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0.18A Series-string DC Mains Valves. A Continental idea

1950s Valve Manufacture. Anode pressing

1950s Valve Manufacture. Cathode spraying

1950s Valve Manufacture. EF80 Assembly

1950s Valve Manufacture. Glass tube manufacture


1950s Valve Manufacture. Grid winding

1950s Valve Manufacture. Heater production

1950s Valve Manufacture. Making a pressed glass foot

1950s Valve Manufacture. Manufacture of Tungsten wire

1950s Valve Manufacture. Mica supports


1950s Valve Manufacture. Evacuation and testing

The 1T4 Exploded. Manufacturers Diagram

6.3 Volt Valves. Notes on introduction

The 6H6 Diode Family. A sidelight on our exhibits

813 Beam Transmitting Tetrode from RCA. Annotated diagram


A1714 Data-sheet.

A2087 Data-sheet.

A2521. Information from 1957

A3064 Data-sheet.

Acorn Valve Base. Zero Insertion Force


Acorn Valves.

Additional EF91 Information. A supplement to The EF91 article

American Valve Designations (1943). How to interpret the type numbers

Amplification and Valve Characteristics. Technical article on mu, gm and gain-bandwidth

The Anode Bend Detector. A high impedance AM detector


The ARP12. Information from Robert Colman

The Azide Process. Technical article on cathode technology

Barkhausen-Kurz (B-K) Mode Oscillators. Early Centimetric Wave Generation

Beam Tetrodes and the 807. Developments in power valves

Bi-Grid Valves.



BVA Influence. The effect of a cartel in a global market

BVA Utility Valves. The WWII civilian radio valves

Cathode-Ray Amplifiers. Von Lieben's work

Catkin Valves. A 'blind alley'?


Ceramic or Moulded Base Caps? Why choose Ceramic?

Characteristics and Distortion. Within a small signal pentode

The Coherer. The mechanical RF detector

Compactrons. General Electric introduce up to four valves in one envelope

Continental Imports of the 1930's.


Controlled Warm-up Times. Mullard information from 1963.

The Cossor Wuncell Range. The first oxide-coated valves produced in Britain

The Cossor Point One and Stentor Series Valves. The Kalenised filament at work

Current Limited 0-200V Supply. A hybrid stabilised supply.

The CV172 Noise Diode. The basics of noise figure measurement


The CV14x Series IR Converter Cells. Early night vision tubes

De Forest and the Audion. Bad theory slows development

The DET1. The first thoriated tungsten dull emitter transmitting valve

Double Triodes ECC81, ECC82 & ECC83 and pin compatibles. A substitution list

DER Valves. Evolution of Early Dull Emitter Valves


Disc Sealed Valves. Also known as Planar valves and Lighthouse Valves

Domestic Rectifiers. Why indirect heating was needed

The Early Mullard Naming Convention. The Meaning of AC044

Early Transmitting Valves. WW1 valve technology

Elliott 803B Computer Video.


Eddystone Radio 6AM5 Box. A spare for their receivers

The Ediswan Safety Cap. To avoid HT across the filament

The EF91 and the Blue Band. Stopping gas emission from the glass.

The EHT Rectifier DY86. Description from Mullard, March 1963.

The 'Electro' Audion. The text of a 1913 advert


Electron Cameras. Design technique from Baird Television 1939

The EM1 and the EM1. The genuine and the ersatz.

EM71 Data-sheet.

EM87: a new voltage indicator. Press release from Mullard in 1961

English Electric 4.5 inch Image Orthicon. Improved image orthicon giving better picture quality


FM Broadcasting and Signal Detection. The ratio detector etc

Gated Valves. Linear and pulse modulation combined

GEC Oscilloscope Screen Phosphors.

A German Ceramic Valve from 1939. Pinchless construction

Heater-Cathode Insulation. Ratings explained


Heaters of Mullard Television Valves. Enhancements described in 1962

The Heil Tube. Velocity Modulated Oscillator

The Hudson Filament. For improved Audions

Infra-red Image Converters. An introduction

Inside the EF37. A broken valve explored


Lighthouse Valves. Octal based disc seal valves

A Longer Life for Dial Lamps. Lamp powered by heater tap of 35Z5GT

The 'Magic Three' Valves. Standard valves for the modern superhet

The Magnetron. Origin and description

M-OV's Development Laboratory disclaimer label.


