TubeDatabase
  • Tubes
  • Testers
  • Companies
  • Submit
  • About

Tube Database (7,341 tube types · 1,270 archive entries)

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
DisclaimerSubmit a tube

Tube-number record

8CN7

0 archive entries

BrandTung-Sol
ClassDuplex-Diode High-Mu Triode
BaseNoval (B9A)
Filament8.4 V @ 225 mA

Construction

Primary TypeMulti-section
EnvelopeGlass
Base MaterialSmall Button (9EN)
Sections3

Filament / Heater

Warm-up Time11s
Heater NotesSeries or Parallel connection; Heater warm-up time applies to parallel connection only.

Absolute Maximum Ratings

Plate Voltage400 V
Plate Dissipation1 W
Cathode Current5 mA
H-C Voltage200 V

Audio Performance

Key Features
  • Coated Unipotential Cathode
  • Controlled heater warm-up time
  • Separate cathodes for diode and triode sections

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A1 Amplifier100 V130054000700.8 mA
Class A1 Amplifier250 V120058000701 mA

Application Notes

Intended for service as a combined horizontal phase detector and reactance tube in television receivers.

Filters

0 tubes found

Manufacturers

Brands

    0 results