CH1

Hexode frequency-changing valve for early superheterodyne receivers, intended for mixer/modulator service with an external oscillator. High output resistance supports useful isolation in all-current series-heater radios.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: P8A
Base pins: 8
Nominal heater: 13 V / 200 mA

Description

The Telefunken CH1 is treated as a frequency-changer hexode from the supplied C-series catalog context; the excerpt does not preserve a complete CH1 data row.

Socket description

European 8-pin side-contact base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: P8A
Base pins: 8
Nominal heater voltage: 13 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

Hexode

X-ray radiationInterelectrode capacitances

Plate resistance: 2000000 Ω
Transconductance: 0.00055 S
Max plate voltage: 250 V
Max screen voltage: 125 V
Max plate dissipation: 1.5 W
Max screen dissipation: 0.5 W
Max cathode current: 10 mA

Hexode; canonical SectionType list has no Hexode value, so Other is used.

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 01

1938 Philips Miniwatt Vacuum Tube Catalog

Published operating points and test conditions from this source.

SECTION 1

Hexode

Other

Plate voltage
200 V
Published table operating point
Control-grid bias
2 V
Published table operating point
Screen voltage
100 V
Published table operating point
Screen current
4 mA
Published table operating point

Characteristic

Transconductance
2000000 µS
Published table characteristic
Plate resistance
200000 ohm
Published table characteristic
Heater/filament voltage
13 V
Published heater/filament rating
Heater/filament current
200 mA
Published heater/filament rating

Capacitance

Grid-to-plate capacitance
0.003 pF
Published table capacitance

Data set 02

195X Tunsgram

Published operating points and test conditions from this source.

SECTION 1

Hexode

Other

Typical plate voltage
250 V
Typical combined grid-2/grid-4 voltage
80 V
Oscillator grid-3 voltage
9 V
RMS
Maximum no-current anode voltage
550 V
Maximum grid-2/grid-4 no-current voltage
400 V
Maximum heater-cathode voltage
125 V

Data set 03

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Hexode

Characteristic

Conversion transconductance
550 µS
Modulator
Maximum transconductance
2600 µS
HFIFAmplifier