Vacuum Tube - KT66, JJ Electronics

Vacuum Tube - KT66, JJ Electronics

JJ Electronics
Vacuum Tube - KT66, JJ Electronics image 1
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Starting at: $39.95
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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.

Apex Tube Matching
Matched versions of this tube use Apex Matching
RoHS Compliant
SKU:
T-KT66-JJ
Item ID:
004871
Brand:
JJ Electronics, Apex Matched
Type:
Part Numbers
Single or MatchedOur Part NumberUPC/EANJJ Electronics Part Number
Apex Matched PairT-KT66-JJ-MP609722123136
Apex Matched QuadT-KT66-JJ-MQ609722123143
SingleT-KT66-JJ609722123129 KT66
Product Measurements by Type
Body Height110 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 Diameter52 mm
Item Height125 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 Information
Packaging DimensionsApex Matched Pair versionT-KT66-JJ-MP5.3 in. × 4.5 in. × 2.3 in.
Apex Matched Quad versionT-KT66-JJ-MQ5.3 in. × 4.5 in. × 4.5 in.
Single versionT-KT66-JJ2.3 in. × 2.3 in. × 5.3 in.
Weight (Packaging)Apex Matched Pair versionT-KT66-JJ-MP0.512 lbs.
Apex Matched Quad versionT-KT66-JJ-MQ1.024 lbs.
Single versionT-KT66-JJ0.256 lbs.
Product Measurements by Item
T-KT66-JJ-MP - Apex Matched Pair versionBody Height110 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 Diameter52 mm
Item Height125 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
T-KT66-JJ-MQ - Apex Matched Quad versionBody Height110 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 Diameter52 mm
Item Height125 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
T-KT66-JJ - Single versionBody Height110 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 Diameter52 mm
Item Height125 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

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet569.46 KB

Questions and Answers

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Product Reviews

3.50 out of 5 based on 2 reviews
- March 27th, 2015
3 out of 5

Bright, aggressive and probably the farthest from sounding like a genuine MOV-GEC valve. These can also draw way too much plate current, and will drift way off in a short period of time. This is about my last personal choice of a KT66. These also lacked the headroom of a MOV KT66. In my Conrad Johnson, these were horrible. They were okay, in a Kitchen 75 watt guitar amp, but I swapped these for Chinese valves.

- October 4th, 2014
4 out of 5

Take my review with a grain of salt as I'm a brand new KT66 user. And if you read enough around the interwebs, you'll learn that there are "real" KT66s (Genelex? Shaguang?). And there are "fake" ones - not true to the original design. And my point is, I don't know that I care. These JJ KT66s sound fantastic in my Fargen Miniplex MK2! I had a duo of Winged C EL34s in it and there was nothing wrong with that, very aggressive. But at Fargen's recommendation, I'm running one EL34 and one KT66 right now. Great growl and articulation as you continue to crank it. The JJs also seem very solid in terms of build. Heavy, pretty, built for business. I'd give 5 stars, but I just haven't tried enough 66s to know if they're that good. (I should note that I'm a pretty big fan of all JJ power tubes, but not their preamp tubes. They just seem to get the bigger bottles right to me).

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.