Vacuum Tube - KT88, JJ Electronics

JJ Electronics
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Vacuum Tube - KT88, JJ Electronics

Starting at: $59.95
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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.

Apex Tube Matching
Matched versions of this tube use Apex Matching
SKU:
T-KT88-JJ
Item ID:
004876
Brand:
JJ Electronics, Apex Matched
Type:
RoHS Compliant
Part Numbers
Single or MatchedOur Part NumberUPC/EANJJ Electronics Part Number
Apex Matched PairT-KT88-JJ-MP609722123235
Apex Matched QuadT-KT88-JJ-MQ609722123242
Apex Matched SextetT-KT88-JJ-MS609722123259
SingleT-KT88-JJ609722123228 KT88
Body Height110 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 Diameter52 mm
Item Height125 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 Information
Packaging DimensionsApex Matched Pair versionT-KT88-JJ-MP5.3 in. × 4.5 in. × 2.3 in.
Apex Matched Quad versionT-KT88-JJ-MQ5.3 in. × 4.5 in. × 4.5 in.
Apex Matched Sextet versionT-KT88-JJ-MS6.8 in. × 5.3 in. × 4.5 in.
Single versionT-KT88-JJ2.3 in. × 2.3 in. × 5.1 in.
Weight (Packaging)Apex Matched Pair versionT-KT88-JJ-MP0.5512 lbs.
Apex Matched Quad versionT-KT88-JJ-MQ1.1024 lbs.
Apex Matched Sextet versionT-KT88-JJ-MS1.6536 lbs.
Single versionT-KT88-JJ0.2756 lbs.
T-KT88-JJ-MP - Apex Matched Pair versionBody Height110 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 Diameter52 mm
Item Height125 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 versionBody Height110 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 Diameter52 mm
Item Height125 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 versionBody Height110 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 Diameter52 mm
Item Height125 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 versionBody Height110 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 Diameter52 mm
Item Height125 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

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet504.71 KB
Questions? Contact us at [email protected], or give us a call at 480-296-0890

Product Reviews

4.80 out of 5 based on 5 reviews
Pissed Plexi - January 23rd, 2024
5 out of 5

So these JJ KT88's and JJ 6550's are my favorite power tubes in my Marshallz. The KT88's bottom end is more pronounced and rounder. I'd say even solo notes are rounder. Clear, articulate, and bouncy. Im happy with either 6550's or these. Glad I spent the money to find out. Had a few guitarists recommend the KT88's since i could use them in my amps. They were right.

Frank Pocino - October 18th, 2022
4 out of 5

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.

Anonymous - July 20th, 2022
5 out of 5

Depending on the amp, this tube can be noisy or whisper quiet

Marvin - May 3rd, 2021
5 out of 5

Amazing tubes. They work perfectly and we're packaged well. I'm sure I'll get years out of these.

Weber - March 13th, 2021
5 out of 5

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.

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.