Data set 01
1959 Telefunken
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Maximum frequency
800 MHz
Application
Application
Grounded-grid UHF amplifier
Voltage - Triode (single high frequency) ·Triode
6CM4
Telefunken 6CM4 indirectly heated grounded-grid UHF amplifier triode for frequencies up to 800 MHz, with 14 mA/V transconductance.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- 9
- Nominal heater
- 6.3 V / 170 mA
Description
6CM4 is listed in the supplied Amperex material as a high-gain frame-grid UHF triode. Published operating conditions and characteristics were captured from the supplied table.
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- 9
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 170 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
- Transconductance
- 0.014 S
- Amplification factor
- 68
- Max plate voltage
- 220 V
- Max plate dissipation
- 2.2 W
- Max cathode current
- 20 mA
Telefunken 6CM4 1959 JEDEC #2405 and Amperex 1963: grounded-grid UHF triode for amplification to 800 MHz. Heater 6.3 V 0.17 A; typical plate 175 V, grid -1.5 V, Ia 12 mA, gm 14000 µmhos = 0.014 A/V, mu 68. Maximum plate 220 V, dissipation 2.2 W, cathode current 20 mA, negative grid voltage magnitude 50 V, grid-circuit resistance 1 MΩ. Equivalent noise resistance ~230 Ω, at 100 MHz transconductance phase -7 degrees and additional grid noise conductance 0.5 mmhos. Nine-pin grounded-grid electrode connections and interelectrode capacitances are in manufacturer sheet. Plate resistance not specified; leave null.
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
1963 Amperex Condensed
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Plate voltage
175 V
Published table
Control-grid bias
-1.5 V
Published table
Plate current
12 mA
Published table
Characteristic
Transconductance
14000 µS
Published table
Heater voltage
6.3 V
Published heater rating
Heater current
170 mA
Published heater rating