Radio Age 12 2020 DEC.Pdf

Total Page:16

File Type:pdf, Size:1020Kb

Radio Age 12 2020 DEC.Pdf RADIO AGE The Vintage Radio Journal of the Mid-Atlantic Antique Radio Club Volume 45 December 2020 Number 12 The Midwest Radio Corporation By Brian Belanger ounded by A. G. Hoffman when he began prices. Midwest was unusual because it did not rely F making simple radios in his Cincinnati basement, on a dealer network and jobbers, but rather sold Midwest sold its first radio in 1920—the one-tube directly to customers. Its marketing strived to model shown on this page. convince potential buyers that they could save big money by ordering right from the factory. Of course The company introduced a number of models in its if you ordered a heavy console radio, the significant first few years, including the regenerative set shown shipping cost (usually railway express) had to be on page 3. But Alan Douglas says it was advertised considered. Midwest sometimes quoted prices only for one month, probably because the company without including the cabinet cost because the same did not have an Armstrong license and may have chassis could be used in more than one cabinet. been threatened with patent infringement unless it Midwest offered a time payment plan and a 30-day immediately ceased selling regenerative sets. trial period with a full refund if you were not satisfied. At first Hoffman used “Miraco” [MIdwest RAdio COrporation] as his brand name, but later, just In its first decade, Miraco did reasonably well Midwest. The company advertised widely in popular keeping up with changing technology and its com- magazines and bragged about its low “factory direct” (Continued on page 3) Midwest’s first radio (1920), called the Model VT. It A. G. Hoffman, Midwest’s founder. appears to use an Audiotron type tube. BOUT MAARC and RADIO AGE. Radio Age became the A monthly newsletter of the Mid-Atlantic Antique Radio Club in Mid- June 1994. Prior to that date, the MAARC Newsletter and Radio Age were separate publications. Atlantic Subscription to Radio Age begins with the next available issue after the membership application and dues are received. Dues are $24 per Antique year in the US, $36 in Canada, and $60 elsewhere, all payable in US dollars. Two-year, three-year, and life memberships are available; contact the Membership Chair (see column at left). All Radio checks are payable to MAARC and, for new members, must accompany the membership application, which is available from the Club Membership Chair or the MAARC website (www.maarc.org). If you change your mailing address, email, or phone number, please notify the Membership Chair immediately so corrections can be made to Radio Age’s mailing list. The Post Office will not forward MAARC Board of Directors your newsletters. Officers Directors Back issues of the MAARC Newsletter from Vol. I, No. 1 (August 1984) and most issues of Radio Age from Vol. 1, No. 1 (October President Hale Adams 1975) are available free on the Members-Only section of the John Begg 410-521-8077 1708 Donald Place [email protected] MAARC website (www.maarc.org). Hard copies are available Silver Spring, MD 20902 postpaid for $3.50 from Geoff Shearer 301-649-4663 JoAnna Fabro [email protected] 240-391-1039 Submissions to Radio Age are welcomed. Typewritten copy is [email protected] preferred to handwritten. Articles should be submitted in electronic Vice President, Webmaster & Facebook Manger Joe Meagher format, preferably via email or on a CD or flash drive, in MS Word David Rossetti 410-451-9008 or RTF format, without fancy formatting, because the editors will 317 Edgemere Drive [email protected] have to modify it anyway. Photographs, if hardcopy, should be high Annapolis, MD 21403 quality black and white or color images. Permission to reprint any 410-279-0226 Bruce Pellicot image or graphic used in the article must be obtained by the author. [email protected] 410-461-7441 [email protected] Contact the editors for further guidance. Contact the editors for Treasurer further guidance. Send your submission to any one of the editors Rod Matzko Roy Stehlik and include your name, address, phone, and email. 3 Coloma Court 410-517-0566 Sterling, VA 20164-5507 [email protected] MAARC MONTHLY MEETINGS. Most MAARC meetings are 703-406-2713 [email protected] Eric Stenberg held at the Davidsonville Family Recreation Center, 3789 Queen 703-780-7391 Anne Bridge Rd., Davidsonville, MD (map below). From U.S. 50, Radio Age Co-Editors [email protected] take MD 424 south for 2.5 miles. Turn right on MD 214 for 0.6 Ed Lyon miles, and angle left on Queen Anne Bridge Road for 1.1 miles. The 11301 Woodland Way Randy Warren entrance will be on your left. The January meeting is held at the Myersville, MD 21773-9133 (Capacitor Sales) 301-293-1773 703-978-6144 National Electronics Museum in Linthicum, MD. April and [email protected] [email protected] December meetings are usually held at the Sully Station Community Center in Northern Virginia. Check the calendar on p. Brian Belanger 16 for details. 