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Vacuum Tube - KT88, JJ Electronics
Starting at: $56.95
Product Options
- Apex Matched Quad (T-KT88-JJ-MQ)
This product has substitutes available! Check them out.
The JJ Electronic KT88 is a sonically faithful reproduction of the original tubes with a robust construction encased in a thick glass envelope. The JJ KT88 delivers a powerful 42 Watts with plenty of headroom to spare. This tube has a tone that is warm and lively with a detailed and balance response. The JJ KT88 is an excellent choice for Hi-Fi stereo equipment as well as guitar amplifiers. It can be used in place of 6550 tubes.
Matched versions of this tube use Apex Matching
RoHS Compliant
Accessory Items:
| Single or Matched | Our Part Number | UPC/EAN | JJ Electronics Part Number |
|---|---|---|---|
| Apex Matched Pair | T-KT88-JJ-MP | 609722123235 | |
| Apex Matched Quad | T-KT88-JJ-MQ | 609722123242 | |
| Apex Matched Sextet | T-KT88-JJ-MS | 609722123259 | |
| Single | T-KT88-JJ | 609722123228 | KT88 |
| Body Height | 110 mm | |
| Cathode Current (Ik) | ≤ 230 mA | |
| Filament Current (If) | 1.6 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μ) | 8 | |
| Grid 1 voltage (Ug1) | -15 V typical | |
| Grid 2 current (Ig2) | ≤ 7 mA | |
| Grid 2 dissipation (Wg2) | 8 W | |
| Grid 2 voltage (Ug2) | ≤ 600 V, 250 V typical | |
| Grid capacitance (cg1) | 16.5 pF | |
| Grid to Plate Capacitance (ca/g) | 2.3 pF | |
| Internal Resistance (Ri) | 12 kΩ | |
| Item Diameter | 52 mm | |
| Item Height | 125 mm | |
| Plate Capacitance (ca) | 10 pF | |
| Plate Current (Ia) | 140 mA | |
| Plate Dissipation (Wa) | ≤ 42 W | |
| Plate Voltage (Ua) | ≤ 800 V, 250 V typical | |
| Transconductance (S) | 11.5 mA/V |
| Packaging Dimensions | Apex Matched Pair version | T-KT88-JJ-MP | 5.3 in. × 4.5 in. × 2.3 in. |
| Apex Matched Quad version | T-KT88-JJ-MQ | 5.3 in. × 4.5 in. × 4.5 in. | |
| Apex Matched Sextet version | T-KT88-JJ-MS | 6.8 in. × 5.3 in. × 4.5 in. | |
| Single version | T-KT88-JJ | 2.3 in. × 2.3 in. × 5.1 in. | |
| Weight (Packaging) | Apex Matched Pair version | T-KT88-JJ-MP | 0.54 lbs. |
| Apex Matched Quad version | T-KT88-JJ-MQ | 1.08 lbs. | |
| Apex Matched Sextet version | T-KT88-JJ-MS | 1.62 lbs. | |
| Single version | T-KT88-JJ | 0.27 lbs. |
| T-KT88-JJ-MP - Apex Matched Pair version | Body Height | 110 mm |
| Cathode Current (Ik) | ≤ 230 mA | |
| Filament Current (If) | 1.6 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μ) | 8 | |
| Grid 1 voltage (Ug1) | -15 V typical | |
| Grid 2 current (Ig2) | ≤ 7 mA | |
| Grid 2 dissipation (Wg2) | 8 W | |
| Grid 2 voltage (Ug2) | ≤ 600 V, 250 V typical | |
| Grid capacitance (cg1) | 16.5 pF | |
| Grid to Plate Capacitance (ca/g) | 2.3 pF | |
| Internal Resistance (Ri) | 12 kΩ | |
| Item Diameter | 52 mm | |
| Item Height | 125 mm | |
| Plate Capacitance (ca) | 10 pF | |
| Plate Current (Ia) | 140 mA | |
| Plate Dissipation (Wa) | ≤ 42 W | |
| Plate Voltage (Ua) | ≤ 800 V, 250 V typical | |
| Transconductance (S) | 11.5 mA/V | |
| T-KT88-JJ-MQ - Apex Matched Quad version | Body Height | 110 mm |
| Cathode Current (Ik) | ≤ 230 mA | |
| Filament Current (If) | 1.6 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μ) | 8 | |
| Grid 1 voltage (Ug1) | -15 V typical | |
| Grid 2 current (Ig2) | ≤ 7 mA | |
| Grid 2 dissipation (Wg2) | 8 W | |
| Grid 2 voltage (Ug2) | ≤ 600 V, 250 V typical | |
