PSVANE 300B-T TRAFOMATIC EXPERIENCE ONE 2A3 Single -Ended
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Valve Biasing
VALVE AMP BIASING Biased information How have valve amps survived over 30 years of change? Derek Rocco explains why they are still a vital ingredient in music making, and talks you through the mysteries of biasing N THE LAST DECADE WE HAVE a signal to the grid it causes a water as an electrical current, you alter the negative grid voltage by seen huge advances in current to flow from the cathode to will never be confused again. When replacing the resistor I technology which have the plate. The grid is also known as your tap is turned off you get no to gain the current draw required. profoundly changed the way we the control grid, as by varying the water flowing through. With your Cathode bias amplifiers have work. Despite the rise in voltage on the grid you can control amp if you have too much negative become very sought after. They solid-state and digital modelling how much current is passed from voltage on the grid you will stop have a sweet organic sound that technology, virtually every high- the cathode to the plate. This is the electrical current from flowing. has a rich harmonic sustain and profile guitarist and even recording known as the grid bias of your amp This is known as they produce a powerful studios still rely on good ol’ – the correct bias level is vital to the ’over-biased’ soundstage. Examples of these fashioned valves. operation and tone of the amplifier. and the amp are most of the original 1950’s By varying the negative grid will produce Fender tweed amps such as the What is a valve? bias the technician can correctly an unbearable Deluxe and, of course, the Hopefully, a brief explanation will set up your amp for maximum distortion at all legendary Vox AC30. -
The EL34 Power Tube HI-'I
The EL34 Power Tube HI-'I .... o.l"r A lp Musical Evaluations of a Classic Design .... A_I . 4.551 Single. Ended EL·84 Stereo Amp ~ _ .... ,���\� . -""" ".. - ...-., p.,.��",-, �. 1""""' -�,�.. � . oPf' ' ".".. ._ '" "'� .,_ "'�•• '" "'� ...- ' ,t\1".' ,w ' � "'\)U'�..,. ,\ 1\ ' ��-;---""\.\. ",.-" " ".,... "", ""�_ " tt"�" ,....-" ...........,...1"'" '�" ""t\1 _,.,.""" ....'" 'r·\ �'� . � ......,. �,,,. � ,..' ",...., \PJOl8'i .... �,�oPf',.,....;:.. O\ �,cl\ ., .... " , � ...,,.. AA �r- . · :::- ,,<,<, ,. ..""'"':k ...0'\1. � ':;: "",;: .. .._ " r ,...,.. _ "" " .-;.,,...""".... ",.... ......,.,.,,, -;;. ,... :;..,� _ """;.... -� . 0 """ " . ,,..,. ,t" ,,'" <""" , .-_,.;.;.''' � .. '''''''-o<f' _ ....;;; .,;::; , -- '" " ,.,...,.. "" .'" ::, ,t"� ��. ...,.,..,.;.;."1"" ''/'''' � _.� "" f"'� . � ' M'''" ' "- """",,; ,.of .,.,..� .. ...,. ' "' 1" '". '_1"""' . .. " ,,,,,,,,,,,,,,,_ f"""";""';..::: .,... " '�,;;.;:' ' ......,,..,..,. _-:: -__':1oPf' ::;;'", --''''"", ""","" ", ' �':::', � ' ""r; """"-"' .''''''''�}.. ,t\1 \ �·, � ot ,;: "" � ,.,. ---� , _.at" � t\JV" �� � 'i"'f'- " .::... .. .... �. , ,�,....,.' .....;. _ ...-:> ".... JC8'I\\ -, \�..- WOl\ """,.""''1"'"- �""'" � '-,�� 6<1\"""- ' ""'..,... � ...... � 6U'." �. - ,t\1 , . _ , "'" 1J>b\"� ��, oPf''' .,..-._ " "" .0. " ..... ���_���\t"�'".. ' ....... "" "",",. N ��:L [\l\'J � ��i y< • D T 0 • , 5 P A G • A N D N D u 5 T • y N • w 5 Beware of FakeNOS Tubes! CE Distribution US Distributor for Electronic Tubes VTV Issue # 1 6 JJ Over the last year or so, we have JJ Electronic, -
VACUUM TUBE VALLEY Fall 1995 Price $6.50
Pub/ish«lQuarterly Celebrating the History and QlIOlity of Vocllum Tube Te<lmology luue 2 Vo/LlI7U! I VACUUM TUBE VALLEY Fall 1995 Price $6.50 Magnum SE Amplifier Da\-c Wolze rec.:nrlydesigned and built an SE amp with power and punch. Page 17 ...... Tube Review: EL·34 In one of existence since 1953 and th(Omost popular audio tubes of all time, rhe EL-34 has many variarions and performance characteristics. Page 8 Heath W-6M Heathkit: Early Tube Hi-Fi years. In This Issue .. manufacturer of Heathkit was the largest d�c Ironic kits in the US, alone time, selling over ntbe bldustry News 350 different types of kts. Learn more aboUl Check OUt the latest happen gs i in in the the early days of Heath Hi-Fi. Page 3 world of vacuum tubes. Learn the results of a recent survey of tuhe dislfih mors and sellers conducted by VIV. MU/UlrdEL-34s Harbouroudines the latest Ilem and Eric Early Cinema Sound Views. Page 15 vrv examines an early \xre�ternElectric [heater sound system. Page 24 Guitar Amplifiers Learn about how to get the best guitar tone. Chaclie Kittleson interviews Terry Buddingh, Tube Amp Expert from GuiTdrPi4yer Magazine. Page 20 Heatb w-4AM Tube Matching: Get the best soutuisfrom your amp. Matched tubes arc essential for opti mum performance from push-pull amps. n John Atwood explai s tube matching techniques for the layman. Page 22 Vacuum Tube Valleyis published quarterly for electronic enthusiasts interested in the See (Jur newfiatures in this months colorfv1 past, present and fvture af yocuum tube electronics. -