115 Grand Champion Drive Rockville, MD 20850-5608 301-258-0708 [email protected] Domi Sanchez Map — Davidsonville Family (Auction Manager) 902 Orange Drive Recreation Center (not to scale) Silver Spring, MD 20901-1004 3789 Queen Anne Bridge Road, Davidsonville, MD 21035 240-691-6607 [email protected] Membership & Back Issues Geoff Shearer 14408 Brookmere Drive, Centreville, VA 20120-4107 703-818-2686. [email protected] Annual MAARC Membership Fee is $24 Life Membership is $426 or 3 installment options at $142 The entire contents of this publication are copyright ©2020 Mid-Atlantic Antique Radio Club, unless specifically marked otherwise on each article. Generally, all articles in Radio Age may be reprinted, provided specific permission is first obtained from a Radio Age editor (and the copyright holder, if not Radio Age) and full credit is given. We value and respect your privacy. MAARC’s membership directory and listing will not be sold or marketed to any other organizations or businesses. Editor, designer, and production for this issue: Brian Belanger Proofing: Domi Sanchez Radio Age December 2020 Visit MAARC’s web site at www.maarc.org page 2 Ad in Radio News, October 1921 for Miraco’s regenera- tive model, sold only briefly. (Most likely due to patent infringement issues.) (Continued from page 1) petitors. The company offered single dial tuning in 1925, AC operation in 1928, superhets in 1930, and screen grid sets in 1931. The 1930s was Midwest’s most successful era. It claimed to have sold more than 120,000 radios by 1936. After World War II Midwest continued to make radios, and even a few television sets. In later years the company was called Midwest Radio and Television. A. G. Hoffman retired in 1953 and the company went out of business in the late 1950s. We can only speculate about why. Its demise may have been partly because of the loss of Hoffman’s leadership and partly because of the need to transition into transistor technology. During the 1930s the company’s adopted a strategy of emphasizing high tube count. Midwest tended to seek ways to use two tubes to perform a function that other manufacturers accomplished with one, e.g., using two rectifier tubes. A Midwest console that touted eighteen tubes might have performed comparably to an RCA, Zenith, or Philco radio that used perhaps ten or eleven tubes. (Midwest might have called attention to possible savings on winter fuel bills because their radios generated so much heat!) Popular Science Miraco ad, April 1924 . To be fair, Midwest radios were well designed, used good quality parts, and performed respectably. Radio collectors today admire Midwest sets for their attractive “machine age” cabinet styles, although In This Issue compared to competitors like Scott, Midwest’s cabinets tended to be more cheaply made (nails and Midwest Radio Corp. by Brian Belanger ............ 1 glue rather than screws, less expensive wood types, Evolution of the Hearing Aid by Ludwell Sibley 8 and fewer coats of lacquer). Some models saved The 6AD6 Magic Eye Tube by Brian Belanger 12 money by eliminating the dial glass. Aerials Are Unnecessary? by Brian Belanger 13 The Wirt AC Voltage Regulator by B. Belanger 14 In the mid-1930s the company used louvers behind the speaker grille in some models to enhance sound Classified Ads……………………...………………15 quality. MAARC Your Calendar! .................. …………....16 (Text continued on page 7) Radio Age December 2020 Attend MAARC’s virtual meetings during the pandemic page 3 December 1924 Radio Broadcast Radio Age December 2020 Visit MAARC’s web site at www.maarc.org page 4 Midwest’s 20-tube chassis advertised in the 1938 Catalog. Radio Age December 2020 Attend MAARC’s virtual meetings during the pandemic page 5 Examples of console cabinet offerings from the 1938 Midwest catalog. Radio Age December 2020 Visit MAARC’s web site at www.maarc.org page 6 (Text continued from page 3) For a new technology as complicated as television, that service provided set owners with some comfort. A 1938 Midwest catalog bragged about special Midwest’s catalogs included TV antennas, but you features. That year their high end models featured a would have to install it yourself, and many customers volume expander. (Crosley’s more expensive models were probably not eager to climb up on their roofs. also had that feature.) Midwest offered motor-driven tuning, but Zenith and others did too. Wards’ Airline Since many radio models of that era had a phono jack, brand offered their “movie dial” projected onto a Midwest’s 1950 Catalog A offered the money-saving screen, and Midwest’s 1938 models also had a “movie “Television Adapter” console (shown on this page) for dial” that projected the shortwave band onto a screen.
