Noval double triode for VHF/FM tuners but different characteristics (mu=58, gm=6.2 mA/V) and different pinout — not pin-compatible
PCC88
Series-string version with 7V/0.3A heater — identical characteristics otherwise but not a drop-in replacement due to different heater voltage
Electrical Specifications
Absolute Maximum
Anode Voltage (max)Anode Voltage (max)130V
Anode Dissipation (max)Anode Dissipation (max per section)1.8W
Cathode Current (max)Cathode Current (max per section)25mA
Heater-to-Cathode Voltage (max)Heater-to-Cathode Voltage (max)150V
Notes
The ECC88/6DJ8 is the standard commercial version. The 6922/E88CC is the special-quality long-life version with tighter tolerances and 10,000-hour rated life.
7308/E188CC is an even higher reliability grade — can substitute for ECC88 but not vice versa in critical applications.
CCa is the Telefunken premium-grade designation for the E88CC/6922.
Not for storage battery supply — indirect heating only (AC or DC, parallel supply).
Max anode voltage is only 130V (DC component) — much lower than conventional dual triodes like ECC81 (300V) or ECC82 (300V). This is a low-voltage tube.
In cascode operation, the anode voltage across the grounded-cathode section should not exceed 75V in the uncontrolled condition.
Fixed grid bias is only permitted when Ia <= 5 mA. For normal operating currents, cathode bias (self-bias) is required.
Max Pa is 1.8 W per section, but Ik max is 25 mA per section.
Pin 9 is an internal shield between the two triode sections.
Pin Layout — Noval
1Anode (triode 2)
2Grid (triode 2)
3Cathode (triode 2)
Socket-Compatible Tubes ⚠ Not electrically compatible