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ECC40 — Small Signal Triode, Rimlock | Tubeofile
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ECC40
Small Signal Triode — Rimlock
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Philips
↗ TDSL
↗ Radiomuseum
Known Equivalents & Substitutes
CV3884
AA61
Similar Tubes (Not Drop-In Compatible)
6SN7GT
Medium-mu dual triode (mu=20) on Octal base; listed as predecessor by Philips, similar application as LF amplifier/phase inverter
ECC82
Medium-mu dual triode (mu=17) on Noval base; Philips successor to ECC40, lower mu but similar circuit roles
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
Max Anode Voltage
300
V
Anode Dissipation (max)
Max Anode Dissipation
1.5
W
Cathode Current (max)
Max Cathode Current
10
mA
Heater-to-Cathode Voltage (max)
Max Heater-Cathode Voltage
175
V
Max Grid Resistor
Max Grid Resistor
1
MΩ
Typical Operating
Anode Voltage (typical)
Anode Voltage
250
V
Grid 1 Bias Voltage
Grid Voltage
-5.6
V
Anode Current
Anode Current
6
mA
Anode Resistance
Internal Resistance
11,000
Ω
Transconductance
Mutual Conductance
Capacitances
Grid-to-Plate Capacitance
Grid-Anode Capacitance
2.7
pF
Input Capacitance
Input Capacitance
2.8
pF
Output Capacitance
Output Capacitance
1.1
pF
Heater
Heater Voltage
Heater Voltage
6.3
V
Heater Current
Heater Current
0.6
A
Notes
Philips Rimlock-era design introduced in 1948, superseded by ECC82 on Noval base from 1951.
Two identical triode sections with completely separate cathodes; heaters connected in parallel internally.
Maximum heater-cathode voltage is 175V (heater negative) or 100V (heater positive), notably higher than typical E-series valves.
Can be used without special microphony precautions when input voltage is at least 5 mV for output of 50 mW.
Each section heater draws 0.3A; total heater current is 0.6A at 6.3V.
Pin Layout — Rimlock
1
2
3
4
5
6
7
8
1
Anode 1 (Triode section 1)
2
Anode 2 (Triode section 2)
3
Control Grid 1 (Triode section 1)
References
https://frank.pocnet.net/sheets/030/e/ECC40.pdf
https://frank.pocnet.net/sheets/046/e/ECC40.pdf
2.9
mA/V
Amplification Factor (μ)
Amplification Factor
32
—
Cathode Resistor (self-bias)
Cathode Resistor (self-bias)
920
Ω
4
Cathode 1 (Triode section 1)
5
Heater
6
Control Grid 2 (Triode section 2)
7
Cathode 2 (Triode section 2)
8
Heater