Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Diode
Characteristics
Diode plate voltage at 50 mA
10 V
SECTION 2
Pentode
Application
Primary application
Final IF amplifier
Voltage Pentode or Tetrode (with diode) ·Diode-Pentode
6AM8A
High-perveance diode and sharp-cutoff pentode for television IF amplification, video detection, AGC, and DC-restorer service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- 9CY
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 6.3 V / 450 mA
Description
Combination high-perveance diode and sharp-cutoff pentode for television IF, video, AGC, detector, and DC-restorer service.
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
- 9CY
- Socket code
- B9A
- Base pins
- 9
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 450 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
9CY - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN11K | A | K — Cathode Original EIA label 1K; manufacturer corroboration pending | Unverified EIA Base Connections, printed page 131, 9CY |
| PIN21G1 | A | G1 — Control Grid Original EIA label 1G1; manufacturer corroboration pending | Unverified EIA Base Connections, printed page 131, 9CY |
| PIN31G2 | A | G2 — Screen Grid Original EIA label 1G2; manufacturer corroboration pending | Unverified EIA Base Connections, printed page 131, 9CY |
| PIN4H | — | H — Heater Original EIA label H; manufacturer corroboration pending | Unverified EIA Base Connections, printed page 131, 9CY |
| PIN5H | — | H — Heater Original EIA label H; manufacturer corroboration pending | Unverified EIA Base Connections, printed page 131, 9CY |
| PIN61P | A | P — Plate (Anode) Original EIA label 1P; manufacturer corroboration pending | Unverified EIA Base Connections, printed page 131, 9CY |
| PIN72K | B | K — Cathode Original EIA label 2K; manufacturer corroboration pending | Unverified EIA Base Connections, printed page 131, 9CY |
| PIN82P | B | P — Plate (Anode) Original EIA label 2P; manufacturer corroboration pending | Unverified EIA Base Connections, printed page 131, 9CY |
| PIN91G3 | A | G3 — Suppressor Grid Original EIA label 1G3; manufacturer corroboration pending | Unverified EIA Base Connections, printed page 131, 9CY |
Section ratings
2 physical sections, each with unique specifications.
Section 1
Diode
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
Detector diode section.
Section 2
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 300000 Ω
- Transconductance
- 0.0078 S
- Max plate voltage
- 330 V
- Max screen voltage
- 330 V
- Max plate dissipation
- 3.2 W
- Max screen dissipation
- 0.55 W
Video-amplifier 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
Diode
Other
MaximumDiodeCurrentContinuous
4 mA
SECTION 2
Pentode
Other
Heater Warmup Time
11 s
Data set 03
1966 Tung Sol Electronic Tubes 1 of 4
Published operating points and test conditions from this source.
SECTION 1
Diode
Capacitance
Diode input capacitance
2.3 pF
Section2
Cathode capacitance
3 pF
Section2
Characteristic
Diode plate voltage at 50 mA
30 V
Section2
Other
Application
Video detector diode
Section2
SECTION 2
Pentode
Capacitance
Grid-to-plate capacitance maximum
0.015 pF
Section1
Input capacitance
6 pF
WithShield
Output capacitance
3 pF
WithShield
Other
Plate voltage
125 V
VideoIF
Screen voltage
125 V
VideoIF
Cathode resistor
56 Ω
VideoIF
Plate current
12.5 mA
VideoIF
Screen current
3.2 mA
VideoIF
Characteristic
Transconductance
9000 µS
Section1
Plate resistance
0.3 MΩ
Section1
Data set 04
1971 RCA HB3 Binder 4 of 7
Published operating points and test conditions from this source.
