Ulianovsk 6C33C Amp Triod Tube

20 pcs. for $18 each.

NOS tubes, made in USSR, items is new, old stock.
They consist of two triodes (A and B) in the same glass envelope. Cathodes, grids and plates are internally connected in parallel. The filaments are lead out separately for each triode.         
Name                                  6C33C
Type                                   Output triode
Application                         LFpower amplification
Cathode type &oxide,indirect heating
Envelope:    Hard glass casing
Mass:         <200 g 
Height:       <130 mm 
Diameter:  <  65 mm
Base          Septar7
Pin Electrode 
1  Heater Filament A - 1 
2  Heater Filament A - 2 
3  Cathode
4  Plate
5  Grid
6  Heater Filament B - 1 
7  Heater Filament B – 2

 

TYPICAL OPERATING DATA: 
FILAMENT CURRENT 
Serial heater connection – filament voltage 12.6V  (3.3 ± 0.3) A
Parallel heater connection – filament voltage 6.3V  (6.6 ± 0.6) A
TYPICAL OPERATION
Plate voltage 120 V
Cathode resistor for cathode bias  35 Ohms
Warm-up time to steady state  > 600 s1
Plate current  (550± 80) mA                                         
1     - Warm-up time to 90% emission < 120 s.  
2     - Older versions and 6C33C/6S33S (540 ± 90) mA.
ABSOLUTE MAXIMUM RATINGS: 
Exceeding these ratings will cause permanent damage and/or premature failure of the valve. The circuit design has to assure that these absolute maximum ratings are not exceeded under any circumstances (worst case component tolerances and aging, environmental conditions and mains voltage deviations). 
FILAMENT VOLTAGE: 
Serial connection of heater filaments   (11.3 ... 13.9) V 
Parallel connection of heater filaments   (5.7 ... 6.9) V 
PLATE VOLTAGE:
Dissipation > 30 W         250V
Dissipation < 30 W         450V
Zero Current at power-up                     600 V
NEGATIVE GRID VOLTAGE             (–0.5..-150) V 
GRID CIRCUIT RESISTANCE           200 kOhm
VOLTAGE BETWEEN CATHODE AND HEATER  ±  300 V
ENVELOPE TEMPERATURE (J):
Ambient J = 20° C                                260 °C
Ambient J = 100° C                              300 °C
Ambient J = 150° C                              320 °C
PLATE CURRENT:
One triode operating                            350 mA
Both triodes operating                          600 mA 
PLATE DISSIPATION:
One triode operating                            45 W 
Both triodes operating                         60