Mr. Schell what a great bit of info, and a great read....thanks!
mf28, you likely have some fine amplifiers there. From what I can see they appear to be homebrew amps from a serious constructor who spent the money for the best parts available at the time. The Altec trannies with the red, white and blue decals date from 1945 to the early 1950s. If they still work well then keep them, as they are likely the excellent design work of Mr. Ercell Harrison.
Work on this basic push pull 6L6 circuit began in the late 1930s at Lansing Manufacturing Company, before Altec Lansing was formed in 1941. Check out this thread and scroll down to read the mind blowing letter from Dr. John Blackburn:
Seeking information on Lansing transformers
Friends of mine own several examples of these early 6L6 amps, some prototype and some production. An expert technician has measured several of the Harrison output transformers and found them to have excellent bandwidth, fully comparable to the best modern designs.
Mr. Schell what a great bit of info, and a great read....thanks!
100 Amplifiers, part 2 , 1945 ? 54
100 Amplifiers, part 2 , 1945 – 54 | Lilienthal Engineering
100 Amplifiers ? Part 3 , 1955 ? 59
100 Amplifiers – Part 3 , 1955 – 59 | Lilienthal Engineering
100 amplifiers ? part 4 , 1959 ? 82
100 amplifiers – part 4 , 1959 – 82 | Lilienthal Engineering
................GC
FWIW, the phillips head screws are not from the 40's, 50's, or most of the 60's.
Likely a 1970's build or later.
Not all vegetables make good leaders.
Bowtie, THANKS !! I'm sure I'm doing something right. ...I should just ask my wife....
I tried to post some of your pics here by hot linking them to the AK site, they worked at first. But, i suspect since they are on the other side of AK's login, probably only registered users who are logged in can view them.
I have to find a new image host, used to use photobucket, however that is no longer reliable.
Not all vegetables make good leaders.
Altec A247a Power amp
Here is the link to an old post of mine.
Might be some info here.
A company called Simplec may have made some of the old Altec amps.
Ron
Enjoying Altec Speakers since 1972
RonSSS, Thanks for the additional info. Lets keep it flowing for those that will follow. I'm sure that there's more gold to be found in them thar hills...
You're welcome, juniper!
As an aside, an early version of the 6L6 power amp was made available on the Lansing Iconic two way monitor speaker beginning in 1939 or so. So it seems the powered monitor speaker dates to the late 1930s. I have seen exactly two of these in decades of scrounging. One amp was sold with a companion Iconic field supply a few years ago to a friend on ebay. The other was on the Iconic owned by the late Les Paul, as documented by this picture of Les in his garage recording studio in Hollywood in the late 1940s:
Les Paul Scroll down about 1/3 page.
By the time the Iconic was sold at the LP Julien's auction in Beverly Hills about five years ago, the speaker had been through a flood and no longer worked, though it still brought something like $8500. The 6L6 amp was still attached!
Might be able to find something here -
History of Cinemag Inc. Los Angeles CA
guns kill people,
like spoons made rush limbaugh,
fat ....
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