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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.

 

Brimarize!.

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

BVA Utility Valves. The WWII civilian radio valves

Catkin Valves. A 'blind alley'?

Ceramic or Moulded Base Caps? Why choose Ceramic?

 

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

 

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

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

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