ECC99 — Small Signal Triode, Noval | Tubeofile

ECC99

Small Signal Triode — Noval

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JJ Electronic

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Known Equivalents & Substitutes

No known equivalents. If you know of any, use the ⚑ Report Issue button above.

Similar Tubes (Not Drop-In Compatible)

5687

High-current double triode (mu=17.5, ra=2.4kΩ, Pa=3.75W) on Noval base — similar driver application but lower dissipation and different operating point

6BX7GT

High-current Octal twin triode (mu=10, Pa=6W) — similar driver application but Octal base, not Noval

6N6P

Soviet double triode on Noval base, similar high-current driver application — different electrical parameters

E182CC

Philips/Mullard high-dissipation double triode with Noval base (mu=21, ra=2.65kΩ, Pa=4.5W) — similar application as power driver but different electricals

ECC88

Noval double triode with same pinout but much lower dissipation (1.5W) and different characteristics (mu=33, ra=2.6kΩ)

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)200V

Anode Dissipation (max)Anode Dissipation (max, per section)5W

Cathode Current (max)Cathode Current (max, per section)60mA

Heater-to-Cathode Voltage (max)Heater-to-Cathode Voltage (max)100V

Typical Operating

Notes

The ECC99 is a modern tube with no historical equivalent — it was designed by JJ Electronic specifically as a high-dissipation driver tube. There are no pin-for-pin drop-in equivalents from other manufacturers.
With 5W per section plate dissipation and 200V max plate voltage, it can deliver substantial current making it suitable as a driver for power triodes like 300B and 2A3.
Also used as an output tube in headphone amplifiers and small single-ended power amplifiers delivering up to approximately 1W.
Standard Noval (B9A) pinout identical to ECC82/ECC83/ECC88 family: pin 1=anode 1, pin 2=grid 1, pin 3=cathode 1, pin 6=anode 2, pin 7=grid 2, pin 8=cathode 2, pins 4+5=heater, pin 9=centre tap/shield.
Max heater-to-cathode voltage is 100V. Heater can be operated on AC or DC.

Pin Layout — Noval

1Anode (section 1)

2Grid (section 1)

3Cathode (section 1)

References