T-KT77-GEN-MP - Matched Pair version | Amplification Factor | 11.5 |
Bulb Temperature | 250°C |
Capacitance, Grid to Others | 16.5 pF |
Capacitance, Plate to Others | 9.0 pF |
Capacitance, grid to plate | 1.0 pF |
Cathode Current (Ik) | 200 mA |
Grid Circuit Resistance (Rg), Cathode Bias | 1 MΩ |
Grid Circuit Resistance (Rg), Fixed Bias | 0.5 MΩ |
Grid Voltage (Ug) | -220 V |
Heater-Cathode Voltage (Uh/k) | 200 V |
Heater Current | 1.4 A |
Heater Voltage | 6.3 V |
Plate Dissipation (Wa) | 32 W |
Plate Resistance (Ra) | 23 kΩ |
Plate Voltage (Ua) | ≤ 800 V, 250 V typical |
Screen Dissipation | 6.0 W |
Screen Voltage | ≤ 650 V, 250 V typical |
Transconductance (S) | 10.5 mA/V |
T-KT77-GEN-MQ - Matched Quad version | Amplification Factor | 11.5 |
Bulb Temperature | 250°C |
Capacitance, Grid to Others | 16.5 pF |
Capacitance, Plate to Others | 9.0 pF |
Capacitance, grid to plate | 1.0 pF |
Cathode Current (Ik) | 200 mA |
Grid Circuit Resistance (Rg), Cathode Bias | 1 MΩ |
Grid Circuit Resistance (Rg), Fixed Bias | 0.5 MΩ |
Grid Voltage (Ug) | -220 V |
Heater-Cathode Voltage (Uh/k) | 200 V |
Heater Current | 1.4 A |
Heater Voltage | 6.3 V |
Plate Dissipation (Wa) | 32 W |
Plate Resistance (Ra) | 23 kΩ |
Plate Voltage (Ua) | ≤ 800 V, 250 V typical |
Screen Dissipation | 6.0 W |
Screen Voltage | ≤ 650 V, 250 V typical |
Transconductance (S) | 10.5 mA/V |
T-KT77-GEN - Single version | Amplification Factor | 11.5 |
Bulb Temperature | 250°C |
Capacitance, Grid to Others | 16.5 pF |
Capacitance, Plate to Others | 9.0 pF |
Capacitance, grid to plate | 1.0 pF |
Cathode Current (Ik) | 200 mA |
Grid Circuit Resistance (Rg), Cathode Bias | 1 MΩ |
Grid Circuit Resistance (Rg), Fixed Bias | 0.5 MΩ |
Grid Voltage (Ug) | -220 V |
Heater-Cathode Voltage (Uh/k) | 200 V |
Heater Current | 1.4 A |
Heater Voltage | 6.3 V |
Plate Dissipation (Wa) | 32 W |
Plate Resistance (Ra) | 23 kΩ |
Plate Voltage (Ua) | ≤ 800 V, 250 V typical |
Screen Dissipation | 6.0 W |
Screen Voltage | ≤ 650 V, 250 V typical |
Transconductance (S) | 10.5 mA/V |
Product Reviews
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.
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.
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.