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Color artwork of the Grebe MU-1 from the advertising brochure For decades, vintage radio collectors have rated the Grebe Synchrophase MU-1 as one of the best, if not “the best,” Battery-operated TRF-Neutrodyne radio receiver from the mid s, with performance that is matched with timeless styling. However, anyone that has taken a close look at more than a few Grebe Synchrophase MU-1 receivers has surely noted that there are some significant differences between the various MU-1 receivers produced. This article will attempt to catalog as many upgrades as possible with explanations as to their purpose. This article will also assign a chronological order to the upgrades so the Synchrophase owner might be able to date when his radio was built from certain easily observable construction details. Also, we will attempt to decipher Grebe’s serial letter methods so that dating by this combination of letters may become possible in the future this attempt has actually produced another interesting possibility for the serial letter codes. A serial letter log has been started and this article will keep track of the information in that log.

GE MOBILE RADIO HISTORY

The tube charts are not very useful for determining the circuit model. At the Fender factory they used old tube charts when new models came, probably because the tube layout was the same. Determining production date by serial number and transformer codes is better, and you should also inspect the circuit to be completly sure.

The Commodity Codes Search page lists all NIGP commodity codes and is searchable.

Get daily updates directly to your inbox Subscribe Thank you for subscribingSee our privacy notice Could not subscribe, try again laterInvalid Email Cambridge saw a significant increase in the average salary during , and has now been named the best-paid place in the UK outside of London. The good news doesn’t end there, as the research by Adzuna found that Cambridge salaries are rising at a faster rate than in the capital, with a 3. Unsurprisingly, Cambridge has also had the highest increase within the surrounding regions, with the 3.

The data presented by Adzuna was collected from 56 major towns and cities across the UK between December and December When it comes to job vacancies, it should be no surprise that London was ahead of the pack – by over , roles. There were , vacancies across the month period in the capital. Cambridge was in sixth place with 10, vacancies. We were deprived of a place in the top five by Manchester 28, vacancies , Birmingham 19, , Leeds 16, and Bristol 16, You can keep up to date with all the latest news in and around Cambridge by downloading our free app.

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BF/SF Bassman

Chinese names starting with Xi like Xiaomi or Xinjiang. In abbreviations, it can represent “trans-” e. XL for extra large, XOR for exclusive-or.

SX Chassis H The photo right is H, a mid production SX, showing the typical chassis layout. Of note is the power transformer which has the standard Hallicrafters’ “h” embossed on the cover.

The source-date code on a pot is a 6 or 7 digit code impressed into the casing of the potentiometer. For speakers this code can be 5, 6, 7 or 8 digits long, and it’s ink-stamped or paint-stamped on the “bell housing” of the speaker. In either case, the code works the same. The first 3 digits on a pot, or the first 2, 3 or 4 digits on a speaker are the source or manufacturer code. The remaining 3 or 4 digits are the date code. In 3 digit dates code, the 1st digit is the last digit of the year.

On 4 digits date codes, the 1st and 2nd digits are the last two digits of the year.

Superior Music

Part One, – Introduction; Prewar Equipment General Electric was an already well established manufacturer of a broad spectrum of electrical and electronic material when it decided to enter the land mobile police radio market in GE’s initial land mobile radio products were mobile and motorcycle receivers for the AM medium frequency police channels in the and KHz bands, and in the early ‘s the company branched out with an experimental VHF AM two way set, using a super-regenerative receiver, but which was more or less a toy rather than a serious police tool.

Inevitably, there will be “holes” in data coverage in any project like this, and I do not have enough information, manuals or examples of equipment to make this page an absolutely complete reference. For example, I do not have photos or detailed descriptions of the motorcycle and mobile equipment made by GE prior to , other than that below, so while mentioned here, it is not covered in any detail.

World War I The last Coventry soldier to die on the last day of World War One His name was Horace McKnight. He had survived until the very last day of the war. He would not live to see another.

Return to the Main Index. Sometimes there just isn’t enough information on electric instruments and amps to allow them to be properely dated. And many people ask me to try and determine the year of their old amplifier, or to help them with the year of their older off-brand electric guitar. Since I primarily collect amps by Fender, and guitars by Gibson, Fender, Martin, National, Epiphone, Gretsch and Rickenbacker, I really can’t help them with these other less popular brands.

As you have probably noticed, there is plenty of information here to help date the brands that I am interested in. But where does that leave everyone else? Well I’m not one to leave you out in the informational cold, so here’s something that I use quite often in dating amplifiers and electric guitars. It’s called the “source-date code”, and it can help determine the approximate age of an electric instrument by the date its components were manufactured.

Source-Date Codes On American made vintage gear, the pots and speakers provide an excellent opportunity to date a piece of equipment by referencing their “source-date code”.

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Share this article Share Scheduled to be completed by , the current robot is 4. In tests, the small shape-changing robot pictured folded itself into a functional machine that could walk and turn without human help. But unlike the popular Transformers toys – robots that disguise themselves as cars and trucks – the device is not aimed at children but rather for other applications like search and rescue operations. Their next goal will be to create a half-scale model, 8. The robot, which weighs 77lbs 35kg , was unveiled at the annual Digital Content Expo in Tokyo on 23 October

Fender Tube amp codes: – (look for a 2 letter code stamped on the tube chart inside the back of the amp)- the first letter is the year, and the second letter is the amp stamped NA would have been made in Jan. of Here is a list of the first letter showing the year of manufacture.