Využití Elektronek V Současné Době
Jihočeská univerzita v Českých Budějovicích Pedagogická fakulta Katedra aplikované fyziky a techniky Diplomová práce Využití elektronek v současné době Vedoucí práce: Ing. Michal Šerý, Ph.D. Autor práce: Bc. Josef Čepička Studijní obor: Učitelství fyziky a výpočetní techniky s elektronikou pro 2. stupeň ZŠ, kombinované studium České Budějovice 2013 Anotace Cílem této diplomové práce je zkonstruování ukázkového modelu elektronkového zesilovače s možností měření procházejícího signálu ve více bodech a možností náhledu do zapojení a konstrukce zesilovače. Na začátku práce je popsáno několik zásadních témat týkajících se elektronek a zapojení s nimi, jako například princip zesílení signálu pomocí elektronek, třídy nízkofrekvenčních zesilovačů a popis několika typů nežádoucích zkreslení. Další část práce pojednává o samotném návrhu zkonstruovaného zesilovače, popisu vzniku a osazení desek plošných spojů a použitých elektronkách a transformátorech. Následující část práce je věnována měření základních vlastností zesilovače a měření vlastností elektronek pomocí přístroje TESLA BM215A. V závěrečné kapitole jsou uvedeny technické parametry zesilovače a fotodokumentace. Abstract Aim of this thesis is to construct a demonstration model of a vacuum tube amplifier with a possibility of measurement of signal on more places and a possibility to see the wiring and construction of the amplifier. The first part of the work treats some important themes concerning vacuum tubes and wiring with them, for example a principle of signal intensification by vacuum tubes, categories of low-frequency amplifiers and description of several types of undesirable distortions. Next part deals with the design of the constructed amplifier, the description of the construction itself and placement of the components on the printed circuit boards and used vacuum tubes and transformers. -
Yellow Jackets Dimensions Sheet
TUBE CONVERTERS Yellow Jackets® tube converters allow EL84 power tubes to be used in place of the most common guitar amp power tubes including 6L6, EL34, 6V6, 7027, 6550 and 7591. Most Yellow Jackets® screen No provide a substantial output power grid Connection reduction and a “self-bias” Class A 9 1 No EL84 configuration for the EL84 so that no Connection control bias adjustment is required. Yellow 8 2 grid Jackets® are like getting a whole new amp. plate 7 3 cathode + suppressor grid Yellow Jackets® Types No 6 4 Connection 5 filament YJS p. 2 filament YJSHORT p. 3 YJC p. 3 YJ20 p. 4 YJUNI p. 4 1 9 YJ7591 p. 4 YJR p. 5 1 8 screen control grid 4 5 grid plate 3 6 No Connection 2 7 filament filament No 1 8 cathode Connection + suppressor grid 1 Why would I want to convert to EL84's using Yellow Jackets®? Every power tube type offers a different characteristic sound and feel. EL84's have a very tight and focused sound which has become world renown by their use in the British VOX™ AC30 guitar amplifiers. Additionally, most Yellow Jackets® converters will produce a substantial maximum power reduction (50% to 90%) making it easier to find that sweet, warm mix of preamp and power amp distortion at a lower volume. Yellow Jackets also convert the power tube bias to “self-bias” Class A so that no bias adjustment is necessary. You can switch back and forth between EL84's and your amplifier’s original power tubes without rebiasing. -
The 18 Watt Amp Builder's Guide
The 18 Watt Amp Builder's Guide April 2018, Version 3.0 For the sole personal use of Trinity Amps Customers. Parts © Trinity Amps 2005 - 2017 www.trinityamps.com Trinity Amps 18 Watt Builder’s Guide. Version 3.0 Page - 2 Table of Contents Table of Contents .................................................................................................................................................. 3 Thank You! ............................................................................................................................................................ 5 Introduction .......................................................................................................................................................... 7 Acknowledgements ............................................................................................................................................... 7 WARNING............................................................................................................................................................ 8 Version Control ..................................................................................................................................................... 9 Fender and Marshall Tone controls ..................................................................................................................................................... 13 VOX Tone controls ............................................................................................................................................................................... -
