RAN Technology

Elvis Mic fix


Technical 0 Comments 01/13/2022 

Shure 55 that is...

Posted By: Robert Nickels (ranickels)


How'd it get that name?  The photo pretty much says it all...

One of mine had a problem - the guts could be heard rattling around loosely insdie.  The "capsule" as it's called nowadays at least is held in position by three rubber "socks" that fit over metal tabs to provide acoustic isolation from the mounting provisions in the housings.  Not surprising after all these years, the rubber had deteriorated to dust, allowing the metal tabs to rattle around loosely.   See the images below to see what the "socks" look like and my solution.

A 3/8" rubber grommet is a tight fit but to my surprise when stretched over the capsule tabs fits perfectly into the housing.   The rubber is harder so the acoustic properties may not be the same but for a few cents and minutes, it's a great fix!

I also noticed the output of this mic like others was intermittent electrically.  This was due to the impedance selection switch, which is in the ground side of the mic circuit.  Since I have no interested in anything other than high impedance output, I just run a short ground wire from a mounting screw to the green wire connection at the bottom of the mic element, problem solved forever!   

For a lot more about the "Elvis Mic" aka the Shure 55S, please check out Scotty Moore's site    Yes, THAT Scotty Moore!   The guy who played guitar for Elvis from 1954 through 1968 - a guy who ought to know!

Click on the image title or on the image itself to open the full-sized image in a separate window.

  

The 8122 Story

with thanks to K9AXN and W6MTF
Category: Technical
The following information is attributed to Jim Liles, K9AXN.  Jim a long time user and expert on the Hallicrafters SR-2000 "Hurricane" with involvement going back to it's original production.   His website www.k9axn.com contains a lot of valuable information and is recommended.  RCA developed the 8122 which was also built by Burle, and later, Eimac (as you wi...  READ MORE
- Robert Nickels (ranickels),  01/22/2022 
  

My Johnson "Five Hundred Desk" Story

"it's about the journey, not the destination..."
Category: Vintage Ham Radio
Not a lot is known about Jacob C. Thomas, other than he was born in 1903 to John and Anna Thomas in David City Nebraska, and died just a few months short of his 90th birthday in the same town.    And that he was a radio man.David City is a small town of 3,000 not far from my home town so it made sense that the auction notice would appear in the local newspaper where my Dad would see...  READ MORE
- Robert Nickels (ranickels),  01/22/2022 
   Having grown tired of seeing this rare and somewhat incredible receiver sitting on the shelf, unusable due to slipping dial belts, I bit the bullet and tore it apart to begin restoration.  The quote above comes from Tom Rousseau K7PJT's article in Electric Radio on the PRO-310 and boy, is he spot on!Since I will be depending heavily on what he and others have written about this receiver, ...  READ MORE
- Robert Nickels (ranickels),  01/14/2022 
   Elmac aka Multi-Elmac was actually the Multi-Products company after tube maker Eimac complained that their original name was too confusing.  Most hams just call them Elmacs anyhow!The company was started by Cletus Collum in 1947 to commercialize his design of a radio-controlled opener for garage doors and gates.  That product still lives on through the Stanley Company and it's succes...  READ MORE
- Robert Nickels (ranickels),  01/13/2022 
  

The way it was

when HAMS ran electronics companies
Category: Historic
We hear a lot about "tech giants" nowadays but there were tech companies back in the 50's and 60's that were run by actual techies...no offence to those today who can write code, but when most of us think "tech" we think of circuits and metal chassis and solder fumes. An interesting example comes from the files of the Hallicrafters SR-2000 "Hurricane" whi...  READ MORE
- Robert Nickels (ranickels),  01/02/2022 
   Meck, Telvar, Audar -  three names for the same company's products.The John Meck company of Plymouth IN made exactly one amateur radio product: the T-60 transmitter. It was sold under the name Meck as well as Tevlar and based on a limited sample, they are nowhere near identical. The T-60 did not sell well and was only offered for a year or two. Among the reasons for this may have been the...  READ MORE
- Robert Nickels (ranickels),  12/16/2021 
    Looking for a tool?   Important papers?   Parts you just had your hands on minutes ago?   ...  READ MORE
- Robert Nickels (ranickels),  12/04/2021 
     Among it's early products, the Multi Elmac Company of Oak Park MI made marine band radios and other products for boats, including the Sea-Deep DM-1 depth indicator, the Sea-Fume SF-1 vapor detector, and the BC-1 Duo-Charger for 6 and 12 volt batteries.   Thus it's not surprising that the marine radio-telephone would be given a "sea" name:   the Sea...  READ MORE
- Robert Nickels (ranickels),  11/05/2021 
   The Sonar Radio Corp.  of Brooklyn NY is a well-known manufacturer of Ham, CB, and Marine Band radios over a period of several decades, and it's products were always well engineered and of good quality.    But despite several attempts, it's ham radio products never really managed to excite hams enough to plunk down their hard-earned cash.   The SRT series of t...  READ MORE
- Robert Nickels (ranickels),  11/01/2021 

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