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Tung-Sol KT120

$49.95
Quantity:

Product Description

Tung-Sol KT120 - Super cool KT88 variant made by New Sensor in Russia. This tube is a drop-in replacement for KT88s... no special re-wiring required! The KT120 is rated to have a plate dissipation of 60W... compared with the 35W of the 6550, the 42W of the KT88, that's a lot of juice!

The KT120 also draws more current from your amp's output transformer(s).  Before you buy them, check with your amp's manufacturer to make sure you've got enough headroom.

One quick note: The KT120 is about 1/2" taller than a typical KT88, so if your KT88s are already a tight squeeze in your equipment, you may want to measure to make sure you have enough clearance before placing an order.

Pricing above includes matching in any quantity you need at no extra charge.

All power tubes are Platinum Screened & Tested to the highest standards, including a 72-hour burn in process, and testing at real-world voltages.





Product Videos

Upscale Audio's Kevin Deal reviews the Tung Sol KT120

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Warranty Information

Vacuum tubes are warranted for 90 days against defects, except in cases of abuse, and replaced with like-item only.

Vacuum tubes are warranted for 90 days against defects, except in cases of abuse, and replaced with like-item only.

  • Tubes being sent in for warranty must have a return authorization number from Upscale Audio. This RA number must be written on the outside of the box. Please also include a note in the box that has your name and telephone number, and please explain the issues with the tube. If this information is missing it will delay the shipment of your replacement tube.
  • Vacuum tubes being sent to Upscale Audio for warranty replacement must be shipped in a box with appropriate packaging to keep them from being damaged. Vacuum tubes returned to Upscale Audio using inadequate packing will have a voided warranty and will be refused at the customer's expense.


Exceptions to our warranty policy are as follows:

  • Upscale Audio reserves the right to refuse warranty at our disgretion based on the equipment being re-tubed. You will be notified of any change prior to your order being processed.
  • Using a tube in an application in which it was not meant to be used. If your amp calls for a 6550, and you decide you want to plug in a 6V6GT, Upscale Audio is not liable if the tube fails, and will not honor any warranty in such a situation.

Upscale Audio is not liable for any damage or injury caused by the improper use of its tubes or the use of an incorrect/incompatible tube type. If you are unsure of what tube or tubes your equipment uses, consult the manufacturer before making a purchase. Using an incompatible tube type may cause severe damage to your equipment and will void your tube's warranty.


vacuum tube returns for refund:

Vacuum tubes are electronic parts and are not refundable under any circumstances.

Other Details

Cryogenic Treatment:

Product Reviews

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  1. PrimaLuna Dialogue One integrated

    Posted by Scott W on 10th Nov 2014

    Plopped these in and, oh, it's quite the scene man. If you too own a PL product, what are you waiting for?

  2. More QUALITY juice from my PrimaLuna 3&5 Prologue combi.

    Posted by Rens51 on 27th Mar 2014

    I wrote a review also for the Philips 5R4GYS Made in Holland rectifier tubes that I replaced at the same time. These KT120 bring me more power and authority over my PL KT-88's, to my low sensitivity ProAc Response 2,5S speakers. The KT-88's were also about end-of-life. Have now ±100 hours playtime on the set, and overall a noticeable quality step-up!! The jury is still out how / if this will further improve, so 4 stars. For more experience see my write-up with the Philips 5R4GYS's. Reason to buy from Upscale audio (and import to Holland at a cost) was their testing and cryogenic treatment option. Very happy also with the customer services and related communications thru the site. Thanks to Kevin and Team!!

  3. Steroids for Cary SLi80

    Posted by Frank Hardly on 20th Dec 2013

    I had some nice Gold Lion KT88's in my Cary, but these tubes juice up the performance to a whole new level. Increase in bass and dynamics and a lift in sound stage depth. Altogether a great upgrade for an already fantastic amp. Not the sort of thing one can play around with in the solid state world.

  4. KT 120s replaced in PrimaLuna ProLogue Seven Monoblocks

    Posted by T. G. Titus on 27th Nov 2013

    I found it interesting that Conrad Johnson and Audio Research are migrating to KT 120 based amps, and since the 120s are a simple drop-in in PrimaLuna amps I thought I’d give them a try.
    The most noticeable improvement is in the low end and it ain’t subtle. The bass is noticeably stronger, weightier, and more authoritative. The Telarc bass drum whacks are scary good. Even lightly struck bass drums and double basses are more prominent. Other users have reported the same effect. I must admit that I’m not sure of improvements in other areas. PrimaLuna’s stock KT 88s are awfully good. Lastly, the 120s are dead quiet.

  5. Makes my amp purr

    Posted by James C on 3rd Oct 2013

    These valves replaced the stock KT88s in a Prima Luna Dialogue premium, driving Focal 1008 Be speakers. I loved the KT88s, but the 120's just deliver more authority and punch. I tried the Prima Luna EL34s, which felt thin and weedy, and didnt stay in the amp for very long at all. These tubes have turned the best amp/speaker combo I have ever owned into something even better. Fantastic. As an added bonus they appear to be the same tubes that Prima Luna brand as their own and sell for about twice the price here in Australia. What is there not to like about that.

  6. New life to old amp!

    Posted by Uncle Clyde on 20th Jul 2013

    I replaced failing Kt88s with the Tung-Sol KT120
    in my Pete Millett E-Linear SE KT88 amp. A great improvement!! More authority from top to bottom and very smooth.

    There was a lack of "snap" that I wanted until raised the plate voltage to about 440v. In my amp this seems to be the sweet spot.

  7. ending the tube search

    Posted by andy bruns cazenovia ny on 2nd Nov 2012

    My search for tubes for my rogue cronus magnum has ended.I have tried el34's, kt77's,kt90's,6ca7 treasure and finally the kt120's.All i can say is WOW !!. this is the finest tube that i have ever heard in this amp. powerful lows,crisp clean and soaring highs, they just lit up this amp like no other tubes. I am so glad that I tried the cryo version, an outstanding product.If you have a rogue magnum or any amp that can use this tube you should try them. I have never written a fan letter for a tube but these are worth it.

  8. An excellent choice

    Posted by Joe on 30th Jun 2011

    Even response along the frequency range with an extended top that’s not bright. Soundstage is very good. I didn’t find them to be obviously more powerful, however, there’s an effortlessness to their sound with a wide dynamic range that maybe tells the real story. Among current production tubes the Tung-Sol Reissue 6550s are among my favorites and to that small group I’d have to add these KT-120s. I’d purchase them again. (This review is based on listening to eight of them in a conrad-johnson Premier 140 amplifier over QUAD ESL-989 speakers.)