Shuguang KT66 Power Vacuum Tube (Matched)

3 Reviews

Availability: Usually ships within 24 hours.

USD $‎49.95

Need matched power tubes? Don't worry! Price includes matching in any quantity you need for no extra charge. Need a matched pair? Just order "2" tubes. For a matched quad order "4" tubes. Matched sextets and octets are available as well.

Note: Limited stock available. We have electrically matched sets in stock. Pairs may vary slightly cosmetically because some tubes have logos printed on their bottles and others are blank. Rest assured all are true Shuguang made vacuum tubes.

The Chinese (Sino) Shuguang KT66 power tube is true to the original British made tubes from decades past. They sound wonderful in vintage hifi and guitar amplifiers. Today you'll commonly find them used in the Marshall reissue JTM 45 amoung other amps. We find these tubes need to be biased hot to sound their best. You can learn more about them in our KT66 tube review.

It is acceptable to use in many 6L6 tube amps, but not all.

Other Shuguang tubes      KT66 Tube Types

Additional Information and Downloads

KT66 Tube Review

Tube Matching Information:
Power Tube Matching FAQ
Perfect Pair System

Genalex - Gold Lion KT66 Datasheet (PDF)

Download Adobe Acrobat PDF reader

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

3 reviews

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IMO The best (currently made) KT66 tubes on the market


I usually don't give reviews, but these tubes sound so much better than other makes I feel they need more endorsement. I build amplifiers for many people in the rock and blues business and ship amps all over the world. The KT66 is one of the best output tubes for Marshall style guitar amplifiers and the Shuguang KT66 is IMO one of the best currently made tubes on the market. Both in terms of sound and reliability. They are notably better sounding - you can't go wrong with these tubes...
Kindest Regards

Marshall Bluesbreaker RI use.


Just retubed my mid-90's Marshall Bluesbreaker with the standard Shuguang KT-66's for the second time. They do fit (just) in the old, shallower cabinet. They sound great too - and I've had a set of genuine British Genalex KT-66's in the amp once.

Love 'em!


I had my tech change my Superlead from EL34's to KT66's and I bought a quad of these. My amp sounds wayyyyy better now and I don't know any reason to go back, unless these fail spectacularly!