Data set 01
1956 RCA Transmitting Tubes
Published operating points and test conditions from this source.
SECTION 1
Triode
Application
Application
Industrial control amplifier / voltage regulator
Power - Triode ·Triode-Triode
3C33
Twin high-perveance power triode developed for industrial control-amplifier and voltage-regulator service, combining two power sections suited to substantial current handling and series-pass regulation.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- SEPTAR7
- Base pins
- -
- Nominal heater
- 12.6 V / 1.125 A
Description
Twin high-perveance power triode for industrial control-amplifier and voltage-regulator service.
Socket description
Septar 7-contact base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- SEPTAR7
- Base pins
- -
- Nominal heater voltage
- 12.6 V
- Nominal heater current
- 1.125 A
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
2 physical sections, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Amplification factor
- 11
- Max plate dissipation
- 15 W
Two identical triode units; represented once under identical-section compression.
Section 2
Triode
X-ray radiationInterelectrode capacitances
- Amplification factor
- 11
- Max plate dissipation
- 15 W
Identical second physical section; duplicated from representative section per physical-section-row policy.
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.