Recommended publications
  • Anchorage Amateur Radio Club Next Meeting November 4Th
    Volume 34 No. 11: November 2005 Anchorage Amateur Radio Club Next Meeting November 4th Program for November communications support for this race since its inception in Jim Wiley, KL7CC 1973. Lee Wareham, KL7DTH, will speak about his adventures Gordon Hartlieb AL1W has again volunteered for the Start flying from Alaska to Norway and back over the pole in his Communications Coordinator and need over 35 Hams for the Cessna 185 - this is the adventure where Ron Sheardown lost 4th of March 2006. his Soviet built AN2 biplane through the ice. I saw the presentation a few years ago, just after the event, and it was Jim Bruton KL7HJ has volunteered to replace Dan O’barr absolutely fascinating. KL7BD as The Re-start Coordinator as Dan’s new job does not allow for the time required for this job. He will need more Lee has some audio tapes excerpts of the conversations on the than 35 hams for the “real” start on the 5th of March 2006. ham radio (between himself and Jerry Curry, KL7EDK, in Fairbanks), which kept up continuously for the whole flight, Kristin Young, (a poor unguided non ham) is the HQ across and back. There will be time for questions. coordinator and is in need of 144 volunteers to fill HQ shifts of which 33 are Ham required. This is a 24/7 operation with +++++++++++++++++++++++++ 6hr. shifts from the 2nd of March thru the 21st of March 2006. Bernadette Anne, (another poor unguided non ham), is the Trail Communications Coordinator and has 48 positions to fill of which 24 are Hams, 6 more than last year.
    [Show full text]
  • Unusual Tubes
    Unusual Tubes Tom Duncan, KG4CUY March 8, 2019 Tubes On Hand GAS-FILLED HIGH-VACUUM • Neon Lamp (NE-51) • Photomultiplier • Cold-cathode Voltage (931A) Regulator (0B2) • Magic Eye (1629) • Hot-cathode Thyratron • Low-voltage (12DY8) (884) • Space Charge (12K5) 2 Timeline of Related Events 1876, 1902 William Crookes Cathode Rays, Glow Discharge 1887 [1921] Hertz, Einstein Photoelectric Effect 1897 [1906] J. J. Thomson Electron identified 1920 Daniel Moore (GE) Voltage Regulator 1923 Joseph Slepian Secondary Emission (Westinghouse) 1928 Albert Hull, Irving Thyratron Langmuir (GE) [1928] Owen Richardson Thermionic Emission 1936 Vladimir Zworykin Photomultiplier (RCA) 1937 Allen DuMont Magic Eye 3 Neon Bulbs • Based on glow-discharge (coronal discharge) effect noticed by William Crookes around 1902. • Exhibit a negative incremental resistance over part of the operating range. • Light-sensitive: photo-ionization causes the ionization voltage to decrease with illumination (not generally a desirable characteristic). • Used as indicators , voltage regulators, relaxation oscillators , and the larger ones for illumination . 4 Neon Lamp/VR Tube Curves 80 Normal Abnormal Glow Glow 70 60 Townsend Discharge 50 Negative Resistance 40 Region 30 Volts across Device across Volts 20 10 Conduction Destroys Lamp Destroys Arc Conduction Arc Chart details (coronal) Glow depend on -5 element 10 -20 10 -15 10 -10 10 1 geometry and Current through Device (A) gas mixture. 5 Cold-Cathode Voltage Regulator Tubes • Very similar to neon bulbs: attention paid to increasing current-carrying capability and ensuring a constant forward voltage. • Gas sometimes includes radio-isotopes to reduce sensitivity to photo-ionization. • Developed at General Electric Research Labs by Daniel Moore around 1920.