SECTION 1
Diode
Other
Heater voltage nominal
6.3 V
Heater current
450 mA
Maximum DC plate current
5 mA
Characteristics
Heater warm-up time
11 s
Average
Capacitance
Plate-to-cathode-and-heater capacitance
1.8 pF
Cathode-to-plate-and-heater capacitance
3 pF
SECTION 2
Pentode
Other
Heater voltage nominal
6.3 V
Heater current
450 mA
Maximum plate voltage
330 V
ClassA1
Maximum screen supply voltage
330 V
ClassA1
Maximum screen input
0.55 W
ClassA1
Maximum plate dissipation
3.2 W
ClassA1
Characteristics
Heater warm-up time
11 s
Average
Plate supply voltage
125 V
ClassA1
Screen supply voltage
125 V
ClassA1
Cathode resistor
56 ohm
ClassA1
Plate resistance
300000 ohm
ClassA1
Transconductance
7800 µS
ClassA1
Plate current
12.5 mA
ClassA1
Screen current
3.2 mA
ClassA1
Data set 05
1975 RCA RC30
Published operating points and test conditions from this source.
SECTION 1
Diode
Other
Heater Voltage (ac/dc) 4.7
6.3 V
Published in approved 6AM8A target entry; Section1
Heater Current 0.6
450 mA
Published in approved 6AM8A target entry; Section1
Plate Voltage
330 V
Published in approved 6AM8A target entry; Section1
Grid-No.3 (Suppressor-Grid) Voltage, Positive value
0 V
Published in approved 6AM8A target entry; Section1
Grid-No.2 (Screen-Grid) Supply Voltage
330 V
Published in approved 6AM8A target entry; Section1
Grid-No.l (Control-Grid) Voltage, Positive-bias value
0 V
Published in approved 6AM8A target entry; Section1
Plate Dissipation
3.2 W
Published in approved 6AM8A target entry; Section1
For grid-No. 2 voltages up to
165 V
Published in approved 6AM8A target entry; Section1
For grid-No. 2 voltages up to 165 volts
0.55 W
Published in approved 6AM8A target entry; Section1
For grid-No. 2 voltages between 165 and
330 V
Published in approved 6AM8A target entry; Section1
Plate Supply Voltage
125 V
Published in approved 6AM8A target entry; Section1
Grid-No.2 Supply Voltage
125 V
Published in approved 6AM8A target entry; Section1
For fixed-bias operation
0.25 MΩ
Published in approved 6AM8A target entry; Section1
For cathode-bias operation
1 MΩ
Published in approved 6AM8A target entry; Section1
GRID -No
2 V
Published in approved 6AM8A target entry; Section1
Heater Current O.G
450 mA
Published in approved 6AM8A target entry; Section1
Heater Warm-up Time (Average) 11
11 seconds
Published in approved 6AM8A target entry; Section1
Capacitance
Plate to Cathode and Heater
1.8 pF
Published in approved 6AM8A target entry; Section1
Cathode to Plate and Heater
3 pF
Published in approved 6AM8A target entry; Section1
Grid No.l to Plate
0.015 pF
Published in approved 6AM8A target entry; Section1
Internal Shield
6.5 pF
Published in approved 6AM8A target entry; Section1
Internal Shield
2.6 pF
Published in approved 6AM8A target entry; Section1
Pentode Grid No.l to Diode Plate
0.006 pF
Published in approved 6AM8A target entry; Section1
Pentode Plate to Diode Cathode
0.15 pF
Published in approved 6AM8A target entry; Section1
Pentode Plate to Diode Piate
0.1 pF
Published in approved 6AM8A target entry; Section1
Grid to Cathode and Heater
2 pF
Published in approved 6AM8A target entry; Section1
Plate to Cathode and Heater
0.26 pF
Published in approved 6AM8A target entry; Section1
Characteristic
Cathode-Bias Resistor
56 Ω
Published in approved 6AM8A target entry; Section1
Plate Resistance (Approx.)
