Quick Details

• Place of Origin: Liaoning, China (Mainland)
• Brand Name: LIght of Torch
• Model Number: 845
• material: glass metal
• weight: 0.5

Packaging & Delivery

Specifications

Audio frequency power amplifier , Modulator

General Characteristics

Filament Voltage                                                                                      10

Filament Current (amps)                                                                          3.25

Amplification Factor                                                                                  5.3

Grid to Plate Transconductance@ 100 ma. ( micromhos)                        3400

Direct Interelectrode Capacitances:

Grid to Plate                                                                                              11.5

Grid to Filament                                                                                         5

Plate to Filamen                                                                                        3.5

MAXIMUM RATING AND TYPICAL OPERATING CONDITIONS

   A.F. Power Amplifier and Modulator--- Class A ( typical operation One tube)

A.C. Filament Voltage                                                         10

D.C.Plate Voltage                                                                1000

D.C.Grid Voltage                                                                -155

Peak A.F. Grid Voltage                                                        150

D.C Plate Current ( ma.)                                                     65

Plate Dissipation ( watts)                                                   65

Load Resistance( ohms)                                                   9000

Power output ( watts)                                                          21

Distortion ( % Sencond Harmaonic)                                5

  A.F. Power Amplifier and Modulator--- Class AB( typical operation Two tubes)

A.C. Filament Voltage                                                         10                                 10

D.C.Plate Voltage                                                                1000                             1250

D.C.Grid Voltage(Approx)                                                 -175                               -225

Load Resistance ( hhms per tube)                                 1150                              2200

Effective Load Resistance ( plate to plate) (ohms)       4600                             8800

Zero Signal Plate Current( ma.)                                        40                                  40

Peak A.F. Grid to Grid Voltage( Approx.)                           340                               440

Max. Signal D.C. Plate Current( ma.)                                220                                200

Max. Signal Plate Input ( watts)                                          220                                250

Max. Signal Power output ( watts)                                     75                                   105