    [Show full text]
  • $I]RPTI]$ CONIITB$Ioil
    $I]RPTI]$BAilI CONIITB$IOil VOTUMENo. I Third Edition By R. C. EVENSONAND O. R. BEACH . CONf ENÎS - BC-22I Frcqucaty llArtrr SCR-274({57A Scrlar) Tronrmillerc BC-342 Rcccivcr SCR.522 Tro nsmitlcr/Rcceivcr lC.3l2 Rcccivcr TBYlronscaiver BC.348 Rcceivcr PE.l03A Dynomofor BC{l 2 Rodqr Orcillorcopc BC-t0ó8A/l tótA Receiver BC-ó45Tro nrmilîcr/Rccclvcr EleclronicsSurplus Index BC-9,1óReceivsr Cross Index of A/N Vacuun Tubec SCR-274(4534 Serier) Rccrivcn PREFACE Since the beginning of the "surplus eratr a real need has existed for a publication devoted entirely to the conversion information necessary to permit practical use of surplus equipment. The amateur radio operator has had especiar need for such a pubrication. The authors have endeavored to fulfil that need in the fo'owing pages by compiling the necessary in- structions and diagrams for the practical conversion of a number of the most popular items of surplus equipment. Theory of circuit operation has not been incruded in this manuar so that conversion data on the largest number of equipments could be in- cluded. It has been assumed that those persons interested in a manuar of this nature are generarly familiar with the operation of erectronic equip_ ment. It should be noted thatthe operation of any radio transmitting equip_ ment, including that described herein, requires the issuance of both an operator's license and a station license by the Federal communications Commission. Th-eauthors regret that time does not permit them to engage in individuar correspondence regarding these or other surplus items, and the publisher has been requeste-anot to forward retters.
    [Show full text]
  • Super Stealth SE Monoblock Contains a GZ34/5AR4 Rectifier Tube, but Any Pin-Compatible Tube with Direct Or Cathode Heating Can Be Used
    SSuuppeerr SStteeaallltthh SSEE I don‟t consider myself an audio specialist, nor an audiophile. I‟m an audio amateur who simply enjoys good music reproduction. I also recognize that listening to audio is a matter of personal choice. Furthermore, I rarely express my opinion, like everybody seems to do nowadays through Facebook or Twitter. Often too much information kills the information itself, but writing the following review appealed to me. I spent years, and much money, listening to different audio equipment, including some famous brands that were way more expensive than any MAD (Mapletree Audio Design) products. I always knew what I was looking for in terms of audio, but never really found any music set up that could please my ears in a satisfactory way. My mainstream equipment is a tube based sound system, in a stereo configuration, coupled with a pair of high efficiency speakers. Do I, after all, come close to reaching my audio Nirvana: do I have dynamic sound, while retaining some sweetness characterization? Well, we‟ll see. Among the audiophile community, SET amplifier types are hugely regarded. I had both 2A3 and 300B stereo amplifiers, in a single ended triode connection. They were really good pieces of equipment. However, it always seemed to miss something like dynamics or punch. One day, I had the opportunity to listen to the previous version of Stealth monoblocks made by MapletreeAudio. They had 12AU6 tubes, and I was amazed by the sound produced. The owner of these monoblocks told me that they are “ultra linear” monoblocks. I remember having heard that ultra linear amplifiers can sound really good.
    [Show full text]
  • "Lessons in Electric Circuits, Volume III -- Semiconductors"
    Index α ratio, 210, 264 Beam power tube, 474 β ratio, 186, 264 Bel, 8 10-50 milliamp signal, 379 Beta ratio, 186, 264 4-20 milliamp signal, 379 Beta ratio, bipolar transistor, 479 4-layer diode, 322 Beta variations, 187 741 operational amplifier, 361 Bias current, op-amp, 398 Bias, BJT, base, 235 A-weighted dB scale, 14 Bias, BJT, calculations, 235 A/D converter, 365 Bias, BJT, collector-feedback, 236 AC-DC power supply schematic, 333 Bias, BJT, emitter, 237 Active device, 3 Bias, BJT, voltage divider, 243 Active mode, transistor, 183 Bias, diode, 98 Alpha ratio, 210, 264 Bias, transistor, 195, 222 Amplification, definition, 3 Bilateral, 294 Amplifier, differential, 357 Bipolar-mode MOSFET, 314 Amplifier, inverting, 371 Bistable, 389 Amplifier, noninverting, 371 Brattain, Walter, 60, 65 Amplifier, single-ended, 357 Breakdown, diode, 102 Analog-to-digital converter, 365 Breakdown, transistor, 327 Angular Momentum quantum number, 33 Breakover, thyristor, 327 Anti-static foam, 287 Bridge rectifier circuit, 111 Antilogarithm, 10 Bridge rectifier circuit, polyphase, 111 Artifact, measurement, 450 Bypass capacitor, 261 Astable, 391 Attenuator, 16 Calculus, 360, 386, 438 Attenuator, bridged T, 21 Capacitance, diode, 108 Attenuator, coaxial, 23 Capacitor, bypass, 261 Attenuator, L, 21 Capacitor, coupling, 231 Attenuator, PI, 20 Capacitor, op-amp compensation, 404 Attenuator, rf, 23 Cascode amplifier, 218 Attenuator, T, 19 Cat-Eye tube, 486 Avalanche photodiode, 153 Cathode, 471 Averager, 380 Cathode Ray Tube, 485 Center-tap rectifier circuit, 109 Band, electron,
