Data set 01
1960 Mazda
Published operating points and test conditions from this source.
SECTION 1
Pentode
Capacitance
Anode-earth capacitance
5 pF
Grid-earth capacitance
10.75 pF
Anode-grid capacitance
0.003 pF
Voltage Pentode - Sharp Cutoff (single) ·Pentode
SP181
High-frequency receiving pentode designed for RF amplification, including short-wave or VHF service according to type.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- IO
- Base pins
- 8
- Nominal heater
- 18 V / 200 mA
Description
Screened high-frequency pentode for the H.F. stages of short-wave AC/DC receivers, with a metallised bulb and Mazda octal base.
Socket description
International Octal
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- IO
- Base pins
- 8
- Nominal heater voltage
- 18 V
- Nominal heater current
- 200 mA
- 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
1 physical section, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0085 S
- Max plate voltage
- 250 V
- Max screen voltage
- 250 V
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.