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TECHNICAL DATA
TAD EF86 / 6267 Premium Select Low Noise AF Pentode
The TAD™ EF86 / 6267: is a glass envelope miniature pentode for highquality small signal amplification in sensitive input stages The TAD™ EF86 / 6267 is likewise suitable for many High-End-Audio devices and microphone preamps as well as the famous VOX AC amplifier line from the early 60´s. The TAD™ EF86 / 6267 is a faithful reproduction in shape and tone of yesteryears EF86´s.
Characteristics of a bogey tube:
Electrical Heater Voltage (AC or DC) in Volts Heater Current in mA
Heating Cathode-to-heater potential, max. Cathode positive: Cathode negative: Direct interelectrode capacitances, max.***
Grid 1 to all except plate Grid 1 to plate Plate to all except Grid 1 Grid 1 to heater Mechanical Operating Position Base Dimensions: Height Seated height Diameter Cooling Approximate net weight ***Without external shielding, nominal values
AF Power Amplifier Maximum ratings DC plate voltage Grid 2 voltage Positive DC Grid Voltage Negative DC Grid Voltage Plate dissipation Grid 2 Dissipation Bulb temperature (surface hottest point) Cathode Current
6.3+/-0.5 200+/- 10%
Indirect
100 V 50V
3.8 pF 0.05 pF
5.1 pF 0.0025 pF
Any E9-1, Small Button 9 Pin
55.6 mm 49.2 mm 22.2 mm conventional
15 g
300 V 200 V
0V -100 V 1.0 W 0.2 W 170°C
6 mA
RT-EF86/6267 Pentode Connection
B+ / V RA / kΩ RG2 / kΩ RK / kΩ VOut / VRMS VOut / VIN THD / % IA / mA
200 100 390 1,00 40,3 100,8 4,0 1,5 250 100 390 1,00 43,7 109,3 2,8 1,9 300 100 390 1,00 46,4 116,0 2,3 2,4 350 100 390 1,00 48,6 121,5 2,0 2,8 400 100 390 1,00 50,6 126,5 1,8 3,3
200 220 1000 2,20 50,3 125,8 8,0 0,7 250 220 1000 2,20 57,0 142,5 6,5 0,9 300 220 1000 2,20 61,4 153,5 5,5 1,1 350 220 1000 2,20 65,3 163,3 5,0 1,3 400 220 1000 2,20 68,4 171,0 4,5 1,5
RT-EF86/6267 Triode Connection (G2 to Anode, G3 to Cathode)
B+ / V RA / kΩ
200 100 250 100 300 100 350 100 400 100
RK / kΩ VOut / VRMS VOut / VIN THD / % IA / mA
2,20 10,9 27,3 0,83 1,0 2,20 11,0 27,5 0,64 1,2 2,20 11,2 28,0 0,52 1,5 2,20 11,3 28,3 0,44 1,7 2,20 11,4 28,5 0,41 2,0
200 220 250 220 300 220 350 220 400 220
3,90 3,90 3,90 3,90 3,90
Test arrangement:
11,6 29,0 1,00 0,5 11,7 29,3 0,80 0,6 11,8 29,5 0,60 0,8 11,9 29,8 0,50 0,9 12,0 30,0 0,40 1,0
Bottom View
Octal Base Connections
Outline View
Version 1.0 17.10.2012
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