Data set 01
1963 Siemens
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Heater voltage
6.3 V
Heater current
135 mA
Characteristics
Transconductance
12400 µS
Nominal/Bogey
Nuvistor Tubes (all numbers) ·Triode
8058
Power transmitting triode for RF amplification, oscillation, modulation, or related high-power electronic service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B9A
- Base pins
- 5
- Nominal heater
- 6.3 V / 135 mA
Description
8058 — High-Mu UHF Cathode-Drive Nuvistor Triode
A high-transconductance, low-noise metal-shell Nuvistor designed for grounded-grid RF amplification up to 1,200 MHz and stable oscillator operation.
Overview
The 8058 is a high-mu Nuvistor triode developed for cathode-drive radio-frequency amplification at frequencies up to 1,200 MHz, as well as oscillator applications requiring stability over a wide frequency range. RCA explicitly specifies the 1,200 MHz application, while Siemens describes a steep-slope, low-noise UHF Nuvistor with three externally connected cathode terminals, particularly suited to common-grid amplifiers and stable oscillators.
The distinctive construction includes a plate top cap, metal-shell grid connection, and multiple cathode terminals. These features distinguish the 8058 from more conventional Nuvistor receiving triodes.
Construction, Heater, and Basing
The 8058 uses a coated, indirectly heated unipotential cathode in an MT4 metal-shell Nuvistor envelope. Its specialized E5-79 ceramic-wafer base has 12CT basing. The metal shell serves as the grid connection and the top cap is the plate.
RCA's basing diagram identifies pins 2, 4, and 8 as cathode, and pins 10 and 12 as heater. Other indexed positions are not general-purpose connections.
| Heater and mechanical property | Value |
|---|---|
| Heater voltage | 6.3 V, range 5.7–6.9 V |
| Heater current | 135 mA |
| Calculated heater power | 0.85 W |
| Peak heater-to-cathode voltage | ±100 V |
| Maximum overall length | 0.985 in |
| Maximum seated length | 0.780 in |
| Maximum diameter | 0.440 in |
| Approximate weight | 2.2 g |
| Mounting position | Any |
The specialized electrode and connection arrangement is intended for high-frequency circuit layouts where connection geometry and grounding are important.
Cathode-Drive RF Amplifier Performance
RCA gives specific cathode-drive amplifier examples at three frequencies:
| Parameter | 450 MHz | 700 MHz | 1,200 MHz |
|---|---|---|---|
| Plate supply | 110 V | 110 V | 110 V |
| Cathode resistor | 47 Ω | 47 Ω | 47 Ω |
| Average plate current | 10 mA | 10 mA | 10 mA |
| Bandwidth | 6 MHz | 12 MHz | 12 MHz |
| Power gain | 16.5 dB | 12.5 dB | 10.5 dB |
| Noise factor | 6.5 dB | 9.5 dB | 12.2 dB |
These are representative circuit operating results; actual gain, bandwidth, and noise depend on the tuned amplifier arrangement.
The noise figures are based on an argon noise source with the input tuned for optimum value. They are circuit-specific measurements rather than intrinsic noise figures independent of the surrounding amplifier.
Class A1 Electrical Characteristics
| Characteristic | Typical value |
|---|---|
| Plate supply voltage | 110 V |
| Grid supply voltage | 0 V |
| Cathode resistor | 47 Ω |
| Plate current | 10 mA |
| Transconductance | 12,400 µmhos (12.4 mA/V) |
| Amplification factor | 70 |
| Plate resistance | Approximately 5,600 Ω |
| Grid voltage at 10 µA plate current | Approximately −5 V |
The figures satisfy the approximate triode relationship μ ≈ gₘ × rₚ: 0.0124 S × 5,600 Ω ≈ 69.4.
RCA specifies initial transconductance acceptance limits of 10–14.8 mA/V and amplification factor 54–86.
Maximum Ratings
| Parameter | Maximum |
|---|---|
| Plate supply voltage | 330 V |
| Actual DC plate voltage | 150 V |
| Plate dissipation | 1.5 W |
| Average cathode current | 15 mA |
| Positive DC grid voltage | 0 V |
| Negative DC grid voltage | 55 V |
| Fixed-bias grid-circuit resistance | 0.5 MΩ |
| Cathode-bias grid-circuit resistance | 1 MΩ |
The plate-supply and actual plate-electrode limits must be distinguished. Grid-circuit resistance ratings depend on the metal-shell temperature; RCA provides a temperature-dependent rating chart.
Interelectrode Capacitances
| Measurement | Value |
|---|---|
| Cathode to grid, shell, and heater | 6.0 pF |
| Plate to grid, shell, and heater | 1.3 pF |
| Cathode to plate | ≤0.046 pF |
| Heater to cathode | 1.4 pF |
The extremely small cathode-to-plate capacitance is particularly relevant to the common-grid cathode-drive amplifier configuration because it limits direct input-output electrode coupling.
Industrial Qualification
RCA documents 1,000 g impact-shock testing, variable-frequency vibration tests, low-pressure breakdown tests, heater cycling, shorts testing, and 1,000-hour conduction-life evaluation.
The variable-frequency vibration test specifies maximum output disturbances of 35 mV RMS at 50–3,000 Hz, 80 mV peak at 3–6 kHz, and 700 mV peak at 6–15 kHz, under the stated 1 g test arrangement.
The low-pressure test simulates 100,000 feet altitude using 250 V RMS applied between plate and other electrodes. RCA also specifies at least 2,000 heater cycling operations under the defined test.
