Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 2
Beam Power
Other
Power output
3 W
ClassA
Power - Beam (NOT sweep) ·BeamPower-Triode
50FY8
Combination voltage-amplifier triode and beam-power pentode designed for compact monaural and push-pull stereo audio amplifiers, integrating driver and output functions.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 50 V / 150 mA
Description
The 50FY8 combines a voltage-amplifier triode with a beam power pentode and was characterized for compact single-channel and push-pull stereo amplifier circuits.
Socket description
Small-button Noval 9-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater voltage
- 50 V
- Nominal heater current
- 150 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
2 physical sections, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 17000 Ω
- Transconductance
- 0.0027 S
- Amplification factor
- 46
- Max plate voltage
- 150 V
- Max plate dissipation
- 1 W
Triode section.
Section 2
Beam Power
X-ray radiationInterelectrode capacitances
- Plate resistance
- 5000 Ω
- Transconductance
- 0.0075 S
- Max plate voltage
- 150 V
- Max screen voltage
- 150 V
- Max plate dissipation
- 10 W
- Max screen dissipation
- 3 W
Beam-power pentode section.
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
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Heater voltage
50 V
Heater current
150 mA
Plate voltage
126 V
ClassA
Characteristic
Plate current
2.5 mA
ClassA
Amplification factor
46
ClassA
SECTION 2
Beam Power
Other
Plate voltage
126 V
ClassA
Screen voltage
125 V
ClassA
Power output at 10% distortion
3 W
ClassA
Characteristic
Zero-signal plate current
70 mA
ClassA
Maximum-signal plate current
66 mA
ClassA
Data set 03
1966 Tung Sol Electronic Tubes 3 of 4
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Typical plate voltage
125 V
ClassA
Typical plate current
2.5 mA
ClassA
Maximum plate voltage
150 V
PromotedValue
Maximum plate dissipation
1 W
PromotedValue
Characteristics
Plate resistance
17000 ohm
PromotedValue
Transconductance
0.0027 A/V
PromotedValue
Amplification factor
46
PromotedValue
SECTION 2
Beam Power
Other
Typical plate voltage
125 V
ClassA
Typical screen voltage
125 V
ClassA
Typical plate current
70 mA
ClassA
Power output at 10% distortion
3 W
ClassA
Push-pull stereo power output
6 W
PushPull
Maximum plate voltage
150 V
PromotedValue
Maximum screen voltage
150 V
PromotedValue
Maximum plate dissipation
10 W
PromotedValue
Maximum screen dissipation
3 W
PromotedValue
Characteristics
Plate resistance
5000 ohm
PromotedValue
Transconductance
0.0075 A/V
PromotedValue