Tung-Sol KT66

2 Reviews

Availability: Usually ships within 24 hours.

USD $‎37.95
From our review of the Tungsol KT66 tube: "Big and open with very solid lows and smooth treble response. The mids are well balanced and don’t go to the extremes of sounding scooped or nasal."

If your amp has "bear trap" tube retainers they will have to go because of the size of the tube's base but also the bear trap clamp will ground the metal base to the chassis and cause a malfunction. The Tung-Sol name and trademark have been acquired by the New Sensor Corporation. This new production Tungsol tube is manufactured at their Xpo-Pul factory (also known as Reflektor) in Saratov, Russia. New Sensor is an American corporation and since taking ownership of this factory has been steadily improving the quality of current production tubes.

Other Tung-Sol 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

2 reviews

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Tung-Sol TS-KT66 review


WOW!! What an improvement. Put a set into a JTM 45 that I use as a clean platform for pedals.Huge sounding valve. The entire frequency spectrum is enhanced by this tube. My Strat has never sounded so good. Highly recommended.

Fantastic in a W5-M amp


Nice tube. The sound is very detailed, top to bottom with deep bass and super clear high. These tubes have a headroom with a lot of reserve. Bias is super stable. No complaints so far.