Siemens separately describes long-life and reliability characteristics, including a service-life specification exceeding 10,000 hours under its quality requirements.
Technical Summary
The 8058 is a 6.3 V / 135 mA high-mu UHF Nuvistor triode for cathode-drive common-grid RF amplification up to 1,200 MHz and stable oscillator service. It has approximately 70 amplification factor, 12.4 mA/V transconductance, 5.6 kΩ plate resistance, and 10 mA plate current at its principal operating point.
Its top-cap plate, metal-shell grid, three cathode terminals, extremely small cathode-to-plate capacitance, and extensive industrial qualification make it a specialized high-frequency amplifier tube.
Socket description
Small-button Noval 9-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B9A
- Base pins
- 5
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 135 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
1 physical section, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 5600 Ω
- Transconductance
- 0.0124 S
- Amplification factor
- 70
- Max plate voltage
- 150 V
- Max plate dissipation
- 1.5 W
- Max cathode current
- 15 mA
Published promoted values applied where semantically applicable; additional source-table values retained in TUBE_SECTION_PARAMETER.
Source-dependent data
Operating conditions by source
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 02
1971 RCA HB3 Binder 3 of 7
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristics
Heater Voltage, AC or DC
6.3 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
/~"\ — published value 1
6.3 mA
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
/~"\ — published value 2
135 mA
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Cathode to plate
0.046 mA
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Heater to cathode
1.4 pF
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Amplification Factor
70
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Plate Resistance (Approx.)
5600
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Transconductance
12400
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
DC Plate Current
10 mA
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Cutoff DC Grid Voltage for Ib = 10 µA — published value 1
10 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Cutoff DC Grid Voltage for Ib = 10 µA — published value 2
-5 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Heater Voltage
6.3 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Plate Supply Voltage
10 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Grid Supply Voltage
0 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Plate Supply Voltage
330 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
DC Plate Voltage
150 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Peak Heater-Cathode Voltage
100 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Heater Voltage, AC or DC — published value 1
5.7 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Heater Voltage, AC or DC — published value 2
6.9 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Average Cathode Current
15 mA
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
For fixed-bias operation
0.5
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Pin 10 -Heater
10
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Pi n 12 -Heater
12
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Frequency — published value 1
450
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Frequency — published value 2
700
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Frequency — published value 3
1200
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Heater Voltage — published value 1
6.3 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Heater Voltage — published value 2
6.3 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Heater Voltage — published value 3
6.3 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Plate Supply Voltage — published value 1
10 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Plate Supply Voltage — published value 2
10 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Plate Supply Voltage — published value 3
10 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Average Plate Current — published value 1
10 mA
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Average Plate Current — published value 2
10 mA
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Average Plate Current — published value 3
10 mA
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Heater Current — published value 1
0
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Heater Current — published value 2
125
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Heater Current — published value 3
0
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Heater Current — published value 4
145
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Cathode to plate — published value 1
2 pF
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Cathode to plate — published value 2
0.046 pF
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
and heater — published value 1
2 pF
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
and heater — published value 2
5 pF
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
and heater — published value 3
7 pF
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
and heater — published value 1
2 pF
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
and heater — published value 2
1.5 pF
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Heater to cathode — published value 1
2 pF
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Heater to cathode — published value 2
1.7 pF
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Plate Current (I) — published value 1
1 mA
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Plate Current (I) — published value 2
3 mA
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Plate Current (I) — published value 3
7.8 mA
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Plate Current (I) — published value 4
13.2 mA
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Plate Current (2) — published value 1
2
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Plate Current (2) — published value 2
1
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Plate Current (2) — published value 3
4
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Plate Current (2) — published value 4
50
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Transconductance (I) — published value 1
1
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Transconductance (I) — published value 2
3
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Transconductance (I) — published value 3
10000
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Transconductance (I) — published value 4
14800
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Transconductance (2 — published value 1
2
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Transconductance (2 — published value 2
3
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Transconductance (2 — published value 3
5
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Transconductance (2 — published value 4
8700
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Reverse Grid Current — published value 1
6
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Reverse Grid Current — published value 2
0
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Reverse Grid Current — published value 3
1
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Current — published value 1
1
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Current — published value 2
7
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Current — published value 3
5
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
current issue of EIA Standard RS-191,
191
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
(1) with the addition of a plate-load resistor of 2000 ohms — published value 1
1 ohm
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
(1) with the addition of a plate-load resistor of 2000 ohms — published value 2
2000 ohm
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
tube must not show an output voltage in excess of: (1) 35 — published value 1
1 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
tube must not show an output voltage in excess of: (1) 35 — published value 2
35 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
= 7.5 cycled one minute on end two minutes off; heater 100 — published value 1
7.5
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
= 7.5 cycled one minute on end two minutes off; heater 100 — published value 2
100
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
dissipation and with a metal-shell temperature of 150 °C; then
150
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
(ac or dc) = 6. 3, plate volts = 300 negative with respect to — published value 1
6 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
(ac or dc) = 6. 3, plate volts = 300 negative with respect to — published value 2
3 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
(ac or dc) = 6. 3, plate volts = 300 negative with respect to — published value 3
300 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
(ac or dc) = 6. 3, grid volts = 100 negative with respect to — published value 1
6 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
(ac or dc) = 6. 3, grid volts = 100 negative with respect to — published value 2
3 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
(ac or dc) = 6. 3, grid volts = 100 negative with respect to — published value 3
100 V
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.
Other
tubes are operated for 1000 hours at maximum-rated plate
1000 mA
Published datasheet value; multiple numbers on a source row represent separate limits or operating conditions.