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Rectifier - Full Wave ·Rectifier-Rectifier

25Z6

Indirectly heated full-wave rectifier and voltage-doubler tube for transformerless receiver supplies. Rated for approximately 700 V peak inverse voltage and 85 mA nominal rectified output from a 25 V heater.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 7O
Socket code: IO
Base pins: 7
Nominal heater: 25 V / 300 mA

Description

Full-wave rectifier and voltage-doubler tube.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7O
Socket code: IO
Base pins: 7
Nominal heater voltage: 25 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7O - 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

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 700 V
Rectifier nominal output current: 85 mA
Rectifier peak forward current: 500 mA
Rectifier forward voltage drop: 22 V
Rectifier max heater-cathode voltage: 350 V

Published maximum ratings, representative operating conditions, rectifier service data, and capacitance columns reviewed.

Section 2

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 700 V
Rectifier nominal output current: 85 mA
Rectifier peak forward current: 500 mA
Rectifier forward voltage drop: 22 V
Rectifier max heater-cathode voltage: 350 V

Second physical rectifier section; electrical properties populated from corresponding identical 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 01

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristic

Heater/filament voltage
25 V
Published heater/filament rating
Heater/filament current
300 mA
Published heater/filament rating

Other

Voltage-doubler RMS voltage per plate
125 V
VoltageDoubler
Voltage-doubler peak plate current
500 mA
VoltageDoubler
Voltage-doubler DC output current
85 mA
VoltageDoubler
Half-wave RMS voltage per plate without series resistor
125 V
HalfWave
Half-wave RMS voltage per plate with series resistor
250 V
HalfWave
Half-wave peak current per plate
500 mA
HalfWave
Half-wave DC output current per plate
85 mA
HalfWave

SECTION 2

Rectifier

Characteristic

Heater/filament voltage
25 V
Published heater/filament rating
Heater/filament current
300 mA
Published heater/filament rating

Other

Voltage-doubler RMS voltage per plate
125 V
VoltageDoubler
Voltage-doubler peak plate current
500 mA
VoltageDoubler
Voltage-doubler DC output current
85 mA
VoltageDoubler
Half-wave RMS voltage per plate without series resistor
125 V
HalfWave
Half-wave RMS voltage per plate with series resistor
250 V
HalfWave
Half-wave peak current per plate
500 mA
HalfWave
Half-wave DC output current per plate
85 mA
HalfWave

Data set 02

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

arrangement. For voltage-doubler considerations, see page
25
arrangement. For voltage-doubler considerations, see page 25.
HEeATER VOLTAGE (A. C.or D.C)...evvvenn
25 V
HEeATER VOLTAGE (A. C.or D.C)...evvvenn.... 25 Volts
HEATER CURRENT ...cvverriunenecncncsnsnnoone
300 mA
HEATER CURRENT ...cvverriunenecncncsnsnnoone 0.3 Ampere
A-C PLATE VOLTAGE PER Prate (RMS)
125 V
A-C PLATE VOLTAGE PER Prate (RMS).......... 125 max. Volts
PEAK PLATE CURRENT...cvetvacnoracannssnnnnas
500
PEAK PLATE CURRENT...cvetvacnoracannssnnnnas 500 max. Milliamperes
D-C OUTPUT CURRENT.cvervovsssnenancrcannnns
85
D-C OUTPUT CURRENT.cvervovsssnenancrcannnns 85 max. Milliamperes
A-C PLATE VOLTAGE PER PrLATE (RMS)
250 V
A-C PLATE VOLTAGE PER PrLATE (RMS)... 125 max. 250* max. Volts
Peax PLATE CURRENT PER PLATE
500
Peax PLATE CURRENT PER PLATE......... 500 max. 500 max. Milliamperes
D-C Output CURRENT PER PLATE
85
D-C Output CURRENT PER PLATE........ 85 max. 85 max. Milliamperes
* An a-c input voltage ter than
125 V
* An a-c input voltage ter than 125 volts requires the use of a series resistor or resistors.
A 100-ohm resistor in each p lead or a 100-ohm resistor comm
100 ohm
A 100-ohm resistor in each p lead or a 100-ohm resistor common to both plates (giving somewhat
The current in the heater circuit should be adjusted to
300 mA
The current in the heater circuit should be adjusted to 0.3 ampere for the normal
are shown on page
109
are shown on page 109. As a supplement to the curves with a-c input voltage, a
As a voltage doubler, the
25
As a voltage doubler, the 25Z6 is useful in “‘transformerless” receivers of the

SECTION 2

Rectifier

Other

arrangement. For voltage-doubler considerations, see page
25
arrangement. For voltage-doubler considerations, see page 25.
HEeATER VOLTAGE (A. C.or D.C)...evvvenn
25 V
HEeATER VOLTAGE (A. C.or D.C)...evvvenn.... 25 Volts
HEATER CURRENT ...cvverriunenecncncsnsnnoone
300 mA
HEATER CURRENT ...cvverriunenecncncsnsnnoone 0.3 Ampere
A-C PLATE VOLTAGE PER Prate (RMS)
125 V
A-C PLATE VOLTAGE PER Prate (RMS).......... 125 max. Volts
PEAK PLATE CURRENT...cvetvacnoracannssnnnnas
500
PEAK PLATE CURRENT...cvetvacnoracannssnnnnas 500 max. Milliamperes
D-C OUTPUT CURRENT.cvervovsssnenancrcannnns
85
D-C OUTPUT CURRENT.cvervovsssnenancrcannnns 85 max. Milliamperes
A-C PLATE VOLTAGE PER PrLATE (RMS)
250 V
A-C PLATE VOLTAGE PER PrLATE (RMS)... 125 max. 250* max. Volts
Peax PLATE CURRENT PER PLATE
500
Peax PLATE CURRENT PER PLATE......... 500 max. 500 max. Milliamperes
D-C Output CURRENT PER PLATE
85
D-C Output CURRENT PER PLATE........ 85 max. 85 max. Milliamperes
* An a-c input voltage ter than
125 V
* An a-c input voltage ter than 125 volts requires the use of a series resistor or resistors.
A 100-ohm resistor in each p lead or a 100-ohm resistor comm
100 ohm
A 100-ohm resistor in each p lead or a 100-ohm resistor common to both plates (giving somewhat
The current in the heater circuit should be adjusted to
300 mA
The current in the heater circuit should be adjusted to 0.3 ampere for the normal
are shown on page
109
are shown on page 109. As a supplement to the curves with a-c input voltage, a
As a voltage doubler, the
25
As a voltage doubler, the 25Z6 is useful in “‘transformerless” receivers of the

Data set 03

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Application

Service
Full-wave rectifier / voltage doubler

SECTION 2

Rectifier

Application

Service
Full-wave rectifier / voltage doubler

Data set 04

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristic

Heater/filament voltage
25 V
Published heater/filament rating
Heater/filament current
300 mA
Published heater/filament rating
Tube voltage drop
22 V
At 150 mA DC

Other

DC output current
75 mA
RectifierDoubler
Peak inverse voltage
700 V
RectifierDoubler
RMS supply voltage
235 V
RectifierDoubler
Peak current
450 mA
RectifierDoubler

SECTION 2

Rectifier

Characteristic

Heater/filament voltage
25 V
Published heater/filament rating
Heater/filament current
300 mA
Published heater/filament rating
Tube voltage drop
22 V
At 150 mA DC

Other

DC output current
75 mA
RectifierDoubler
Peak inverse voltage
700 V
RectifierDoubler
RMS supply voltage
235 V
RectifierDoubler
Peak current
450 mA
RectifierDoubler