Vacuum Tube - KT77, Genalex Gold Lion

Genalex
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Customer image: "Jolida JD1000P 100% Genalex Gold Lion Tubes"

Vacuum Tube - KT77, Genalex Gold Lion

Starting at: $76.65
In Stock

Genalex Gold Lion KT77 beam-power tetrode tube. Made in Russia.

A beam tetrode with an absolute maximum anode dissipation rating of 32 watts. The KT77 is designed for use in the output stage of an af amplifier. Two valves in Class AB1 give a continuous output of over 70 W.

SKU:
T-KT77-GEN
Item ID:
039548
Brand:
Genalex
Type:
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
SingleT-KT77-GEN841358102554
Matched PairT-KT77-GEN-MP841358102561
Matched QuadT-KT77-GEN-MQ841358102578
Amplification Factor11.5
Bulb Temperature250°C
Capacitance, Grid to Others16.5 pF
Capacitance, Plate to Others9.0 pF
Capacitance, grid to plate1.0 pF
Cathode Current (Ik)200 mA
Grid Circuit Resistance (Rg), Cathode Bias1 MΩ
Grid Circuit Resistance (Rg), Fixed Bias0.5 MΩ
Grid Voltage (Ug)-220 V
Heater-Cathode Voltage (Uh/k)200 V
Heater Current1.4 A
Heater Voltage6.3 V
Plate Dissipation (Wa)32 W
Plate Resistance (Ra)23 kΩ
Plate Voltage (Ua)≤ 800 V, 250 V typical
Screen Dissipation6.0 W
Screen Voltage≤ 650 V, 250 V typical
Transconductance (S)10.5 mA/V
Packaging Information
Packaging DimensionsMatched Pair versionT-KT77-GEN-MP4.79 in. × 3.47 in. × 1.74 in.
Matched Quad versionT-KT77-GEN-MQ4.79 in. × 3.47 in. × 3.47 in.
Single versionT-KT77-GEN4.75 in. × 1.75 in. × 1.75 in.
Weight (Packaging)Matched Pair versionT-KT77-GEN-MP0.2778 lbs.
Matched Quad versionT-KT77-GEN-MQ0.5556 lbs.
Single versionT-KT77-GEN0.1301 lbs.
T-KT77-GEN-MP - Matched Pair versionAmplification Factor11.5
Bulb Temperature250°C
Capacitance, Grid to Others16.5 pF
Capacitance, Plate to Others9.0 pF
Capacitance, grid to plate1.0 pF
Cathode Current (Ik)200 mA
Grid Circuit Resistance (Rg), Cathode Bias1 MΩ
Grid Circuit Resistance (Rg), Fixed Bias0.5 MΩ
Grid Voltage (Ug)-220 V
Heater-Cathode Voltage (Uh/k)200 V
Heater Current1.4 A
Heater Voltage6.3 V
Plate Dissipation (Wa)32 W
Plate Resistance (Ra)23 kΩ
Plate Voltage (Ua)≤ 800 V, 250 V typical
Screen Dissipation6.0 W
Screen Voltage≤ 650 V, 250 V typical
Transconductance (S)10.5 mA/V
T-KT77-GEN-MQ - Matched Quad versionAmplification Factor11.5
Bulb Temperature250°C
Capacitance, Grid to Others16.5 pF
Capacitance, Plate to Others9.0 pF
Capacitance, grid to plate1.0 pF
Cathode Current (Ik)200 mA
Grid Circuit Resistance (Rg), Cathode Bias1 MΩ
Grid Circuit Resistance (Rg), Fixed Bias0.5 MΩ
Grid Voltage (Ug)-220 V
Heater-Cathode Voltage (Uh/k)200 V
Heater Current1.4 A
Heater Voltage6.3 V
Plate Dissipation (Wa)32 W
Plate Resistance (Ra)23 kΩ
Plate Voltage (Ua)≤ 800 V, 250 V typical
Screen Dissipation6.0 W
Screen Voltage≤ 650 V, 250 V typical
Transconductance (S)10.5 mA/V
T-KT77-GEN - Single versionAmplification Factor11.5
Bulb Temperature250°C
Capacitance, Grid to Others16.5 pF
Capacitance, Plate to Others9.0 pF
Capacitance, grid to plate1.0 pF
Cathode Current (Ik)200 mA
Grid Circuit Resistance (Rg), Cathode Bias1 MΩ
Grid Circuit Resistance (Rg), Fixed Bias0.5 MΩ
Grid Voltage (Ug)-220 V
Heater-Cathode Voltage (Uh/k)200 V
Heater Current1.4 A
Heater Voltage6.3 V
Plate Dissipation (Wa)32 W
Plate Resistance (Ra)23 kΩ
Plate Voltage (Ua)≤ 800 V, 250 V typical
Screen Dissipation6.0 W
Screen Voltage≤ 650 V, 250 V typical
Transconductance (S)10.5 mA/V

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet2.09 MB
Questions? Contact us at [email protected], or give us a call at 480-296-0890

Product Reviews

3.67 out of 5 based on 3 reviews
FrostEOne - December 22nd, 2022
5 out of 5

Jolida JD 1000P came with 8 Electro-Harmonix EL34 installed.
Upgraded the 2 12AX7s and 2 12AT7s with Genalex Gold Lion shortly after purchasing, really liked them.
Tried a set of 8 Electro-Harmonix 6CA7s but just wasn't impressed, went back to the EL34s.
Recently purchased 2 matched quad sets of Genalex Gold Lion KT77s and installed them.
Bias set and broke them in for 6 hours, then rechecked and adjusted each bias slightly.
I am truly impressed, they are much richer sounding and very clear.
I've now changed all my tubes to Genalex Gold Lion, best sounding tube I've tried.

keshav.bahadoor - November 29th, 2022
1 out of 5

I purchased these earlier this year (August) and now got around to installing them on a Laney TT50C combo amp. Previously, I had JJ KT77's in this amp that worked fine (just sounded a bit harsh compared to EL34s).

When I installed the Gold Lion KT77's, I noticed that one tube is glowing a lot brighter than the other. If I leave the amp on for more than 10 minutes I randomly hear a very loud fog horn like noise. At this point it is unusable and I need to turn the amp off. Having tried multiple EL34s, and KT77s in this amp, I am convinced I received a defective pair of gold lions.

Note that when I purchased the pair, I stored them in a dry safe place in my house until I was ready to use them. I am disappointed as I paid a lot for this pair.

Sugar - March 10th, 2021
5 out of 5

Like Mullard XF2's. I always play loud. Which means the power tubes get judged. I like these. Usually I use 6CA7'S in my EL34 driven Marshalls.

These sound/feel great! They are spendy. For classic rock like ACDC? Yeah man. Make you want to Tarzan out. Unadulterated ear pleasure.

Seriously? Very nice overdriven harmonic tubes.