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KT90 is a beam-power pentode primarly designed for use in audio
frequency power amplifier applications. Anode dissipation rate is 50W,
which provides for push-pull amplifiers utilization up to 110W output per
pair, with 550V on the anode. Up to 160W per pair may be achieved with
anode voltage of 750V and screen grid voltage of 600V.
KT90 is recommended as a replacement for 6550, 6550A and KT88.
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Key Benefits
- power output
- vastly increased anode and screen grid
maximum voltages
- low distorsion
- extended tube life
General Characteristics
| Heater voltage AC or DC |
6,3 ± 0,6 V |
|
| Heater Current |
1,6 A |
| Direct interelectrode capacitances |
|
| G1 to A |
1,8 pF |
| G1 to (H+C+G2+BF+A) |
29,0 pF |
| A to (H+C+G2+BF+G1) |
10,0 pF |
| Mounting position |
any |
| Envelope |
glass |
| Base |
universal
octal 8-pin |
PIN No.
|
Connection
|
 |
| 1 |
- |
| 2 |
Heater |
| 3 |
Anode |
| 4 |
Grid No. 2 (screen) |
| 5 |
Grid No. 1 |
| 6 |
- |
| 7 |
Heater |
| 8 |
Cathode & Beam Former |
Maximum ratings (absolute)
|
Pentode Connection
|
Triode Connection
|
| UA |
750 V |
600 V |
| UG2 |
650 V |
- |
| UA-UG2 |
650 V |
600 V |
| -UG1 |
200 V |
200 V |
| PA (dissipation) |
50 W |
50 W |
| PG2 |
8 W |
- |
| PA+G2 |
54 W |
- |
| IC |
230 mA |
230 mA |
| Uc-f (total DC) |
300 V |
300 V |
Characteristics using 250V "B+" as a guide
Average characteristics, pentode connection
|
| UA |
250 V |
400 V |
| UG2 |
250 V |
300 V |
| -UG1 |
14 V |
27 V |
| IA |
145 mA |
90 mA |
| IG2 |
8 mA |
4,7 mA |
| -UG1 (IA=1 mA approx.) |
36 V |
42 V |
| gm |
14 mA/V |
8,8 mA/V |
| Ri (approx.) |
11 kOhm |
25 kOhm |
Average characteristics, triode connection
|
| UA,UG2 |
250 V |
| -UG1 |
14 V |
| IA+G2 |
153 mA |
| IG2 |
8 mA |
| gm |
15 mA/V |
| Ri (approx.) |
650 Ohm |
| Amplification factor |
9 |
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