RAN Technology

"A Pair of 6V6s"


Vintage Audio 0 Comments 12/03/2018 

What more does one need to hear good audio?

Posted By: Robert Nickels (ranickels)

The first audio amplififer I made (that worked) used a single 6V6 to amplify the output of a regenerative receiver.    Ever since they've been my idea of what a good audio tube should be and with a big speaker mounted on a piece of plywood, a 6V6 will produce "room filling volume" as the magazine articles fo the day said.   But as my music tastes grew acoustic-suspension speakers and a solid-state amplifier capble of driving them took center stage.

But as is often the case, returning to our roots can be fun, as was the case when I restored a little hi-fi amp using not one but a pair of 6V6s - the model 2122 made by Bell Sound of Columbus OH.   After cleaning and recapping it sounded great, but would not make a good mate for inefficient speakers, but another trip into the storage are solved that.   A  $5 flea-market find, a Knight KN-800 12" coaxial speaker mounted on a piece of plywood that might have once been mounted in someone's rec-room wall, as was the custom at the time.   Allied Radio sold their own linke of speakers with the Knight brand (online rumors suggest they were made by Jensen) as a lower-cost alternative, but they were good speakers and quite popular.   The KN-800 sold for $45 ($370 in today's dollarettes) and the Bell 2122 went for around $55, so an Eisenhower-era audiophile would have close to a grand invested in his modest 10 watt system.   But 10 watts is plenty of power to drive an efficient speaker, and while my KN-800 sounded a little thin by itself, I found that it fit underneath one of my benches like it was made for the space, and the additional air volume behind it produced a nice improvement in the bass response.

Knight called this speaker the "Best fat the Price!" and I can't disagree.     Now you can't go buy a Knight kit from Allied but you can buy them on eBay for under $100, and one of the versions of the Bell 2122 for about the same amount, so it's pretty affordable to take a stroll down memory lane, listening to "historic mono" on a pair of 6V6s!

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

  

The Pioneer 530

made by JAARS for Wycliffe Bible Translators
Category: Vintage Ham Radio
In 1917 a missionary named William Cameron Townsend went to Guatemala to sell Spanish Bibles. But he was shocked when many people couldn’t understand the books. They spoke Cakchiquel, a language without a Bible.   He believed everyone should understand the Bible, so he started a linguistics school (the Summer Institute of Linguistics, known today as SIL) that trained people to do Bible ...  READ MORE
- Robert Nickels (ranickels),  07/02/2022 
    Visitors to the Elgin National Historic area along the Fox River in Elgin Illinois may not realize they are at the site of a famous shortwave radio station - W9XAM - the time signal station operated by the Elgin Watch Company.Elgin was the only watch company maintaining an observatory that observed, recorded and broadcasted time from the stars correct to the hundredths of a second. Located a...  READ MORE
- Robert Nickels (ranickels),  05/09/2022 
  

The Mosley Commando II

Made in England and scarce even there
Category: Vintage Ham Radio
The Mosley CM-1 receiver is quite well known and not especially hard to find in the US even though it was the only radio produced by the company that has been well-known for antennas since 1939.   Or is it...?A full-page ad (advert for you on the other side of the pond) appeared in the RSGB Bulletin in 1963 for a nice looking and very capable SSB transmitter called the "Commando II&...  READ MORE
- Robert Nickels (ranickels),  04/15/2022 
   I'm not ready to publish a description of exactly HOW it works, but 20 minutes effort with scissors and tape produced a prototype  Droplet Energy Generator that allows me to say for sure that IT WORKS!I duplicated the design shown in this video.   I wrapped a scrap of plastic in aluminum foil, then applied a strip of double-sided tape and to that attached a piece of PTFE thread-...  READ MORE
- Robert Nickels (ranickels),  03/30/2022 
   When I was first licensed in the 1960s in Nebraska, two groups of hams were commonly heard on the air before those with jobs got off work - other teens like me and the disabled hams.   Some of my earliest Novice ham buddies were blind students at the Nebraska School for the Blind in Nebraska City, and there were many other visually-impaired hams, all of whom were exceptional operators, e...  READ MORE
- Robert Nickels (ranickels),  03/21/2022 
   Old style mica capacitors were used in the pi-net matching sections of several vintage transmitters and the combination of age, heat, and high RF currents have made them likely failure items.   My Collins 32V-2 transmitter was to the point where it would not properly load to full power on 75 meters so something had to be done.   Mica capacitors are no longer made but fortunately new...  READ MORE
- Robert Nickels (ranickels),  03/19/2022 
   I found myself wanting to convert various frequencies to other frequencies and wanted a cheap and easy solution, so I designed a simple "universal converter" using the NE-602 and a programmable oscillator from Epson.  I'd used the same combination in hundreds of "RANVerter" SDR Upconverter projects since my Dec. 2013 QST article and knew that while there were limitatio...  READ MORE
- Robert Nickels (ranickels),  03/17/2022 
   It's always a challenge to hold PC boards during assemly and testing.  After purchasing a magnetic holder from Amazon  I realized I wanted more and could easily make as many as I wanted using inexpensive 3 mm hardware from eBay and some strong "fridge magnets".     All that's needed is to epoxy a standoff to the magnet - both tapped and threaded ...  READ MORE
- Robert Nickels (ranickels),  03/09/2022 
   The Si5351 has been the biggest boon to homebrewers since the invention of the NE-602, especially now that quartz crystals are essentially obsolete.   But it's redundant to run the output of the 5351 through a johnson counter to develop the quadrature signals required for QSD/QSE SDR front-ends when there are three clock outputs available and the IC allows for phase offsets. &nb...  READ MORE
- Robert Nickels (ranickels),  03/09/2022 
   It's pretty well accepted that the Pacemaker was not EF Johnson's finest effort.   In fact it was the first of several failed attempts by the King of the AM Transmitters to make the transition to SSB.    In the end, it was the rise of CB popularity that kept the company viable, along with its component business, while their ham business gradually faced away. &...  READ MORE
- Robert Nickels (ranickels),  03/03/2022 

VIEW News Item

Announcing the W9DYV Radio Society

honoring SSB pioneer Wes Schum W9DYV
VIEW News Item

Hamfests Return!

A quick look at the Wauseon OH swap on June 6, 2020
VIEW News Item

Making A Transistor Radio

in memory of Rev. George Dobbs G3RJV (SK)
VIEW News Item

Wes Schum, Amateur Radio's Unsung Hero

new book released, available on Amazon
VIEW News Item

Soviet Spy Radio found in forest

(oh yeah, I put that there...I'll take it now thanks!)

(There are currently no Blogs.)