Preferred Series KT88

21 Reviews

Availability: Usually ships within 24 hours.

USD $‎79.95
Our Preferred Series KT88 tube is a versatile high quality tube. It is very musical and with a frequency range balanced from top to bottom. It has a strong detailed bass and smooth highs, with the mids slightly warm yet still detailed. The soundstage is wide and deep. The Preferred Series KT88 construction features a solid plate design and triple getters.

We have been working at sourcing a good quality KT88 tube for the past couple years. This KT88 has excellent quality and for the price is one of the best KT88 in production today. They are custom made for us in China by the Shuguang factory. Our years of experience in testing, rating and listening, combined with customer feedback and knowledge were used to give you the best tube value we can provide. These are tubes that consistently provide us with positive customer feedback.

This tube is also sold as or known as Penta KT88SC or KT88-SC tube.

The Preferred Series KT88 tubes carry a 6 month extended warranty.

Wholesale pricing: Is available on 25 pairs or more. Contact us for pricing.

Other Preferred Series tubesKT88 Tube Types

Additional Information and Downloads

Tube Matching Information:
Power Tube Matching FAQ
Perfect Pair System

Warranty Information and Return Policy

Warranty Period: 6 months

All our Preferred Series tubes are guaranteed for 6 months from the date of purchase. (Any exceptions will be noted on that tube's Warranty tab)

If you receive a tube that does not perform to the manufacturer's specifications, please do the following:

- contact us to get a return authorization
- return it via regular mail within 6 months from when we shipped it, and we will provide an exchange or refund of the full purchase price of the tube.

Returns not related to warranty or defect will be considered at our discretion, and are subject to a 15% restocking fee.

We can not accept returns that don't have an authorization, are past 6 months, or are returned improperly.

These guidelines may be updated without notice.

Overpriced grabage.Over reviewed.


These tubes are terrible. I cannot believe that these tubes have a 5 star review. They cannot handle lots of information, as soon as the load is on them the dynamics disappear. No life in the sound of these tubes. Don't waste your money. The more power you put to the tubes they start to distort. They cannot handle the power. I wish I could return them. I have 10hrs on them. The Russian Gold Lion tubes Sound amazing after 10-15 hours. That was my second try with the Chinese tubes and the last.

Average sound, but maybe not so reliable


One or more were noisy, which seemed to burn off and then happen only occasionally. At less than 3 months one burned out in rather spectacular fashion. The Tubestore replaced under warranty. Then another burned out same way. So 2 tubes out of 5 in less than 6 months.

Compared to some old spares on hand, the Svetlana have less glare, and JJ have a noticeably greater sense of ease, almost silky refined midrange and treble, and quite a bit deeper and more palpably real sound stage. Quite a surprise considering how old they are, years, with probably two thousand or more hours on them.

I'm giving three stars as on sound quality they are about average, and assuming 2 bad tubes was just my bad luck.

Great sounding tubes

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I installed a pair of these tubes on a hiwatt clone guitar amp I built. I had a pair of genalex gold lions reissues on this amp and I love them. To be honest I bought the prefered because they special priced. I have a pair of Preferred Series 6L6GC on other of my amps and love the sound. So I decided to give these kt88's a try. Installed them, biased to 60% and started playing. Immediately noticed they sound brighter than the Genalex. More extended and detailed top end. They sound so alive. There is a beautiful natural compression and a kind of vibration that allows you to play the most beautiful cleans with no reverb or other effects. There is like a reverberation on the notes that makes me love them so much. The bottom end is strong but controlled and less mid range than the Genalex. Definitely you all have to try them. I didn't expect to like a kt88 more than the Genalex and I just did. They will stay in my amp.

Not as good as I hoped they would be.


Decent sounding but a bit overpriced. The blue painted bases look very tacky.

Better than stock.


My VTL S400 auto-biasing amp was suffering from failing, VTL supplied and tested EH 6550s. In the space of 2,000 hours I had six faults with a total time on the amp of 2,300 hours, 3,000 hours being the suggested life expectancy. The local VTL distributor strongly advised against non-VTL replacements, although the VTL tubes used as replacements were the ones that were failing.

After great correspondence with Jon, who reassured me there would be no issues, I bought 16x PS KT88s, 12x for the amp and 4x spares.
They arrived via FedEx earlier this week. With some trepidation I installed all 12x, reset a few things and voila, it all burst onto life.

Music is different, and better, than the 6550s. More texture and better clarity, particularly in the bass. Depth imaging is slightly improved, and the sound seems to hang together better. More emotion is coming through. This may be a function of new tubes (less than 30x hours on them), but colour me extremely happy.

Thanks Jon!