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Genalex Gold Lion KT77 reissue - precision matched

Genalex Gold Lion KT77 reissue - premium matched
Manufacturer: Genalex Gold Lion (reissue)
These new production Genalex Gold Lion KT77 power tubes can substitute for 6CA7 or EL34 type tubes.* 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 with gold plated grid wire, carbonized screen grids, and a tri-alloy clad plate structure for exceptional performance and sound quality. 

These tubes have been burned in, tested at typical operating voltages on a laboratory grade Amplitrex AT1000, and precisely matched for both current draw (mA) and transconductance (Gm). Learn more about our burn-in and testing process here.

Price is for a single tube and includes burn-in and standard matching service. Tubes ship in Genalex Gold Lion retail boxes.
* PLEASE NOTE: If you plan to substitute KT77 tubes in an application that is designed for EL34s please TELL US (
especially if your amplifier will run them at plate voltages 500V or higher).

Precision Power Tube Matching

Our power tubes are burned in and then tested on a laboratory grade Amplitrex AT1000 tube tester. We match tubes for both current draw (mA) and transconductance (Gm) at typical operating conditions (plate: 500V, screen: 450V, grid bias: -41.5V).

After burn in and testing, we hand select and custom match every power tube order we receive. To do this, each power tube set is also run on a custom, fully variable test fixture that can match the operating conditions of your amplifier based on the information you provide below. This enables us to do a final check of the power tube set's performance and matching under load. Why this matters
1. What is the manufacturer and model of your amplifier?
2. How is your amp biased?   Why we ask
3. Matching notes   Why we ask
If you know the plate, screen, and grid bias voltages your amplifier uses, please note them in the comments section when you check out and we will use this information when we select and match your power tube set. (If you don't know, don't worry--we can make an educated guess based on your amp's make and model, if we don't already know the voltages it uses.) If you are a guitarist, you can also specify if you prefer early or late breakup. Thanks!


Price per single tube: $52.00

Enter total number of tubes needed for your matched set

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TC Tubes specializes in precision testing and matching of vintage and new production vacuum tubes for guitar & bass players, audiophiles, and DIY tube audio enthusiasts. Our website features secure payment options and fast, convenient shipping around the world.

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