The E283CC is a special quality audio double triode. It is a development of the ECC83 but with a different pin layout. The amplification factor (mu) is, like the ECC83, 100. The data sheet makes it clear that for maximum life the heater voltage should remain within 5% of the 6.3 nominal value.
The transposition of the letters and numbers was the Mullard way of designating a special quality product.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 46 mm tall.
References: Data-sheet & 3002. Type E283CC was first introduced in 1959.
Absolute Maximum Operating Conditions¶
Updated January 31, 2013. shape:thin.glass.tube construction:all.glass type:double.triode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.k pin:2.g1 pin:3.a pin:4.h pin:5.h pin:6.k pin:7.s pin:8.a pin:9.g1