ECC82 — Small Signal Triode, Noval | Tubeofile | Tubeofile

ECC82

Name: ECC82
Brand: Philips

Small Signal Triode — Noval — Philips

Data: HighHigh quality — base, heater, all universal parameters present, and ≥50% of desirable parameters filled in. Safe to use for design decisions.

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Known Equivalents & Substitutes

12AU712AU7A12AU7WAB329CV491CV4003CV10323CV10666CV8155CV8221M813658145814A596360676189668074897730E2163E82CCB7496AU7 ECC802S

Similar Tubes (Not Drop-In Compatible)

6SN7

Medium-mu dual triode (mu=20) but Octal base; similar electrical characteristics, widely used in audio

ECC40

Earlier Rimlock dual triode (mu=30); higher mu and gain but different base — predecessor in Philips numbering

ECC81

Same Noval dual triode pinout but higher mu (mu=60); lower plate current, higher ra — European designation for 12AT7

ECC83

Same Noval dual triode pinout but high-mu (mu=100); much lower plate current, used as voltage amplifier — European designation for 12AX7

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Max Anode Voltage300V

Peak Anode Voltage (max)Peak Anode Voltage (max)550V

Anode Dissipation (max)Max Anode Dissipation (each section)2.75W

Cathode Current (max)Max Cathode Current20mA

Heater-to-Cathode Voltage (max)

Notes

Philips/Mullard designation for the 12AU7 family, introduced in 1954. Electrically identical to the American 12AU7 but specified per Philips conventions.
Philips Rg_max is 1 MΩ (cathode bias), more conservative than the American 12AU7 spec of 2.2 MΩ. Circuit designers should use the Philips limit for reliability.
Philips specifies Vhk_max = 180V vs the American 12AU7 rating of 200V. Use the more conservative Philips figure.
At Va=100V, Vg=0V operating point: Ia=11.8mA, gm=3.1mA/V, mu=19.5, ra=6250 Ohm — useful for low-voltage designs.
With Vf applied to pins 4+5 and pin 9 center tap grounded, the section on pins 6, 7, 8 has lower hum pickup.
Can be operated with 6.3V or 12.6V heater supply. Series operation at 12.6V requires a current-limiting device in the heater circuit during switch-on.
The B329 is the Philips Miniwatt commercial designation for the same tube.

Pin Layout — Noval

1Anode 2 (Triode section 2)

2Control Grid 2 (Triode section 2)

Socket-Compatible Tubes ⚠ Not electrically compatible

12AT7 12AV7 12AX7 12AY7 12AZ7 12BH7 12CG7 5751 5965 6/30L2 6922 6BK7 6BQ7A 6CG7 6DJ8

References