    [Show full text]
  • AFT MONTHLY to US Llop Model 546 3" Cathode 1 Ray Oscilloscope $6.50 Down -$5.95 for 'Om °Nthe.$59.95 FATELE Cash Pria
    OVER 175 ILLUSTRATIONS _ SHORT-WAVE RADIO FOLLOWS THE RACES! Short -Wave Radio in 1937 - How to Make the "Short -Wave Special" How the "Radio Piano" Operates - Fun with Short -Wave Apparatus OVER 50,000 RADIO MEN READ RADI , AFT MONTHLY to US llop Model 546 3" Cathode 1 Ray oscilloscope $6.50 down -$5.95 for 'Om °nthe.$59.95 FATELE Cash Pria. 4007. V/lilA! SFBV/ll/N5will increase YOUR profits! HERE ARE THE 6 REASONS! 1. Visual Alignment- Signal Only by using this type equip- $6.00 dòß ment can R. F. and I. F. circuits $5.44 for on modern, high fidelity receiv- months o n ers be properly aligned. C. terms. P<<á $54.95 2. Audio Response- Only by using this type equip- ment can over -all audio re- sponse and'''sstsagr -by- stage" -a analysis measurements be made quickly and accurately in both receivers and P.A. or theater amplifiers. ALL visual servicing is not alike! That's why you should demand proof of its accuracy and profit -making ability- before you buy! 3. Hum Check- Shown here are six profitable short-cuts that not only allow you to do Only by using this type equip- service work more quickly, but more efficiently! They are only a few of ment can objectionable hum be the many dozens of uses to which you can place your Supreme Model quickly traced and eliminated. 581 Signal Generator and your Supreme Model 546 3" Cathode Ray Oscilloscope -the perfect instrument combination for Visual Servicing because they were both designed to work together! 4.
    [Show full text]
  • Ctg Product List
    Product List Crestwood Technology Group 914.779.3500 | [email protected] CTGNOW.com Any part, any platform, we can help. Here is a quick overview of parts and material we provide. Expendables Rotables ATA Chapters Actives INTEGRATED CIRCUITS Batteries Actuators ATA Chapters AC to DC Switching Converters Bonding Leads Air Regulators Accessory Gearboxes Analog Cable Assemblies APUs Air Analog – Digital Converter Connectors Ballast Units Air Conditioning Angular and linear Position Sensors Contacts Boroscopes Airborn Auxiliary Power Appdlication Processor and SOC Fans Cargo Liners Auto Flight Audio Processor Fasteners Cargo Nets Central Maintenance System Controllers Filters Cargo Panels Communications Converters Hardware Cockpit Avionics Doors CPLD Inductors Composites Electrical Power CPUs Lamps/LEDs Compressors Engine Controls Current miters Placards/Decals Disks Engine Exhaust Current Mode PWM Controller Relays Displays Engine Fuel and Control Current Sensor Tape Doors Engine Indicating DC to DC Controller Drive-Shafts Engine Oil Digital Elevator Assemblies Equipment / Furnishings Consumables Digital – Analog Converter Engine Components Fire Protection D-RAM Engines Flight Controls Adhesives, Tapes & Sealants DSP Evacuation Slides and Life Fuel Solvents EE-PROM Rafts Fuselage Composite Materials EPROM Fire Extinguishers Hardware Shop Supplies FPGA Flap Carriages Helicopter Vibration Oils, Greases & Lubricants Hall Effect Sensor Fuel Pumps Hydraulic Power Paints & Coatings Hot Swap Controller Gear Box Ice and Rain Protection Industrial
    [Show full text]
  • 1992-01: Vintage Radio Receiver Design
    When I Think Back... by Neville Williams Vintage radio receiver design - 6: Pentagrid converters, diode detectors and AGC 4 Once /5-valve superhets, as described in the November issue, had identified and established the prime suburban receiver market, manufacturers sought to devise ways and means of attracting buyer interest to their respective products. Some such measures were mainly cosmetic in the way of cabinetware and controls; others had to do with on-going circuit design and performance. As indicated in the November article, converter also employed a comparable coil L2 via the usual grid capacitor and the single most troublesome aspect of the concentric electrode structure. But in this grid leak. Note that the latter returned 4 first wave of /5-valve superhets was case there were five grids between directly to cathode, so that the only bias probably that of gain — or volume — cathode and anode — so arranged that would be that resulting from the oscil- control. It came about because the IF they could perform the dual function latory grid current — typically between amplifier stage was the only one avail- more flexibly than the existing autodyne 0.2 and 0.5mA. able for, gain control, and the range of ad- concept. Grid 2 served as the oscillator anode, justment was simply not sufficient to Fig.1, from an early RCA Receiving and connected through the oscillator embrace both maximum gain for weak Tube Manual, depicts the electrode struc- feedback winding L3 to an HT supply signals and minimum gain for powerful ture and the pin connections of the voltage in the range 100-200V.
