Shuguang Treasure KT88-Z Power Vacuum Tube

2 Reviews
Out of Stock
USD $‎119.95

Only one tube left in stock!

The Shuguang Treasure series KT88-Z power tube sounds fantastic and looks great too. A previous Shuguang KT88 vacuum tube called the KT88-98 tied for top spot in our blind KT88/6550 listening tests and so we're excited about this new premium KT88 version. 

The KT88-Z tube's construction features gold grid wires and a new internally coated black glass bottle. This unique HPCC coating is known as High Polymer Carbon Compound glass coating and is unique for its ability to reduce stray electron emission that can otherwise reflect off the glass. Shuguang also uses their new "Super Alloy" technology. Originally applied to aviation, aerospace, and military applications, this technology has been successfully used by Shuguang to accomplish directional solidification and single crystallization. This greatly improves the ability of electron emission and electron current stability. This new Shuguang Treasure series required additional parts selection quality control processes, improved vacuum techniques and additional burn-in time and testing. This Shuguang Treasure KT88-Z tube is their premium export grade and purchased direct from Shuguang in China.

Other Shuguang Treasure tubes       KT88 Tube Types

Additional Information and Downloads

Tube Matching Information:
Power Tube Matching FAQ
Perfect Pair System

Warranty Information and Return Policy

Warranty Period: 3 months

All our tubes are guaranteed for 3 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 90 days 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 3 month, or are returned improperly.

These guidelines may be updated without notice.

Ratings & Reviews

2 reviews

  • 4 stars
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  • 1 star
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Fantastic sound quality depends on the warming time


Sounds fantastic, but after 150 - 300 hours of warming! Under one or two weeks tubes reaches fullness of its sound. The warming time depends on the amplifier in which they are to work. Any opinion about this tubes after two or three days of warming is not true. In my opinion they are ultimately much better than the Gold Lion KT88.

Nice tube but didn't stand up to the expectations....


I have a matched quad Gold Lions in my Sansui BA303 and was looking for a possible improvement.
A friend of mine give the advice to try these Shu Guang KT88 Z (black treasure).
Like always you can find good things and also less positive writings on the internet. The only way to know is to try yourself.

After placing these and set the bias correct i noticed immediateley quite a difference. They sounded more warm and less detailed then the GL.
I give them some days to get use to.....
But instead of get use to them i get more nervous about the sound.
Most important was that the "life" in the music was gone. Voices did miss quite some involvement. And i guess this was not due to the break in period. Some things need to be correct from the beginning.

After 2 days of listening it was an relief when i placed my GL back in and heard them singing....