Data set 01
1959 Telefunken
Published operating points and test conditions from this source.
SECTION 1
Pentode
Application
Application
High-power AF output
Power - Pentode (NOT beam) ·Pentode
RES664D
Telefunken high-power screen-grid output pentode designed for audio-frequency amplification. Its power construction supports substantial low-frequency loudspeaker drive in receiver and amplifier output stages.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 4 V / 600 mA
Description
High-power screen-grid output pentode for audio-frequency amplification.
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater voltage
- 4 V
- Nominal heater current
- 600 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
- 0.0035 S
- Max plate voltage
- 400 V
- Max plate dissipation
- 12 W
Published historical Telefunken data promoted where legible; filename-designated tube kept distinct from surrounding handbook entries.
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.