Vacuum Tube - KT88, JJ Electronics

JJ Electronics
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Vacuum Tube - KT88, JJ Electronics

Starting at: $39.95
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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
RoHS Compliant
Item ID:
JJ Electronics, Apex Matched
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Apex Matched PairT-KT88-JJ-MP609722123235
Apex Matched QuadT-KT88-JJ-MQ609722123242
Apex Matched SextetT-KT88-JJ-MS609722123259
Product Measurements
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 version5.3 in. × 4.5 in. × 2.3 in.
Apex Matched Quad version5.3 in. × 4.5 in. × 4.5 in.
Apex Matched Sextet version6.8 in. × 5.3 in. × 4.5 in.
Single version2.3 in. × 2.3 in. × 5.1 in.
Weight (Packaging)Apex Matched Pair version0.54 lbs.
Apex Matched Quad version1.08 lbs.
Apex Matched Sextet version1.62 lbs.
Single version0.27 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet504.71 KB

Questions and Answers

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Asked by Anonymous on May 26th, 2017.
Matt H
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.

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