Vacuum Tube - KT77, JJ Electronics
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Starting at: $21.95
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The JJ Electronic KT77 is a reproduction of the original tubes that captures the sound that made the KT77 famous. In their typical fashion, JJ has built this tube in a solid construction that is robust and highly reliable. This tube has more headroom than a typical EL34. The low end is fat and defines with detailed and responsive mids and smooth highs. This is an excellent tube for adding more power to the sound of an EL34 amp.
Matched versions of this tube use Apex Matching
RoHS Compliant
| Single or Matched | Our Part Number | UPC/EAN | JJ Electronics Part Number |
|---|---|---|---|
| Apex Matched Pair | T-KT77-JJ-MP | 609722123167 | |
| Apex Matched Quad | T-KT77-JJ-MQ | 609722123174 | |
| Single | T-KT77-JJ | 609722123150 | KT77 |
| Body Height | 98 mm | |
| Cathode Current (Ik) | ≤ 180 mA | |
| Filament Current (If) | 1.4 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μ) | 11.5 | |
| Grid 1 voltage (Ug1) | -13.5 V typical | |
| Grid 2 current (Ig2) | ≤ 10 mA | |
| Grid 2 dissipation (Wg2) | 6 W | |
| Grid 2 voltage (Ug2) | ≤ 600 V, 250 V typical | |
| Grid capacitance (cg1) | 16.5 pF | |
| Grid to Plate Capacitance (ca/g) | 1 pF | |
| Internal Resistance (Ri) | 23 kΩ | |
| Item Diameter | 33.3 mm | |
| Item Height | 112 mm | |
| Plate Capacitance (ca) | 9 pF | |
| Plate Current (Ia) | 100 mA | |
| Plate Dissipation (Wa) | ≤ 25 W | |
| Plate Voltage (Ua) | ≤ 800 V, 250 V typical | |
| Transconductance (S) | 10.5 mA/V |
| Packaging Dimensions | Apex Matched Pair version | T-KT77-JJ-MP | 4.8 in. × 3.3 in. × 1.6 in. |
| Apex Matched Quad version | T-KT77-JJ-MQ | 4.8 in. × 3.3 in. × 3.3 in. | |
| Single version | T-KT77-JJ | 1.6 in. × 1.6 in. × 4.6 in. | |
| Weight (Packaging) | Apex Matched Pair version | T-KT77-JJ-MP | 0.268 lbs. |
| Apex Matched Quad version | T-KT77-JJ-MQ | 0.536 lbs. | |
| Single version | T-KT77-JJ | 0.134 lbs. |
| T-KT77-JJ-MP - Apex Matched Pair version | Body Height | 98 mm |
| Cathode Current (Ik) | ≤ 180 mA | |
| Filament Current (If) | 1.4 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μ) | 11.5 | |
| Grid 1 voltage (Ug1) | -13.5 V typical | |
| Grid 2 current (Ig2) | ≤ 10 mA | |
| Grid 2 dissipation (Wg2) | 6 W | |
| Grid 2 voltage (Ug2) | ≤ 600 V, 250 V typical | |
| Grid capacitance (cg1) | 16.5 pF | |
| Grid to Plate Capacitance (ca/g) | 1 pF | |
| Internal Resistance (Ri) | 23 kΩ | |
| Item Diameter | 33.3 mm | |
| Item Height | 112 mm | |
| Plate Capacitance (ca) | 9 pF | |
| Plate Current (Ia) | 100 mA | |
| Plate Dissipation (Wa) | ≤ 25 W | |
| Plate Voltage (Ua) | ≤ 800 V, 250 V typical | |
| Transconductance (S) | 10.5 mA/V | |
| T-KT77-JJ-MQ - Apex Matched Quad version | Body Height | 98 mm |
| Cathode Current (Ik) | ≤ 180 mA | |
| Filament Current (If) | 1.4 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μ) | 11.5 | |
| Grid 1 voltage (Ug1) | -13.5 V typical | |
| Grid 2 current (Ig2) | ≤ 10 mA | |
| Grid 2 dissipation (Wg2) | 6 W | |
| Grid 2 voltage (Ug2) | ≤ 600 V, 250 V typical | |
| Grid capacitance (cg1) | 16.5 pF | |
| Grid to Plate Capacitance (ca/g) | 1 pF | |
| Internal Resistance (Ri) | 23 kΩ | |
| Item Diameter | 33.3 mm | |
| Item Height | 112 mm | |
| Plate Capacitance (ca) | 9 pF | |
| Plate Current (Ia) | 100 mA | |
| Plate Dissipation (Wa) | ≤ 25 W | |
| Plate Voltage (Ua) | ≤ 800 V, 250 V typical | |
| Transconductance (S) | 10.5 mA/V | |
| T-KT77-JJ - Single version | Body Height | 98 mm |
| Cathode Current (Ik) | ≤ 180 mA | |
| Filament Current (If) | 1.4 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μ) | 11.5 | |
| Grid 1 voltage (Ug1) | -13.5 V typical | |
| Grid 2 current (Ig2) | ≤ 10 mA | |
| Grid 2 dissipation (Wg2) | 6 W | |
| Grid 2 voltage (Ug2) | ≤ 600 V, 250 V typical | |
| Grid capacitance (cg1) | 16.5 pF | |
| Grid to Plate Capacitance (ca/g) | 1 pF | |
| Internal Resistance (Ri) | 23 kΩ | |
| Item Diameter | 33.3 mm | |
| Item Height | 112 mm | |
| Plate Capacitance (ca) | 9 pF | |
| Plate Current (Ia) | 100 mA | |
| Plate Dissipation (Wa) | ≤ 25 W | |
| Plate Voltage (Ua) | ≤ 800 V, 250 V typical | |
| Transconductance (S) | 10.5 mA/V |
 Specification Sheet | All Models |
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Product Reviews
Excellent sounding tubes. Great bottom end response.
I was a little skeptical about the difference from switching from el34s to kt77 and the tones I would get. After installation I was blown away! It was way beyond my expectations. Very saturated tone with a better low end. I couldn't be happier!
I put these in an Egnater renegade amp instead of the EL34"s and re-biased. Very clean with some upper end "jingle" that I did not have with the other tubes. Slightly more gain than the 6L6's and a little brighter. The tube matching with the new Apex system was dead on. Thanks again!!wb