0.3 MΩ
Published in approved 6AM8A target entry; Section1
Plate Current
12.5 mA
Published in approved 6AM8A target entry; Section1
Grid-No.2 Current
3.2 mA
Published in approved 6AM8A target entry; Section1
Grid-No.l Voltage (Approx.) for plate current of 20 fJ.A
6 V
Published in approved 6AM8A target entry; Section1
Grid-No.l Voltage (Approx.) for plate current of
2 mA
Published in approved 6AM8A target entry; Section1
Grid-No.l Voltage (Approx.) for plate current of 2 mA
3 V
Published in approved 6AM8A target entry; Section1
SECTION 2
Pentode
Other
Heater Voltage (ac/dc) 4.7
6.3 V
Published in approved 6AM8A target entry; Section2
Heater Current 0.6
450 mA
Published in approved 6AM8A target entry; Section2
Plate Voltage
330 V
Published in approved 6AM8A target entry; Section2
Grid-No.3 (Suppressor-Grid) Voltage, Positive value
0 V
Published in approved 6AM8A target entry; Section2
Grid-No.2 (Screen-Grid) Supply Voltage
330 V
Published in approved 6AM8A target entry; Section2
Grid-No.l (Control-Grid) Voltage, Positive-bias value
0 V
Published in approved 6AM8A target entry; Section2
Plate Dissipation
3.2 W
Published in approved 6AM8A target entry; Section2
For grid-No. 2 voltages up to
165 V
Published in approved 6AM8A target entry; Section2
For grid-No. 2 voltages up to 165 volts
0.55 W
Published in approved 6AM8A target entry; Section2
For grid-No. 2 voltages between 165 and
330 V
Published in approved 6AM8A target entry; Section2
Plate Supply Voltage
125 V
Published in approved 6AM8A target entry; Section2
Grid-No.2 Supply Voltage
125 V
Published in approved 6AM8A target entry; Section2
For fixed-bias operation
0.25 MΩ
Published in approved 6AM8A target entry; Section2
For cathode-bias operation
1 MΩ
Published in approved 6AM8A target entry; Section2
GRID -No
2 V
Published in approved 6AM8A target entry; Section2
Heater Current O.G
450 mA
Published in approved 6AM8A target entry; Section2
Heater Warm-up Time (Average) 11
11 seconds
Published in approved 6AM8A target entry; Section2
Capacitance
Plate to Cathode and Heater
1.8 pF
Published in approved 6AM8A target entry; Section2
Cathode to Plate and Heater
3 pF
Published in approved 6AM8A target entry; Section2
Grid No.l to Plate
0.015 pF
Published in approved 6AM8A target entry; Section2
Internal Shield
6.5 pF
Published in approved 6AM8A target entry; Section2
Internal Shield
2.6 pF
Published in approved 6AM8A target entry; Section2
Pentode Grid No.l to Diode Plate
0.006 pF
Published in approved 6AM8A target entry; Section2
Pentode Plate to Diode Cathode
0.15 pF
Published in approved 6AM8A target entry; Section2
Pentode Plate to Diode Piate
0.1 pF
Published in approved 6AM8A target entry; Section2
Grid to Cathode and Heater
2 pF
Published in approved 6AM8A target entry; Section2
Plate to Cathode and Heater
0.26 pF
Published in approved 6AM8A target entry; Section2
Characteristic
Cathode-Bias Resistor
56 Ω
Published in approved 6AM8A target entry; Section2
Plate Resistance (Approx.)
0.3 MΩ
Published in approved 6AM8A target entry; Section2
Plate Current
12.5 mA
Published in approved 6AM8A target entry; Section2
Grid-No.2 Current
3.2 mA
Published in approved 6AM8A target entry; Section2
Grid-No.l Voltage (Approx.) for plate current of 20 fJ.A
6 V
Published in approved 6AM8A target entry; Section2
Grid-No.l Voltage (Approx.) for plate current of
2 mA
Published in approved 6AM8A target entry; Section2
Grid-No.l Voltage (Approx.) for plate current of 2 mA
3 V
Published in approved 6AM8A target entry; Section2