JJ KT66 Power Vacuum Tube (Matched)

3 Reviews

Availability: Usually ships within 24 hours.

USD $‎59.95

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.

The new JJ KT66 vacuum tube from JJ Electronic. This KT66 power tube is rated to handle 550V of plate voltage and screen voltage.

From our review: ".... the glass bottle on my sample was very thick and well formed. The tone is very balanced and centered around some thick warm midrange tones. It handles high and lower voltages on the plates equally with no problems biasing."

Other JJ Electronics tubesKT66 Tube Types

Additional Information and Downloads

KT66 Tube Review

Tube Matching Information:
Power Tube Matching FAQ
Perfect Pair System

JJ 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

  • 3 stars
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  • 2 stars
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  • 1 star
  • 0 reviews

Solid, beefy ans stable


They are used in my Soldano HR50. Before, i had both Gold Lion and Shungang. While those might not give you the most authentic KT66 tone, they sound very good, giving a lot of big fat power. And they last forever. Might not be for those who like power tube distortion, but if your amp relies on preamp overdrive, such as the Soldano, well, they just complement the amp's tone perfectly. In short: lots of headroom, plenty of power, very sturdy and stable and, last, a guitar-friendly frequency curve.



Fits the Marshall Bluesbreaker reissue 1962.

Base on JJ KT66


It's PLASTIC not the same as Russian tubes. Sound EXCELLENT no Bear-Trap problems with all plastic base.