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6CL6
Power Pentode — Noval
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RCA
Data: Medium
Medium quality — at least 60% of universal parameters and pins are present, but some key data is missing. Verify specific values against datasheets before critical use.
↗ TDSL
↗ Radiomuseum
Known Equivalents & Substitutes
6677
6197
Similar Tubes (Not Drop-In Compatible)
6AG7
Similar power pentode but Octal base — not pin-compatible
6CH6
Similar power pentode on Noval base but higher gm and different pinout — not a drop-in
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
300
V
Screen Voltage (max)
Screen Voltage (max)
150
V
Anode Dissipation (max)
Anode Dissipation (max)
7.5
W
Heater-to-Cathode Voltage (max)
Heater-to-Cathode Voltage (max)
100
V
Typical Operating
Notes
GE Essential Characteristics: Pa_max 7.5 W, Va_max 300 V, Vs_max 150 V, Va(typ) 250 V, Vs(typ) 150 V, Vg=-3V, Ia=30mA, gm=7000, Rp=150000, Pout=2.8W.
6677 is the same tube under its RETMA registered number; 6197 is another alternate designation.
Sams substitution guide lists 2014 and 12G-K17 as substitutes.
Brans Vademecum lists 6677(/6CL6) as equivalent.
Used in television video output stages and as a driver in audio amplifiers.
Pin Layout — Noval
1
2
3
4
5
6
7
8
9
1
Internal Connection
2
Anode
3
No Connection
References
https://frank.pocnet.net/sheets/127/6/6CL6.pdf
https://tdsl.duncanamps.com/show.php?des=6CL6
Anode Voltage (typical)
Anode Voltage (typical)
250
V
Screen Voltage (typical)
Screen Voltage (typical)
150
V
Grid 1 Bias Voltage
Grid 1 Bias Voltage
-3
V
Anode Current
Anode Current
30
mA
Anode Resistance
Anode Resistance
150,000
Ω
Transconductance
Transconductance
7
mA/V
Output
Output Power
Output Power
2.8
W
Heater
Heater Voltage
Heater Voltage
6.3
V
Heater Current
Heater Current
0.65
A
4
Heater
5
Heater
6
Screen Grid (g2)
7
Suppressor Grid (g3)
8
Cathode
9
Control Grid (g1)