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KT88 - JJ Electronics

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Item ID: 004876
Starting at: $38.50
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KT88 is a beam output pentode with an octal base and power of 42W. Very powerful, with strong bass and very bright highs. It can also be used in 6550 amplifiers.

Apex Tube Matching
Matched versions of this tube use Apex Matching
OptionOur 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

4.75 out of 5 based on 4 reviews

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)

rshwayder - April 2nd, 2016

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.

tubosaurus - January 17th, 2016

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...

Oh - January 8th, 2015

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.

Bryan Morris - October 7th, 2014

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