Next NMRCC Meeting February 11Th Theme: Pre-1930 Radios
Grigsby-Grunow Majestic 1933 # 02 Vol-23 2018 extension speaker for 66 GGM car radio Underside of a EH Scott Allwave 27 with new Chinese capacitors installed. 1954 McIntosh MC60 with Gold Lion KT88 at 2A3 69 Watts out Next NMRCC Meeting February 11th Theme: Pre-1930 radios Anyone have any idea what a ballpark fair market value would be for a Sherwood S3000 Mark IV Stereo version in excellent cosmetic condition restored by RadioX a few years ago is worth...thanks SHERWOOD Model S-3000 IV FM/MX (Circa 1962) by David Wilson I have been working over the years to recre- a child growing up in the late ate my father’s original hi-fi system that he As 1950s and ‘60s, we remember se- started to build in the mid 1950s and his lective things. The four things about my later 1960s hi-fi stereo father that I remember are music (which I system. equate to his 1950s Hi-Fi equipment and his later 1960s stereo equipment), Beethoven, The Sherwood 3000 IV high-end movie and photography equip- FM tuner I acquired a ment, and Chrysler Imperials with Hemi few months ago is the engines. He subscribed to Stereo Review exact tuner my and Consumer Reports, and read everything father acquired in 1962, about something before he went out and when I was five years bought his hi-fis, cameras, or cars. old. These tuners were considered great stereo In the winter of 1962, my father came home tuners for the time. In with a new component to his hi-fi system. -
LM-88IA Integrated Tube Amplifier – Push Pull KT88 – 2X42w
LM-88IA Integrated tube amplifier – Push Pull KT88 – 2x42W Line Magnetic Audio is a brand of High end products founded in 2005. Now it has HIGHTLIGHTS become well known with its series reproduction of music and regarded as a SPECIFICATIONS forerunner in presenting innovative products with cutting edge technology and P Point-to-point wiring lasting intrinsic value. Tube electronics, CD players, Classic horns, Classis field coil Class A amplifier P Triode/ultra-linear modes speakers, DACs, a lot of different series of products we are working on not only 2x42W RMS Triode mode P High quality components Classis electronics but also new technology on dacs and CD players. 2x30W RMS Ultra-linear mode Forty-two watts per channel, Class AB Integrated Stereo Amplifier with KT88 Tubes: 2x 6CL7, 2x 12BH7, (JJ Electronic) output power tubes, 6CL8A (Mullard) and 12BH7 (Electro Harmonix) 4x KT88 input tubes. Ultra-linear or triode mode LM-88IA Amplifier can operate in two different ways Auto-biased or Fixed bias. You THD : 1% (1kHz) can select the one you prefer. Power output for Auto-bias mode is 45 watts while for Signal/Noise ratio: fixed bias it is 30 watts per channel. 87dB (Weighted A) Frequency response: Specially designed Toroid transformers made of Z11 Core fort power supply and two 10 to 50.000 Hz (-1.5 dB) Japanese Audio grade EI types of output transformers with wide bandwidth are Sensitivity: applied. All transformers and chokes are encapsulated and installed separately on 180mV (Fixed Bias) the amplifier to avoid and lower the disturbance between each other. -
Yjshort Instruction Sheet
Designed by ® Designed by ® Designed by ® Designed by ® Designed by ® Yellow Jackets® Yellow Jackets® Yellow Jackets® Yellow Jackets® Yellow Jackets® Tube Converter Tube Converter Tube Converter Tube Converter Tube Converter YJShort YJShort YJShort YJShort YJShort Includes EL84 Power Tubes Includes EL84 Power Tubes Includes EL84 Power Tubes Includes EL84 Power Tubes Includes EL84 Power Tubes Handmade in the U.S.A. Handmade in the U.S.A. Handmade in the U.S.A. Handmade in the U.S.A. Handmade in the U.S.A. Yellow Jackets® Yellow Jackets® Yellow Jackets® Yellow Jackets® Yellow Jackets® • Converts most audio amplifiers with 6L6s, EL34s, • Converts most audio amplifiers with 6L6s, EL34s, • Converts most audio amplifiers with 6L6s, EL34s, • Converts most audio amplifiers with 6L6s, EL34s, • Converts most audio amplifiers with 6L6s, EL34s, 6550s or 6550s or 6550s or 6550s or 6550s or 6V6s to EL84s without modification or rebiasing. 6V6s to EL84s without modification or rebiasing. 6V6s to EL84s without modification or rebiasing. 6V6s to EL84s without modification or rebiasing. 6V6s to EL84s without modification or rebiasing. • Converts from Class AB to Class A operation! • Converts from Class AB to Class A operation! • Converts from Class AB to Class A operation! • Converts from Class AB to Class A operation! • Converts from Class AB to Class A operation! • Drops output power by 50% to 70%. • Drops output power by 50% to 70%. • Drops output power by 50% to 70%. • Drops output power by 50% to 70%. • Drops output power by 50% to 70%. • Safe for all common amplifiers and transformers. • Safe for all common amplifiers and transformers. -
