Henry Radio 3K Classic Mark II Operating And Maintenance Manual page 35

SECTION 10.
TUBE SPECIFICATIONS
The EIMAC 3CX1200A7 is a high mu, compact, forced-air cooled,
rugged, ceramic/metal power triode, intended to be used as a
zero-bias Class AB2 amplifier. Grounded grid operation is also
attractive since a power gain as high as twenty times can be
obtained in a cathode-driven circuit.
GENERAL CHARACTERISTICS'll
ELECTRICAL
Filament: Thoriated Tungsten
1j I
Voltage ......................................................................................
7 5 Volts ' 0.37 V
Current .......... .......................................................................................... 21.3
Frequency for Maximum Ratings ................................................ ..... . ... .. . .. ... .... 110 MHz
Amplification Factor ....................................................................................... 200
Interelectrode Capacitances (grounded filament connection)?
Input ..................................................................................................... 20 pF
Output (max) .... ........................................................................................
06 pF
Feedback .............................................................................................. 10.3 pF
Interelectrode Capacitances ( grounded grid connection)2
Input ..................................................................................................... 20 pF
Output ................................................................................................. 10.3 pF
Feedback (max) ......................................................................................... 0.6 pF
MECHANICAL
Cooling ................................................................................................ Forced Air
Maximum Operating Temperatures
Plate Seal .............................................................................................. 250"C
Base Seal ............................................................................................... 250'C
Mounting Position ............................... ......... .... ........... ... ....... Vertical, Base Up or Down
Socket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SK410
Chimney ................................................................................................
SK436
Maximum Length .......... ....................................................................... 6.0 in.. 147 mm
Maximum Diameter ............................................................................. 2.91 in: 73.1 mm
Weight (Approximate) ...............................................................................
2 b lb: 1.1 kg
Charar.tonsl.cs and operating values are based upon performance tests These figures may change without nut:ee as the rt"SLI11 of additional
data or product refinement Varian EIMAC should be consulted before using this information for finai equipme•rl drsign
° Capacitance values are for a cold tube as measured in a special shielded fixture in accordance with EOranrrrt: IndusLrir-N /1ssorr,jtior
Standard RS 191
i6