    [Show full text]
  • Practical Circuits
    ...-_,100-cRAFTLIBRARylv.014 Iff gr PRACTICAL RADIO r CIRCUITS A Comprehensive Guide to All Types of RadioCircuits for the Service Man, t Constructor and Experimenter vi by David Bellare 4 pUlE3L.ISHIED MAFTPUBLICATIONS, tkPiDgg C HUDSONST ...NEW vs,IP' 'Vor Here's the Greatest Book for Service Men! OFFICIAL RADIO SERVICE HANDIBOOK By I. T. Barnsley HERE'S the book on radioservicing that con. tains everything Service Men must know.The book, OFFICIAL RADIO SERVICE HANDI. it BOOK, is edited by J. T. Bernsley, foremost radio service authority.This 1936 service guide is the only book ofits kind-its editorial materialisso well prepared that the technical information can be understood by even beginnersinradioservicing. Every page contains new material, new illustrations -no reprinted literature. The OFFICIAL RADIO SERVICE HANOI, BOOK covers thoroughly over 500 radio topics.It tellsyou howtoanalyzethelatestcommercial receiver circuits; how to really make money servicing midget sets; and, how aligning supers can be made easy.Itstresses the many uses of different types of test equipment; itgives you short cuts in trou- bleshooting and repairing; and, contains over 250 pagesofoperatingnotes on1,000 manufactured receivers.So up-toclate is the OFFICIAL RADIO SERVICE HANDIBOOK that it explains thoroughly the features and innovations in the most modern of receivers. OVER 1,000 PAGES Over I,0 0 0Illustrations. Beautiful, Gold -stamped Linden Cover, 6x9 Inches OVER 250 PAGES OF PARTIAL CONTENTS OF THIS GREAT BOOK! OPERATING NOTES PART I-CIRCUIT THEORY AND ANALYSIS R.F. Fundamentals; Superheterodyne Receiver Theory; A.V.C. and Tuning Whether itisa fading IndicatorCircuits;A.F.Fundamentals; Power Supply Theory and Circuits; job,lack of sensitivity, Speakers, Reproducers and Pick,Ups; Commercial Receiver Circuits of All Types; noise within the receive How to Analyze.
    [Show full text]
  • Superior TV-11
    a HOw TO GEIIHE ilOSTOUT OFYOUR ModelTV-ll a IAATIIN CI.IFFORD s.nior l.nt!.r.t, xndio f.l.vhbn tninins arn, INTRODUCTION From an appeara$ce viewpoint, your tube tester is without a doubt the most complicat€d test apparatus you have in your pos- session, Containlng far more limobs, controls, levers, srr'itches, and sockets tJran any m\rltitester, vacuum-tube voltmeter, or oscilloscope, the operating panel oI a tube tester can sometimes Ieave even an experlenced technician with a feeling of frustration. Despite it6 appearance, a tube tester is easier to operate than any oI the instrum€nts we havenamed above, -iIE--dvaaugewithout exception. A multimeter or slgnal generator may have o-f single-knob eontrol, but do not let this deceptively simple facade Iool you lor a moment. A multitester requires that you have at least an understanding oI the fundamentals of electricity, The use which you get out oI such an instrument is in direct proportion to your own electronic ability. With the right kind and amount of Ioowledge, even a balky, contrary, complicated television set must yield to the skill oI the techdcian who knows ho\r to get t}Ie most out oI his multimeter or signal generator. These latter-named instruments are all versatile, They carl, depending upon the loow-how of the operator, be made to do innumerable jobs, far over and above their normal operating requirements. But what about a tube tester? Here we have an instrument tiat does not depend upon skill or a vast background of electronic knowledge.