See Article History Alternative Title: The telephone is inexpensive, is simple to operate, and offers its users an immediate, personal type of communication that cannot be obtained through any other medium. As a result, it has become the most widely used telecommunications device in the world. Billions of telephone sets are in use around the world. Alexander Graham Bell, who patented the telephone in , inaugurating the 1, km mile telephone link between New York City and Chicago on October 18, In addition it describes the development of what is known as the public switched telephone network PSTN.

For discussion of broader technologies, see the articles telecommunications system and telecommunications media. For technologies related to the telephone, see the articles mobile telephone , videophone , fax and modem. Within 20 years of the Bell patent, the telephone instrument, as modified by Thomas Watson , Emil Berliner , Thomas Edison , and others, acquired a functional design that has not changed fundamentally in more than a century. Since the invention of the transistor in , metal wiring and other heavy hardware have been replaced by lightweight and compact microcircuitry.

Such advances supplement, but do not replace, the basic telephone design.

14 famous works of art with hidden images

Fiction Titans Return marketing material When the universe was still forming, before Autobots or Decepticons existed, the giant spaceship robots known as Titans were created and sent out to discover the powers and mysteries of the universe. Each Titan was crewed by Titan Masters, tiny robot caretakers charged with up-keeping their systems. The Titan Masters also had a greater purpose: Each had a unique superpower they could grant to other Transformers, a gift intended to forge links with other civilizations they might discover.

The Titans and their crews were eventually forgotten by all but a few power-hungry and entirely unsuccessful legend hunters.

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The progress of this type of work is slow, hence the long hiatus, however, a lot of new data have been collected regarding Fender amplifiers, including production numbers. Advances have been made with regards to the production of tolex amps and it appears that much of this information can be applied to late s tweed amps as well. In addition, the dating-by-serial number tables have been revised and are more accurate.

The bad news is that there is still a lot of work that needs to be done on the silverface amps. Unfortunately, there is some sad news to report as well. Fellow Fender amp researcher, Greg Huntington, passed away June 5, after losing his battle with cancer. Greg kept his illness very private, even from this author. His passing is a great loss to this research team and the Fender amp aficionado community in general.

Greg was passionate about Fender amps and his knowledge, insight and humor will be missed very much. Paul Linden has volunteered to fill in for Greg.

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I promise the tables will still be there after you finish reading. We also received a report of a tweed 5G12 Concert. The 5G12 Concert is the earliest version from very late and early so the existence of a tweed example, while extremely rare, is certainly plausible since Fender was making lots of tweed amps during the same time period. Working at FMI — I was able to interview a fellow who wishes to remain anonymous who worked at Fender in in the amp department.

Although his job was somewhat limited, his recollections provided some really fascinating insights to how the amps were built.

DATING FENDER AMPS BY SERIAL NUMBER, PART VI by Greg Gagliano. Copyright , Vintage Guitar Magazine This article updates information from research started in

From up to , National provided Airways companies with HRO receivers for use at airports and for airway navigation uses. The RCD provided specific airways features like squelch, relay controlled speaker selection and audio bandpass filters and single audio amplifier output sections designed for either Z ohm lines or Z ohm speakers that had internal output transformers. No S-meters, no crystal filters and most importantly, no external power supply.

Undoubtedly, the Airways companies found the HRO, with its numerous idle coils and separate power supply, somewhat difficult to install and maintain. The RCD and its successors were self-contained receivers only requiring a loud speaker or telephones. This station was basically the aeronautical communications to various airplanes providing weather, flight information and other necessary communications to “in flight” aircraft.

Note that there are “banks” of HRO receivers but notice the three receivers near the rear-most operator. The top receiver is the HRO Junior. Date is probably These receivers generally will have a National Audio Output transformer installed in the chassis area behind the S-meter and adjacent to the antenna terminals.

Numerical NAICS Code List

There is no reliable way to date amps other than to ask Fender customer support to look up the date from the serial number, although you may find a date code on the speaker. Early Tweeds The early green board tweed-covered amps were not lacquered. Once again, only the speaker is different. It is not old stock.

DATING FENDER AMPS BY SERIAL NUMBER, PART V by Greg Gagliano. Copyright , 20th Century Guitar Magazine. They said it couldn’t be done Over 6 years in the.

Even after all of this time, modern technology is helping us discover previously unknown “hidden” images concealed in the art. Using art restoration techniques, imaging technology, and even microscopes, art historians have been able to uncover some shocking secrets. People love finding hidden symbols and secret codes in all sorts of objects – including art. It might be common knowledge that Da Vinci was an accomplished musician, but not many people know about the song he painted into “The Last Supper,” using rolls and hands in the place of music notes.

And you’ve probably seen the “Mona Lisa,” but not with a microscope – she has a miniscule code hidden in her eyes. Here are 14 famous works of art that have hidden symbols. This entire painting has a very realistic look to it, until you notice the blob for lack of a better word in the bottom-middle between the the two men.

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