for
transmitting, receiving, industrial, communications, audio, hi-fi,
musical and test equipment applications
Welcome to the Home Page of:
DENNIS R. GRIMWOOD.
TUBE COLLECTOR
and
AUDIOPHILE
(Well, sort of!!)
* * *
To live is to learn
To learn is to know
To know is to grow
To grow is to give
To give is to live!!Anon.
A message for all:
"Let the Golden Rule Overrule the Rule of Gold"
For the uninitiated:
The Golden Rule is: "Do unto others as you would have them do unto you".
The Rule of Gold is: "He who has the gold makes the rule"
"Of all the inventions that have ever made scientific history, the discovery by Lee DeForest that a few turns of wire in between the two elements of a diode vacuum tube were able to control the flow of electrons, can without doubt be classed as among the foremost in its benefits to mankind.
Not only has the three-element vacuum tube
been the means of providing entertainment and education to millions of
people throughout the world, but it has been proved to be the keystone
in the arch upon which has been built innumerable branches of scientific
thought."
Experience is something you don't get until just after you need it!!
Experience comes from bad judgement. Good judgement comes from experience.
Good judgement in audiophilia is to forget about how it "sounds" - enjoy the music!!!!
"I haven't failed. I've found 10,000 ways that don't work." - Thomas Edison
Never be afraid to try something new.
Remember that a lone amateur built
the Ark.
A large group of professionals built the Titanic
This web site has been set up to assist people needing hard to get Electron Tubes, Vacuum Tubes or Radio Valves and related information for constructing or servicing transmitting, receiving, industrial, military,communications, audio, hi-fi, musical and test equipment applications.
This page includes details of:
WANTED:
Information about application, use, performance
and history of the type 803 RF pentode, developed for WWII military transmitter
applications.
This tube was made by a number of manufacturers,
including Taylor, RCA, Westinghouse, GE, KenRad and Cetron.
I have adequate technical data and ratings but
virtually no history or application circuits.
Any assistance will be appreciated.
If you can help, please email electron@webace.com.au
* * *
Tube Design Information for Audio, Broadcast, Modulator and RF Transmitter Service
My ELECTRON page presents details of what electrons are and how to use them for audio and modulator service
My TUBE DATA page presents a selection of rare tube data and circuit design information.
My TUBE DESIGN and APPLICATIONS page presents details of how tubes work and how to use them.
My TRIODES page presents information about triode operation of tetrodes, pentodes and beam power vacuum tubes.
My SCREEN-GRIDS page presents information about requirements for Screen Grids in vacuum tubes; and triode operation of tetrodes, pentodes and beam power tubes.
My ULTRA-LINEAR page presents information about ultra-linear operation of vacuum tubes.
My OPTIMISED ULTRA-LINEAR © OPERATION page describes how to optimise conditions for Hi-Fi U/L.
My OPTIMISED ELECTRON STREAM © TECHNOLOGY page presents new applied engineering technologies to improve performance by optimising requirements for the electron stream in tetrodes, pentodes and beam power tubes.
My POWER SUPPLIES page presents instructions for designing and constructing a power supply for a high-fidelity amplifier
My TRANSFORMERS page presents details of audio output transformers.
My HOW TO page presents instructions for designing and constructing a high-fidelity audio system
My TUBE TESTING page describes the basic principles for testing Electron Tubes.
My BASS REFLEX ENCLOSURE DESIGN page
presents a proven empirical method for designing bass reflex loudspeaker
enclosures
Tubes for Audio Output and Transmitter Modulator Service:
This page shows tubes recommended for AUDIO
AMPLIFIER and MODULATOR APPLICATIONS.
Tube Audio Amplifier and Modulator Circuits - 50W RMS to 1000W RMS
My AUDIO AMPLIFIER and MODULATOR CIRCUITS page presents some interesting circuit diagrams of selected High Power Amplifiers.
This page is included for your information only.
These designs use very high voltages - which can be terminally lethal, require a high level of experience and understanding in amplifier design and construction - particularly component selection, hardware and wiring layout - and are definitely not recommended for the inexperienced or first-time amateur hobbyist to try to construct.
All circuits and information are copyright in their original owner.
Tube Audio Pre-Amplifier and Control Unit Circuits
My TUBE AUDIO PRE-AMPLIFIER
AND CONTROL UNIT CIRCUITS page presents some interesting circuit
diagrams
of selected High-Fidelity Audio Control Units.
Hearing and Hi-Fi Audio
My HEARING AND HI-FI pages describe what you might hear from hi-fi audio.
This page shows the frequency range of many of the common instruments that we want to reproduce from our audio system.
Can you really hear what you think you can hear??
The following articles, courtesy of Electronics Australia, June 1983 edition, may cause you to reconsider what you are actually hearing!!
Tubes and Components for Sale or Swap
My TUBES page presents a selection of tubes and components available for sale or swap
My PARTS page presents details of components
available for sale or swap
Extra Special Links:
My EXTRA SPECIAL LINKS
page shows references to links that I feel are really special for students
and users of electron tubes.
Recommended Tube Suppliers:
This page lists SUPPLIERS I personally
recommend.
Grimwood's Laws of Technology
My Laws of Technology
page presents a selection of principles that apply to the development and
application of technologies
Grimwood's Laws of Organisation
My Laws of Organisation
page presents a selection of principles that apply to the design and behaviour
of organisations
Papers on Management
* * *
Contact:
Dennis Grimwood
Phone: +61 8 9399 5219
Email: electron@webace.com.au
Location:
The City of Armadale.
(My home town)
Perth,
Western Australia,
AUSTRALIA
Page last updated 30 April 2009
This page URL is http://www.webace.com.au/~electron/tubes
806 graphic courtesy "Radiotronics" magazine April 1939
