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
A2521. Information from 1957
Acorn Valve Base. Zero Insertion Force
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 APP4C. A new valve from Tungsram October 1935
The ARP12. Information from Robert Colman
The Azide Process. Technical article on cathode technology
Barkhausen-Kurz (B-K) Mode Oscillators. Early Centimetric Wave Generation
The Basics of a Colour TV Camera.
Beam Switching Tubes. Counting devices from the 1950's and 1960's
Beam Tetrodes and the 807. Developments in power valves
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 Pick-up Cartridges Modification for Mullard pre-amplifiers.
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
Current Limited 0-200V Supply. A hybrid stabilised supply.
The CV172 Noise Diode. The basics of noise figure measurement
The CV287 Voltage Stabiliser. Information on the priming anode
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 Beam CRTs. A cossor improvement
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.
EM87: a new voltage indicator. Press release from Mullard in 1961
English Electric X-Band Klystrons. A range of reflex klystrons for Radar receiver local oscillators
English Electric 4.5 inch Image Orthicon. Improved image orthicon giving better picture quality
FM Broadcasting and Signal Detection. The ratio detector etc
Gas Clean-up in Xenon Thyratrons. Information from Mullard in 1954.
Gated Valves. Linear and pulse modulation combined
GEC Oscilloscope Screen Phosphors.
A German Ceramic Valve from 1939. Pinchless construction
Glow Modulators. Electronically controlled light sources
Heater-Cathode Insulation. Ratings explained
Heaters of Mullard Television Valves. Enhancements described in 1962
The Heil Tube. Velocity Modulated Oscillator
A High-Power Pentode and Other New Valves - New Mullard valves from 1933.
Hints on the use of a Pick-Up - from 1928.
The Hudson Filament. For improved Audions
'IM' Long-Playing Needles. Made from thorns
Infra-red Image Converters. An introduction
Inside the 6J6. A broken valve explored
Inside the CV54. A broken valve explored
Inside the EF37. A broken valve explored
Inside the QQE03-20. A broken valve explored
Isolantite. Steatite ceramic.
Keeping Voltages Steady. Voltage references and Voltage stabilisers.
Lend-Lease Valves. American supplies during WWII.
Lighthouse Valves. Octal based disc seal valves
Loewe Multi Valve Repair Policy
A Longer Life for Dial Lamps. Lamp powered by heater tap of 35Z5GT
The 'Magic Three' Valves. Standard valves for the modern superhet
Magic Eye Display Chart. Images of the display from no signal to overload
The Magnetron. Origin and description
Marconi 1928-9 Valve Range Advert
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
Micropup Valves. Developing airborne radar.
Moving-Coil Loud Speakers 1928
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 A674SR with Simplex Stereo. Push-pull and parallel amplification with two valves
A New Class B Valve. Mullard introduce the PM2B in 1933
New 'Pentone' Five Electrode Valves. Mullard PM22 and PM24 discussed in 1928.
New Rectifier for Television Receivers. Mullard introduce the PY33
New RF Pentodes from Tungsram. Battery vales for Short-Wave.
New Valve Assembly Method. A semi-automatic aid from Mullard.
New Valves and Circuits. Using the PFL200 from Mullard.
The Nuvistor. A transistor sized valve
Nuvistor Valves - Basics.
Osram Z62. New TV valve from 1939
PCC84 / 7AN7. Brimar information from 1954.
PCF801. Mullard information from 1963.
PCF82 / 9U8. Brimar information from 1954.
Pentagrid Converters. Enter the modern Superhet.
Pentode for Projection Receivers. The new PL820.
Photocell CWS24. A secondary emission photocell
The Philips-Mullard (PM) Series. The first 'azide ' valves
Pioneers of HT Rectifiers. A MOV speciality
Type Q and type V24 Valves. The first hard vacuum valves designed in Britain
Quick Heating Valves. Transmitting valves for mobile use
Quiescent Push-Pull. A more efficient output stage for battery sets
R Type Specification.
Radio Set AN/CPN-3. Transportable Radar beacon from WWII
RCA UHF 'Doorknob' Valve 832.
RCA Television Pentodes 1852 & 1853. Valves from 1938
Rectifiers for Pulse Modulators. High voltage devices with low average current
Replacing a Triode Pentode. WWII substitution of a Heptode
Restoring Lost Emission.A hint for early thoriated tungsten valves
The S625 Valve. The World's first HF screen-grid tetrode
The Screen in an EF80. Explanation of the shield and its use
Secondary Emission Amplifiers. Improvements in stability
Secondary Emission Multipliers. Improvements in TV camera design
Series Pass Valves. Valves for voltage regulators
Should a Glowing Valve be Discarded?.
Silica Valves. A Mullard speciality
Sintered Glass Valve Bases. A Philips development from 1946
Stabilovolt Circuit. Stabilised Power Supply
Still Smaller Hearing Aid Valves. Mullard DF64 and DL64.
Some Notes on the Double Diode Triode. An item from 1933
Storage Tubes. Analogue image storage CRT's
The Strange World of Memory Tubes Computer memory etc.
Strobotron. Flash Tubes
Subminiature Valves. War & Peace
Sylvania 1231 Pentode. New Loctal Base
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
Total Harmonic Distortion. Using oscilloscope FFT display and a few calculations
Tube Amp Doctor. A window sticker celebrating 25 years of the company
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.
Using Cheap DC-DC HT converters.
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