The GS-9b microwave triode is used for RF voltage generation in external-feedback oscillators designed for continuous operation in the decimetric wavelength range down to 9cm. The triode is available in two variants: with heat sink, for forced air cooling (GS-9b), and without heat sink, for other types of cooling (GS-90b). The GS-9b is physically identical to the GI-6b and GI-7b, but several electrical parameters are different. |
GENERAL | |
Cathode: indirectly heated, dispenser, oxide-coated. | |
Envelope: metal-ceramic. | |
Cooling: 18 m^{3}/hr forced air. | |
Height, mm, at most: | with heat sink: 110.5 |
without heat sink: 97 | |
Diameter, mm, at most: | with heat sink: 65 |
without heat sink: 36.3+ | |
Mass, gm, at most: | with heat sink: 330 |
without heat sink: 170 |
NOMINAL ELECTRICAL PARAMETERS | |
Heater voltage, V | 12.6 |
Heater current, A | 1.1 |
Mutual conductance (V_{a} = 1.3KV and I_{a} = 120 mA), mA/V | 19.5 |
Penetration factor (V_{a} = 1.3 kV, delta V_{a} = +200 V, I_{a} = 120 mA), % | 0.6-1.2 |
input capacitance, pF: | 8.4 |
output capacitance, pF: | 3.15 |
transfer capacitance, pF: | <0.04 |
Warm up time, s, at most | 90 |
Output power (CW operation at V_{a} = 1.5KV, I_{a} = 175 mA, wavelength 18cm), W, at least | 40 |
Designed Tube Life (hours) | >200 |
ELECTRICAL PARAMETER LIMITS | |
Heater voltage, V | 11.7-13 |
Heater current, A | 1-1.2 |
Mutual conductance (V_{a} = 1.3KV and I_{a} = 120 mA), mA/V | 15-24 |
input capacitance, pF: | 7.2-9.6 |
output capacitance, pF: | 2.8-3.5 |
V_{a} in CW operation, KV: | 2.5 |
V_{a} (cold cathode), KV: | 3 |
instantaneous value of V_{a} in CW operation, KV: | 5 |
V_{g} (instantaneous value), V: | -200 to +50 |
I_{c} r.m.s.value, mA: | 330 |
I_{c} DC component at frequency doubling, mA: | 190 |
I_{c} instantaneous value under class В conditions, mA: | 700 |
Anode Dissipation, W: | 300 |
Grid Dissipation, neglecting the grid thermal current, W: | 5 |
Grid Dissipation with grid thermal current at most 5 mA, W: | 2.2 |
anode heat sink temperature, °C: | 130 |
grid lead temperature, °C: | 200 |
cathode lead temperature, °C: | 100 |
external ceramic parts temperature, °C: | 250 |
Minimum wavelength in CW operation, cm | 15 |