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careerEE
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It's still in the basement...
careerEE   10/1/2013 5:21:52 PM
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Being the only EE in my extended family, I inherited my grandparent's broken console-model wire recorder.  In a burst of energy in my 30's, I pulled the electronics out, replaced a broken tube or two, then got it working.  Because the motor bearings and transmission were worn out, it ran under-speed, and all the voices were low and slow.  Powering it from a variac transformer, dialed up above 110Vac, I was able to 'tune' the speed, so that Grampa's voice sounded right.  But it took about 5 muffin fans aimed at the electronics and motor, to keep it from thermal meltdown.

I discovered recordings of my Grampa's barbershop group singing on the radio, and also found a recording of my dad teaching my youngest uncle to talk.

Dubbed over to cassette tape, those copies made great Christmas gifts for the extended family that year.

alzie
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Re: Wire Recorder
alzie   9/20/2013 3:22:52 PM
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Right Max,
I still dont know what i want to be when i grow up!
 
 
Re: Wire Recorder 
Max The Magnificent   9/20/2013 2:59:23 PM
 
 
"But I refuse to get any older -- I'm going to hold at my current age for the next 100 years or so -- good grief, I'm only just starting my third chaildhood!"
 


Max The Magnificent
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Re: Wire Recorder
Max The Magnificent   9/20/2013 2:59:23 PM
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@alzie: I started out with tape recording half a century ago...

Doesn't it feel strange saying stuff like that? It's like when I'm talking about my friend Brian Bailey and I say: "I attended a class Brian gave on SCAN technology around 30 years ago and I still have the notes."

But I refuse to get any older -- I'm going to hold at my current age for the next 100 years or so -- good grief, I'm only just starting my third chaildhood!

rich.pell
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Re: Wire Recorder
rich.pell   9/20/2013 2:55:12 PM
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Agreed, well-encoded MP3s are a big step up from cassette tape (like well-recorded CDs were over vinyl)!  However the bulk of my music library is stored as FLAC files.

alzie
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Wire Recorder
alzie   9/20/2013 2:21:48 PM
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Yeah, not bad!

Now, how do we get stereo on that wire?!

 

I started out with tape recording half a century ago,

learned a whole lot.

A good place for budding engineers.

 

Although i begrudgingly use MP3 do to my distaste for compression,

at least we have gotten rid of distortion, noise, and wow n flutter.

Beats the crap out of those old cassettes!

They were compact and convenient, but

ive got most of my music collection on one 16GB player.

The plusses out weigh the minusses.

 

JGrubbs
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Re: I so want one of these!!!
JGrubbs   9/17/2013 2:03:23 PM
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Here is a link where you can download the book

Magnetic Recording Wire & Tape

http://www.tubebooks.org/Books/TapeWire.pdf

www.tubebooks.org has a lot of 1930 - 1960

technical books and data books available for

free download.

Max The Magnificent
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Re: I so want one of these!!!
Max The Magnificent   9/6/2013 2:34:16 PM
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@wbeaty: No mention of where these things came from?

Actually, I mentioned this in an earlier column in which I wrote:

The first magnetic wire recorder was created in 1899 by a Danish Engineer called Valdemar Poulsen (1869 – 1942). Commercial magnetic wire recorders for dictation and telephone recording were made almost continuously from the 1920s onwards, but the real heyday of wire recording was in the 1940s through to the mid-1950s.

wbeaty
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Re: I so want one of these!!!
wbeaty   9/6/2013 2:26:18 PM
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No mention of where these things came from?  The first I've seen wasn't a recorder, it was a radio detector: a loop of moving wire with two coils touching, antenna on the first coil and headphones on the second, and a magnet to restore the wire afterwards.  "Marconi Magnetic Detector."   Nonlinear effects presumably demodulated the RF.    I guess it was a Coherer with a single giant iron filing.

Hmm.  Was this the origin, or did wire recorders predate 1910 or so?  Firesign Theater of course insists that they were invented by native americans who recorded civil-war era theater dramas...

Max The Magnificent
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Re: try a switching amplifier to drive the record head
Max The Magnificent   8/7/2013 10:46:33 AM
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@Electrojim: ...The tradeoff is 'modulation noise,' which can be eliminated by applying a sort of 'dithering,' which puts the biased-tape noise right back.

You are making my brain hurt :-)

 

Max The Magnificent
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Re: The isle is full of noises
Max The Magnificent   8/7/2013 10:45:09 AM
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@Susan: At least she will be driving on the other side of the road. ;-)


You sweet, innocent child ... you've obviously never seen my mother drive :-)

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