg2) | 3.5 W | |
| Grid 2 voltage (Ug2) | ≤ 550 V, 250 V typical | |
| Grid capacitance (cg1) | 16 pF | |
| Grid to Plate Capacitance (ca/g) | 2.3 pF | |
| Internal Resistance (Ri) | 22.5 kΩ | |
| Item Diameter | 52 mm | |
| Item Height | 125 mm | |
| Plate Capacitance (ca) | 10 pF | |
| Plate Current (Ia) | 85 mA | |
| Plate Dissipation (Wa) | ≤ 25 W | |
| Plate Voltage (Ua) | ≤ 550 V, 250 V typical | |
| Transconductance (S) | 6 mA/V |
| Packaging Dimensions | Apex Matched Pair version | 5.3 in. × 4.5 in. × 2.3 in. |
| Apex Matched Quad version | 5.3 in. × 4.5 in. × 4.5 in. | |
| Single version | 2.3 in. × 2.3 in. × 5.3 in. | |
| Weight (Packaging) | Apex Matched Pair version | 0.512 lbs. |
| Apex Matched Quad version | 1.024 lbs. | |
| Single version | 0.256 lbs. |
 Specification Sheet | All Models |
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Questions and Answers
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1 answers
Under tech corner 6L6GC Comparison of Current Made Tubes it lists this tube as 2.5" but the manufacturer data sheet has it at 52mm or about 2.0". Is this 2" or 2.5" in diameter?
Asked by Gorgut on January 6th, 2019.
January 9th, 2019
Staff Member
The example I measured had a diameter of 2.06" so the data sheet is accurate. I will have that information updated.
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.
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