Data set 01
1938 Raytheon Amateur
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
RFOutputPower
22 W
Power - Pentode (NOT beam) ·Pentode
RK25
Raytheon transmitting pentode designed for RF power and suppressor-grid modulation service. Manufacturer tables provide transmitting electrode voltages, currents, dissipation, power, and capacitance data.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 7-Pin
- Socket code
- MEDIUM7
- Base pins
- 7
- Nominal heater
- 6.3 V / 1 A
Description
Raytheon transmitting tube rated for r-f pentode suppressor modulator. Published table values include electrode voltages/currents, dissipation, power, and capacitances where shown.
Socket description
Medium 7-contact transmitting-tube base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 7-Pin
- Socket code
- MEDIUM7
- Base pins
- 7
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 1 A
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
7-Pin - Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
1 physical section, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Max plate voltage
- 500 V
- Max screen voltage
- 250 V
- Max plate dissipation
- 10 W
- Max screen dissipation
- 8 W
Published ratings and characteristics promoted from the approved Raytheon source.
Source-dependent data
Operating conditions by source
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 02
195X Raytheon Special Purpose Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Grid 1 voltage
-90 V
Grid 3 voltage
45 V
Maximum plate current
55 mA
Maximum grid 1 current
8 mA
Maximum grid 2 current
38 mA
Drive power
0.5 W
Output power
22 W
Capacitance
Grid-to-plate capacitance
0.2 pF
Input capacitance
10 pF
Output capacitance
10 pF
Data set 03
1963 Siemens
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Frequency
4.2 GHz
Resonator voltage
310 V
Resonator current
38 mA
Power output
180 mW
Characteristics
Tuning range
3.6-4.5 GHz