YJS Instructions
Designed by ® Designed by ® Designed by ® Designed by ® Designed by ® Yellow Jackets® Yellow Jackets® Yellow Jackets® Yellow Jackets® Yellow Jackets® Tube Converter Tube Converter Tube Converter Tube Converter Tube Converter YJS YJS YJS YJS YJS Includes EL84 Power Tubes Includes EL84 Power Tubes Includes EL84 Power Tubes Includes EL84 Power Tubes Includes EL84 Power Tubes Handmade in the U.S.A. Handmade in the U.S.A. Handmade in the U.S.A. Handmade in the U.S.A. Handmade in the U.S.A. Yellow Jackets® Yellow Jackets® Yellow Jackets® Yellow Jackets® Yellow Jackets® • Converts most audio amplifiers with 6L6s, EL34s, 6550s • Converts most audio amplifiers with 6L6s, EL34s, 6550s • Converts most audio amplifiers with 6L6s, EL34s, 6550s • Converts most audio amplifiers with 6L6s, EL34s, 6550s • Converts most audio amplifiers with 6L6s, EL34s, 6550s or 6V6s to EL84s without modification or rebiasing or 6V6s to EL84s without modification or rebiasing or 6V6s to EL84s without modification or rebiasing or 6V6s to EL84s without modification or rebiasing or 6V6s to EL84s without modification or rebiasing • Converts from Class AB to Class A operation! • Converts from Class AB to Class A operation! • Converts from Class AB to Class A operation! • Converts from Class AB to Class A operation! • Converts from Class AB to Class A operation! • Drops output power by 50% to 70%. • Drops output power by 50% to 70%. • Drops output power by 50% to 70%. • Drops output power by 50% to 70%. • Drops output power by 50% to 70%. • Safe for all common amplifiers and transformers. • Safe for all common amplifiers and transformers. -
Appendix A: Some Basic Circuit Theory
Appendix A: Some Basic Circuit Theory Voltage and Current Polarities and Conventions Unless we are dealing specifically with the flow of electrons through a vacuum tube, we will assume current flows from positive to negative. This is called conventional current flow. Conventional current flow is used by virtually all manufacturers today on transistor and IC data sheets, application notes, etc. As shown in Fig. A.1, voltage drops across components will be designated using curved arrows. Think of these arrows as voltmeters that sense the voltage across a given component. The point of the arrow is equivalent to the positive lead of a voltmeter. Currents will be represented with arrow heads drawn on the wires in which the current is flowing. For the resistor and the diode shown in Fig. A.1,if current is flowing the direction indicated, the current is positive, and the voltage dropped across the components will be positive. Linear Circuits Ideally, resistors, capacitors, inductors, voltage sources, and current sources are linear circuit elements. If you graph the current vs. voltage characteristic for a linear component you get a straight line, as shown for the resistor in Fig. A.1. One of the nice things about linear components is that we can use Ohm’s law (V ¼ IR) to relate I, V, and R. Because the plot of current vs. voltage is a straight line, we can pick any point on the line and get the same result for R ¼ V/I. Diodes, transistors, and tubes are all nonlinear devices. An example is the graph of current vs. -
To "Vacuum Tube Valley"
INDEX TO VACUUM TUBE VALLEY (R) ISSUES 1 - 20 Copyright (c) 2006, 2007 Ludwell A. Sibley. All rights reserved. CONTENTS Amplifiers - New ........................................................................ 1 Receivers .................................................................................... 3 Amplifiers - Old .......................................................................... 1 Speakers ..................................................................................... 3 Biographies, Obituaries, Personalities ......................................... 2 Technology - General ................................................................ 3 Business Climate ........................................................................ 2 Test Equipment .......................................................................... 3 CD Players ................................................................................. 2 Test Techniques ......................................................................... 4 Components ................................................................................ 2 Tubes - General ........................................................................ 3 Computers - Tube ...................................................................... 2 Tubes - By Type....................................................................... 4 Histories - Manufacturers, Distributors ....................................... 2 Tuners........................................................................................