E283CC

E283CC has no equivalent designation confirmed by the archive.

Description

The E283CC is a hum-free and microphony-free low-noise double triode with separate cathodes. It is a special version of the ECC83 but with a different base connection. The tube has a Noval base and weighs about 11 g. Its envelope conforms to DIN 41539, form A, nominal size 40. The E283CC can be installed in any position.

Construction

The E283CC features a special cathode free of interface layers and has high resistance to shock and vibration. It offers tight tolerances. The heater is indirect, operated by AC or DC with parallel supply. Heater voltage Uf is 6.3 V and heater current If is 330 ± 17 mA.

Ratings

Maximum ratings include an anode voltage Uao of 600 V, anode voltage Ua of 330 V, anode dissipation Qa of 1.2 W, negative grid voltage -Ug of 55 V, positive grid voltage +Ug of 0.5 V, cathode current Ik of 9 mA, voltage between heater and cathode vfk of 200 V, resistance between heater and cathode Rfk of 20 kΩ, and bulb temperature tkolb of 170 °C. Maximum grid resistance Rg is 2.2 MΩ for fixed grid bias, 25 MΩ for automatic grid bias, and 1.2 MΩ when bias is provided by Rg. When used as a phase inverter directly before the output stage, the maximum resistance between heater and cathode Rfk is 135 kΩ.

Characteristics

The amplification factor μ is 100. At Ua = 250 V and Rk = 1.6 kΩ, the anode current Ia is 1.1 to 1.4 mA with a nominal value of 1.25 mA; transconductance S is 1.3 to 1.95 mA/V with a nominal value of 1.6 mA/V; and internal resistance Ri is 62.5 kΩ nominal and 80 kΩ maximum. The grid voltage for Ia = 20 μA is -4.0 V. The difference between the grid voltage for Ia = 20 μA and the grid voltage at grid current +Ig = 0.3 μA is -1.0 V. The Siemens & Halske datasheet gives characteristic curves Ia = f(Ug), Ia = f(Ua), and S, μ, Ri = f(Ia).

Applications

The E283CC is particularly suited for AF voltage amplifiers, phase inverter stages, and measuring amplifiers. It has a long lifetime of more than 10000 hours, assuming the heater voltage does not deviate more than ± 5% (absolute limits) from the nominal value. The datasheet recommends using system I as the input system for lowest hum voltage. The screen connected to base pin 7 must be connected to chassis. The E283CC may be used without special anti-microphony measures in circuits which require an input voltage > 0.5 mV for an output power of 30 mW from the output tube.

Original manufacturer datasheets for E283CC, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• BRUMM- UND MIKROFONIEARME NF-DOPPELTRIODE