Quantity in Stock
11
Location
Box E.1
The EBF80 is a variable μ amplifier pentode and a pair of signal diodes in the one envelope.
Probably this was designed as the later EBF89 as final IF amplifier and AM detector.
The other diode would provide AGC rectification.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 58 mm tall.
References: Datasheet, 3002 & 1040. Type EBF80 was first introduced in 1950.
Pin 1: Grid Number 2
Pin 2: Grid Number 1
Pin 3: Cathode, Internal Shield
Pin 4: Heater
Pin 5: Heater
Pin 6: Anode
Pin 7: Anode (d1)
Pin 8: Anode (d2)
Pin 9: Grid Number 3
Specifications
Vf : 6.3v
If : 300mA
Va : 250v
mAa : 9mA
Cak : 4.9pF
Cga : 0.025pF
Cgk : 4.9pF
Vg2 : 85v
Vg1 : -2.0v
Ia : 5.0mA
Ig2 : 1.75mA
Ra : 1.5MΩ
S : 2.2mA/v
Substitutes
6N8
WD709
ZD152
Datasheets
Thanks to the Valve Museum for the information collected here.