Vacuum Tube - KT77, Genalex Gold Lion
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Starting at: $76.65
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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.
| Single or Matched | Our Part Number | UPC/EAN |
|---|---|---|
| Single | T-KT77-GEN | 841358102554 |
| Matched Pair | T-KT77-GEN-MP | 841358102561 |
| Matched Quad | T-KT77-GEN-MQ | 841358102578 |
| 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 | ||
| Packaging Dimensions | Matched Pair version | T-KT77-GEN-MP | 4.79 in. × 3.47 in. × 1.74 in. |
| Matched Quad version | T-KT77-GEN-MQ | 4.79 in. × 3.47 in. × 3.47 in. | |
| Single version | T-KT77-GEN | 4.75 in. × 1.75 in. × 1.75 in. | |
| Weight (Packaging) | Matched Pair version | T-KT77-GEN-MP | 0.2778 lbs. |
| Matched Quad version | T-KT77-GEN-MQ | 0.5556 lbs. | |
| Single version | T-KT77-GEN | 0.1301 lbs. |
| 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 |
 Specification Sheet | All Models |
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Product Reviews
I’ve had one tube in each of the two quads I’ve ordered fail prematurely. In each case the cathode tube was not inserted through the bottom mica support, just the heater wire were coming through. They both went with red plates (short), fortunately I caught it quickly both times and no damage was done to my amp. They did sound very good though while they worked, very sloppy of “Genelex?” to let these pass quality control, the defect was obvious.
these are very well made reliable tubes that will take more abuse That most EL34 's because their ratings are much higher. Be careful not to over bias... a pair of these in push Pull operation can produce up to 70 watts...When I have used these I bias them to 60%-70 % like any EL34 and forget about it.
I am very pleased with these tubes. They are replacing some Svetlana EL34's that are still within spec from the '90's in a hi-fi (The Svetlanas, no longer manufactured, now go for big bucks.) These new KT77's IMHO are better in every way.