Data set 01
1959 Rogers
Published operating points and test conditions from this source.
SECTION 1
Diode
Application
Application
Detector / AGC
SECTION 3
Pentode
Application
Application
IF amplifier
Voltage Pentode or Tetrode (with diode) ·Diode-Diode-Pentode
6DR8
Double-diode pentode designed for IF amplification, detection, and automatic gain control in automobile radio receivers.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 3
- Base
- -
- Socket code
- B9A
- Base pins
- -
- Nominal heater
- 6.3 V / 300 mA
Description
Double-diode pentode for IF amplification, detection, and automatic gain control in car radios.
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
- -
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 300 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
3 physical sections, each with unique specifications.
Section 1
Diode
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
First of two physical diodes in Rogers 6DR8 indirectly heated double-diode pentode for storage-battery car radios; used for signal detection and automatic gain control. Both diode plate-to-cathode capacitances about 2.5 pF, mutual diode plate coupling maximum 0.25 pF. Diode plate 1 to pentode control grid maximum 0.0008 pF and to pentode plate maximum 0.15 pF. Manufacturer nine-pin E9-1 basing 9HE; first diode plate at pin 7, second at pin 8. No diode forward-current or peak-inverse maxima inferred from the pentode ratings.
Section 2
Diode
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
Second distinct physical diode in Rogers 6DR8 double-diode pentode for automotive detection and AVC. Diode plate 2 at pin 8, first diode plate at pin 7. Each diode plate-to-cathode capacitance 2.5 pF; mutual diode-plate coupling max 0.25 pF; second diode plate-to-pentode grid-1 max 0.001 pF and to pentode anode max 0.025 pF. Independent diode section retained; no unsupported diode current maxima promoted.
Section 3
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 200000 Ω
- Transconductance
- 0.0021 S
- Max plate voltage
- 50 V
- Max screen voltage
- 50 V
Rogers 6DR8 pentode IF amplifier section of a double-diode pentode for storage-battery automobile radios; 6.3 V 0.3 A heater, 9HE nine-pin basing. Manufacturer design-center plate and grid-2 maximum each 50 V, cathode current 6.3 mA maximum, with various circuit-level current conditions. Typical operating point at Va=Vg2=25 V, g3 at 0 V: anode current 1.7 mA, screen current 0.5 mA, transconductance 2100 µmhos (0.0021 S), plate resistance approximately 0.2 MΩ (200 kΩ). Alternate Va=Vg2=12.6 V: Ia about 0.45 mA, Ig2 0.14 mA, gm 1000 µmhos and rp about 1 MΩ. Grid-1 bias developed from grid current with 2.2 MΩ return resistor. Published interelectrode and cross-diode coupling capacitances; do not confuse typical plate/screen voltages with 50 V maxima.
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.