    [Show full text]
  • Universal Magic Eye VU-Meter Aufbauanleitung • Assembly Manual Herzlichen Glückwunsch Zum Erwerb Dieser Unvergleichlichen Aussteuerungsanzeige
    Aussteuerungsanzeige mit Magischem Auge • Magic Eye VU-Meter Universal Magic Eye VU-Meter Aufbauanleitung • Assembly Manual Herzlichen Glückwunsch zum Erwerb dieser unvergleichlichen Aussteuerungsanzeige. Congratulations for purchasing this excellent Magic Eye VU-Meter. Um Erfolg beim Zusammenbau garantieren, ist die Beachtung einiger Grundregeln unbe- For successful assembly of the this kit please read the following helpful hints. dingt erforderlich. • This kit is designed for someone who has advanced solering skills and experience with • Dieser Bausatz richtet sich an den fortgeschrittenen Bastler. Erfahrungen in der Elektronik assembling electronics. sind hierbei unerlässlich. • If you believe that the kit is too complicated for your skill level please do not try to assemble it • Wenn Sie merken, dass der Bausatz für Sie zu kompliziert ist, versuchen Sie bitte nicht, ihn - this generally ends up with a device that is not repairable and results in you being very „zusammenzuschustern“. Dies endet in der Regel in einem nicht mehr reparablen Gerät. Bitte frustrated. Please contact the provider and they can offer you other options that will end in a wenden Sie sich so früh wie möglich an den Anbieter, der Ihnen Hilfestellung geben kann. more fulfilling result! • Bitte nehmen Sie mindestens 1-2 Stunden Zeit. Einen Bausatz in Hektik zusammenzulöten, • Take your time - this kit should take 1 hour to complete if uninterrupted. Assembling the kit in erzeugt letztendlich nur Frust – und die Fehlersuche dauert hinterher „ewig“. a hurry will lead to frustration and the troubleshooting takes three times as long. • Ihr Arbeitsplatz sollte sauber, aufgeräumt und gut ausgeleuchtet sein. • Ensure your work area is well lit (daylight preferred) and clean.
    [Show full text]
  • Vacuum Science & Technology Time Line, 1500–1799
    Vacuum Science & Technology Time Line, 1500–1799 Time Line Color Code Key Related scientific developments Anders Celsius Vacuum devices (1701-1744) Radio & electronics Mayow Apparatus ca. 1669 suggests new temperature Otto von Guericke scale. This scale is revised Historical events Magdeberg hemisphere John Mayow (1641-1679) Rene Descartes in 1745 by Carl von Linn¾ (1707-1778) Vacuum gauges demonstration suggests that air may be (1596-1650) 1654 made up of two different gases 1742 Vacuum pumps in his Principa Philosophiae Experiments by Richard 1674 suggests that a vacuum Captions Townley (1628-1707) and Jakob Hermann cannot exist Vacuum device manufacturing Henry Power (1623-1668) (1678-1733) 1644 establish PV law for expansion postulates that pressure is (later called Boyle’s Law or proportional to density and Marriotte’s Law) to the square of the average Ferdinand II, 1660 velocity of the particles Grand Duke of Tuscany, in motion invents liquid-in-glass 1716 thermometer In response to Boyle’s ideas, 1641 Franciscu Linus (1595-1675) Otto von Guericke’s suggest the properties of a air pump vacuum is due to invisible thread-like Hero of Alexandria writes 1672 “funiculus” that strive to hold Pneumatias summarizing nearby objects together what is then known about Evangelista Torricelli 1660 syphons, pumps, etc. (1608-1647) Johannes van Helmont ~150 B.C.E. Substitutes mercury for George Ernts Stahl defines “gas” (Flemish = chaos) water in overhead pump introduces idea of to mean an air-like substance 1644 phlogiston as the 1620 agent of
    [Show full text]