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Vacuum Tube - KT88, JJ Electronics

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Customer image:<br/>"My Dynakit Mark III getting new J/J KT88s and a general check over."
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Customer Images:
Customer image: "My Dynakit Mark III getting new J/J KT88s and a general check over."
Item ID: 004876
Starting at: $39.95
In Stock
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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
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

RoHS Compliant

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Specifications, Files, and Documents

Product Reviews

4.89 out of 5 based on 9 reviews
5 out of 5

I've been using J/J tubes since they first became available. I use them in my own gear and the gear I service. Only 2 tubes had to be replaced in all that time. They work well and can take the abuse of guitar amplifiers on the road.

- May 15th, 2020
5 out of 5

Quick delivery and great tubes.
Thank you.

- December 29th, 2019
5 out of 5

These are great tubes for my Leslie 122. Great sound, nice drive. Works as a modern replacement for these amps.

- May 3rd, 2019
5 out of 5

I have heard about the kt88,but I never tried them. So I brought these tubes and man I never go back to the 6550 power amp tubes.gives you all the lows you need. I use them in my 122 Leslie speaker,

- January 19th, 2019
5 out of 5

Lovely tubes. Solid construction. Typical KT88 sound, as it should be.

- July 10th, 2018
5 out of 5

I've tried more than a dozen power tubes in my Amps &* Sound Mogwai headphone/speaker amplifier. I checked out a variety of KT88, 6L6, 6CA7, 6550, 5881, and similar tubes.

The JJ KT88 are excellent tubes. They have great bass, smooth treble, and very nice full mids.

Unlike most KT88 tubes, they have virtually no microphonics at all.

The sound, availability, price, ability to get Apex-matched tubes, and robust build quality pushed me to make this my house tube.

Other tubes I put them up against:

Mullard KT88 (New and NOS)
Svetlana 6550 Winged C (New and NOS)
6P3S (NOS)
Svetlana 6550 (New)
Preferred Series KT88 (New)
JJ 6CA7 (New)
Sovtek 5881WGC (New)
5881 Tung-Sol (New)
Tung-Sol 6L6GC-STR (New)
Electro-Harmonix KT88 (New)
Electro-Harmonix EL34 (New)
Electro-Harmonix 6550 (New)

- April 2nd, 2016
5 out of 5

As far as I can tell, these tubes are visually and sonically identical to the OEM branded KT88s that came in my McIntosh MC275mkVI. I tried to replace them with the Russian Gold Lion reissues and much prefer the JJs in this amp. The Gold Lions were crispier and tighter, but thinner sounding and too aggressive in the high mids and low treble. The JJs are easier on the ears. The bass is especially nice.

- January 17th, 2016
5 out of 5

These tube, related to the build, are massive, strong,heavy.
On My Chinese amp (Yaqin MS110 b) sounds a bit less "tube" than the Chinese one, more "KSSSSS".
After adjusting the bias, at 0.5 V, that was the bias of shuguang tubes, these ones let the amp drastically less hot...
Before, with shuguang tubes my amps was difficult to touch after an hour, now with these tubes, after two hours, transformers are just more than tempered...

- January 8th, 2015
4 out of 5

I have these fitted in a 77 marshall, have used many varieties. Prefer these to KT90, EL34. Open, lots of headroom, smooth. 34's much cheaper, if I gigged more with this amp I might opt for cheaper tubes.

- October 7th, 2014

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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.