| Grid capacitance (cg1) | 16.5 pF | |
| Grid to Plate Capacitance (ca/g) | 2.3 pF | |
| Internal Resistance (Ri) | 12 kΩ | |
| Item Diameter | 52 mm | |
| Item Height | 125 mm | |
| Plate Capacitance (ca) | 10 pF | |
| Plate Current (Ia) | 140 mA | |
| Plate Dissipation (Wa) | ≤ 42 W | |
| Plate Voltage (Ua) | ≤ 800 V, 250 V typical | |
| Transconductance (S) | 11.5 mA/V | |
| T-KT88-JJ-MS - Apex Matched Sextet version | Body Height | 110 mm |
| Cathode Current (Ik) | ≤ 230 mA | |
| Filament Current (If) | 1.6 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μ) | 8 | |
| Grid 1 voltage (Ug1) | -15 V typical | |
| Grid 2 current (Ig2) | ≤ 7 mA | |
| Grid 2 dissipation (Wg2) | 8 W | |
| Grid 2 voltage (Ug2) | ≤ 600 V, 250 V typical | |
| Grid capacitance (cg1) | 16.5 pF | |
| Grid to Plate Capacitance (ca/g) | 2.3 pF | |
| Internal Resistance (Ri) | 12 kΩ | |
| Item Diameter | 52 mm | |
| Item Height | 125 mm | |
| Plate Capacitance (ca) | 10 pF | |
| Plate Current (Ia) | 140 mA | |
| Plate Dissipation (Wa) | ≤ 42 W | |
| Plate Voltage (Ua) | ≤ 800 V, 250 V typical | |
| Transconductance (S) | 11.5 mA/V | |
| T-KT88-JJ - Single version | Body Height | 110 mm |
| Cathode Current (Ik) | ≤ 230 mA | |
| Filament Current (If) | 1.6 A | |
| Filament Voltage (Uf) | 6.3 V | |
| Gain (μ) | 8 | |
| Grid 1 voltage (Ug1) | -15 V typical | |
| Grid 2 current (Ig2) | ≤ 7 mA | |
| Grid 2 dissipation (Wg2) | 8 W | |
| Grid 2 voltage (Ug2) | ≤ 600 V, 250 V typical | |
| Grid capacitance (cg1) | 16.5 pF | |
| Grid to Plate Capacitance (ca/g) | 2.3 pF | |
| Internal Resistance (Ri) | 12 kΩ | |
| Item Diameter | 52 mm | |
| Item Height | 125 mm | |
| Plate Capacitance (ca) | 10 pF | |
| Plate Current (Ia) | 140 mA | |
| Plate Dissipation (Wa) | ≤ 42 W | |
| Plate Voltage (Ua) | ≤ 800 V, 250 V typical | |
| Transconductance (S) | 11.5 mA/V |
 Specification Sheet | All Models |
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Specifications, Files, and Documents
Questions and Answers
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1 answers
el34 is too treble oriented in my bivalve 30 thd/orange cab set up. I want to get more balanced. needs more low end. I was thinking kt77 or kt88. Your opinions and suggestions are needed as I am new at this. I always bought combos now I am trying to shape my sound.
Asked by Anonymous on May 26th, 2017.
The KT 77 and 88 will give you more lows but not necessarily less highs. Our experience has been that swapping preamp tubes has more of an effect on the high end than the power tubes. Also, if you have an older bivalve the KT88's will be to big for the top to fit.
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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Product Reviews
This is the first time I have used KT88 vacuum tubes for my vintage Harmon Kardon Citation II audio amplifier. One of the four power tubes proved to be intermittently defective but Amplified replaced it. Nice clean sound, and virtually no hum.
Depending on the amp, this tube can be noisy or whisper quiet
Amazing tubes. They work perfectly and we're packaged well. I'm sure I'll get years out of these.
I bought a quad of these JJ kt88's. Along with a pair of Bugle Boy 12at7 and RCA 12ax7 long black plates installed them in a Jolida 502 amp. I was sure surprised by how nice they are over the Gold Lion kt88 quad I had in it. They are built much better also.