Genalex - Gold Lion KT77

12 Reviews

Availability: Usually ships within 24 hours.

USD $‎55.95
After extensive research and engineering, New Sensor Corp. has reissued the famed Genalex Gold Lion KT77. This tube has been recreated down to the finest detail for exceptional performance and sound quality.

For audiophiles, the Genalex/Gold Lion KT77 tubes have full, yet tight and dynamic lows. They have great clarity in the mid-range as well, and extended highs. Many audiophiles that have previously enjoyed the Winged "C"/SED EL34 tubes have reported that these KT77 tubes are noticeably better.

From our review in guitar amps: "The Gold Lion KT77 is a drop in replacement for an EL34 or 6CA7. The sound however is not typical of an EL34 or 6CA7. It is more of a hybrid. The tube delivers all the mid punch you would expect in an EL34 but also has a top end that is more open and bright. It’s definitely got a bit of a 6L6 designed into it. I tested it in Marshall 2205 50w head and was able to get that 70’s rock sound but with some bias adjustment could also dial in a VOX-like chime."

If you are curious about how these fare in a hifi stereo amplifier be sure to read the Wall of Sound EL34 tube comparison for details.

Other Genalex - Gold Lion tubesEL34 Tube Types

Additional Information and Downloads

EL34 Tube Review for Guitar Amplifiers
EL34 Tube Review for HiFi Audio

Tube Matching Information:
Power Tube Matching FAQ
Perfect Pair System

Genalex - Gold Lion KT77 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

12 reviews

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Went from good to GREAT! Worthy of the praise!


Lighting fast delivery and let's just say WOW! Went from good to GREAT! Had Tung-Sols (albeit they were aging) these new tubes just expanded the sound stage, vocals are beautifully resonant, the air the space is just amazing. Well worth the investment, I am sure as they start to burn in they will warm up. The bass is also right in the sweet spot with the mid bass just right. Thanks guys great purchase.

EL34 vs KT77


Ran a quad of these in a CJ Classic 60SE wired in UL. They were terrific and the best tube I used in the CJ. Plan is for another quad to go into my current Cary Rocket 88 which I run in triode with a set of the reissue Tung-Sol EL34s, which are also excellent. Will be an interesting comparison. Hope it is worth the price difference.

Wow just like I got a new amp when these went into my old amp.


I have a 16 year old Cayin TA30 integrated amp, which was a legendary budget integrated amp in its time. I am using it as a power amp, though, with a Tube Audio Design TAD-150 pre-amp.

My previous tubes were JJ KT77, which were 12 years old but still sounding great. But I decided to splurge this year and get these Genalex GL's after hearing great things about them.

The improvement is quite amazing. A bit warmer, with great tone and quieter too. Soundstage and imaging is also noticeably improved.

Best EL34 Replacement Ever!

by -

It's amazing how much better my amp sounds with these tubes in it. Tight bass, detailed mids, airy highs. The harmonics just sound and feel richer and more alive with them. This is my second set after having made the mistake of trying other tubes in between. I'm a big fan.

The Gold Lion has landed!


Simply put, these are the best power tubes I've ever used. I've tried *most* of all the newer, current production tubes over the past 1.5 decades, and these tubes top them all. I would put them on par, or even better then the coveted Svetlana Winged Cs. Their every bit as sweet and musical as the Winged Cs in which are better imo then all other current production tubes..but produce more of what everything the Winged C offers. Their powerful, exude excellent, tight low frequencies, warm, very musical mid range, and a top end that is smooth and pleasing. Build construction appears excellent as their a work of art to behold! Great looking tubes. Genalex homered with this one!