M-OV's Screened Grid Valves. S625, S215, MS4 and VMS4

Mercury Vapour Rectifiers. How to use correctly

Method of Repairing Valve Filaments. Repair an R Type

Micromesh PA1 Instruction Sheet. Original Maker's Document

Muirhead D-649-L/E1. Mufax chart recorder maintenance manual.


Mullard Flash-tube General Data.

Mullard Special Quality Valves General Data.

Mullard's 2D4A or Philips KB2. A doubt arises

Mullard's ECC83. A world series valve from Mullard

Mullard's ECL86. A new triode pentode from Mullard (1962)


Mullard's EF36 and EF37. Evolution to an Audio Classic

Mullard's EF86. A world series valve from Mullard

Mullard's EL34. A world series valve from Mullard

Mullard's EL84. A world series valve from Mullard

Mullard's TV4. A cathode-ray tuning indicator from 1936


The Mullard Receiving Valve Naming Convention. How to decode a receiving valve name

Mullard 'Straight' Screened Pentodes. SP valves from Mullard

The Mullard Transmitting & Industrial Valve Naming Convention. How to decode a Mullard Industrial valve name

Mullard xx5x Series Valves. Notes on Mullard's miscellaneous range

Murphy Radio.


Murphy A674SR with Simplex Stereo. Push-pull and parallel amplification with two valves

A New Class B Valve. Mullard introduce the PM2B in 1933

New Rectifier for Television Receivers. Mullard introduce the PY33

New Valve Assembly Method. A semi-automatic aid from Mullard

The Nuvistor. A transistor sized valve


Nuvistor Valves - Basics.

PCC84 / 7AN7. Brimar information from 1954

PCF801. Mullard information from 1963

PCF82 / 9U8. Brimar information from 1954

Pentagrid Converters. Enter the modern Superhet


A Personal History of Mullard DF ORA Valve.

Photocell CWS24. A secondary emission photocell

The Philips-Mullard (PM) Series. The first 'azide ' valves

Pioneers of HT Rectifiers. A MOV speciality

PM22 Data-sheet.


Type Q and type V24 Valves. The first hard vacuum valves designed in Britain

QS92/10. Measurements

Quick Heating Valves. Transmitting valves for mobile use

Quiescent Push-Pull. A more efficient output stage for battery sets

Radio Set AN/CPN-3. Transportable Radar beacon from WWII


Rectifiers for Pulse Modulators. High voltage devices with low average current

Restoring Lost Emission.A hint for early thoriated tungsten valves

The S625 Valve. The World's first HF screen-grid tetrode

Secondary Emission Multipliers. Improvements in TV camera design

Series Pass Valves. Valves for voltage regulators


The Screen in an EF80. Explanation of the shield and its use

Shortpath Construction.

Should a Glowing Valve be Discarded?.

Silica Valves. A Mullard speciality

Stabilovolt Circuit. Stabilised Power Supply


Storage Tubes. Analogue image storage CRT's

Strobotron. Flash Tubes

Subminiature Valves. War & Peace

Telefunken Valve Data - 1944. PDF of shortform data with base connections

Television Line Output Stages. Ediswan Mazda aspects of design No. 8. February, 1959.


Television RF Valve Development. The challenge of high bandwidth gain at 45 MHz

Television and Video Camera Tubes. How they work

Thermistors and Heater Chains. Avoiding thermal shock in series heater chains

Tungar rectifiers. A General Electric Booklet

Tuning Indicators. A need to accurately tune superhets


Two New Converter Valves. 6K8

Two New Mullard Television Valves. PCF802 and PC900

The Twystron. high power Wide bandwidth microwave amplification

Type 424 Radar.

Valve Care Basics. Make 'em last


Valve Cathodes. A review by J Brian Dance from 1961

Valve Heater Voltages. Effects of under and over voltage

Valve Life. Results of Marconi tests

Valves for Single Sideband Generation.

The Variable mu (μ) Pentode. A brief description


The VCR139A and ACR10. Equal?

VHF Anode Connector. For QQV03-20A etc.

VT Valve Series. UK Post office, RAF and US types

The VT25. A modernised version of the DET1

When a Beginner buys a Valve. A guide to types in December 1924


Wired-in Valves. Reasons for using them

Wiring Jigs. Equipment production tools

X65 Instruction Sheet. Original Maker's Document



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