EBF80
RFT DOUBLE DIODE-PENTODE RF/IF STAGE
TUBE = 6N8 ZD152 WD709
The EBF80 is a variable 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.
Brand: RFT Tube type: Double Diode-Pentode RF/IF-Stage Controlling (mu) Identical to: EBF80 = 6N8 = ZD152 = WD709 Similar Tubes Heater different: 12N8 ; UBF80 The thin glass tube envelope is 20mm in diameter and, excluding the B9A base pins, is 59mm tall. Weight ~ 15 g Pack 1 Pcs.