Vacuum Tube - KT88, JJ Electronics, Blue Glass

Vacuum Tube - KT88, JJ Electronics, Blue Glass

JJ Electronics
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Starting at: $44.95
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Blue glass envelope.

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-BL-JJ
Item ID:
004880
Brand:
JJ Electronics, Apex Matched
Type:
RoHS Compliant
Part Numbers
Single or MatchedOur Part NumberUPC/EANJJ Electronics Part Number
Apex Matched PairT-KT88-BL-JJ-MP609722123198
Apex Matched QuadT-KT88-BL-JJ-MQ609722123204
Apex Matched SextetT-KT88-BL-JJ-MS609722123211
SingleT-KT88-BLUE-JJ609722123181 KT88 Blue
Product Measurements by Type
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-BL-JJ-MP5.3 in. × 4.5 in. × 2.3 in.
Apex Matched Quad versionT-KT88-BL-JJ-MQ5.3 in. × 4.5 in. × 4.5 in.
Apex Matched Sextet versionT-KT88-BL-JJ-MS6.8 in. × 5.3 in. × 4.5 in.
Single versionT-KT88-BLUE-JJ2.1 in. × 2.3 in. × 5.4 in.
Weight (Packaging)Apex Matched Pair versionT-KT88-BL-JJ-MP0.54 lbs.
Apex Matched Quad versionT-KT88-BL-JJ-MQ1.08 lbs.
Apex Matched Sextet versionT-KT88-BL-JJ-MS1.62 lbs.
Single versionT-KT88-BLUE-JJ0.27 lbs.
Product Measurements by Item
T-KT88-BLUE-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
T-KT88-BL-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-BL-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-BL-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

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet504.71 KB

Questions and Answers

Click each question to see its answers.
Asked by Anonymous on September 14th, 2015.
JustinG
September 14th, 2015
Staff Member
Top Contributor
These tubes are produced in the Slovak Republic.

Product Reviews

5.00 out of 5 based on 3 reviews
- September 10th, 2021
5 out of 5

I'm glad I bought the Apex Quad Matched JJ KT88 Blue Glass set. I've been using the original Shuguang KT88 tubes that came with my 13 yr old Yaqin MC100B. They have been sounding lethargic the last few years and I've listened to the MC100B less and less. But my wife recently showed interest in vinyls and started buying albums. She also urged me to upgrade to a better turntable. We chose the Rega Planar 2. I finally decided to replace the old Shuguangs. When I first bought the MC100B, I had immediately replaced the original Chinese 12AX7 and 6N8P with JJ 12AX7 and Sylvania 6SN7GTA. The Shuguangs sounded good with the JJ and Sylvania in front. But that was then. With the new Rega turntable, the Shuguangs were too bassy and lacking verve. That all changed for the *best* with the new matched JJ KT88 quad. And that blue glass, they simply make the MC100B that much more eye catching and so cool. Thanks to AES for a great price and quick shipping.

- May 10th, 2016
5 out of 5

Great product! Fast delivery.

- June 6th, 2015
5 out of 5

Excellent product with special blue glass which I have collected from the pre WW2 tube manufacturers. I am building a power amplifier using all blue glass tubes as a novelty piece for use in my stereo system center channel source. It will be visually displayed in the system.

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.