[Vintage-Audio]V40#15- BIG Wire

[Duane Fischer, W8DBF]

Hey Michael,

Remember when most of us found some empty soup or vegetable cans in the 
trash can, rinsed them out, used a hammer and nail to punch a hole in the 
bottom, stuck a string through the hole, put a small washer on the end of 
the string and tied a knot to keep it from coming off ... Did the same on 
the other end of that non-conductive telephone wire and had our secret 
phones from one bunker bush to another? At least 'our' telephone company did 
not keep increasing the rates!

What was a little bit scary was when we really thought we did hear a faint 
far off voice answer us!

I wonder how many on this list would admit to building a 100 milliwatt 
transmitter and playing 45 rpm singles over the air as they had visions of 
being a DJ dancing in the canyons of their minds?



Duane Fischer, W8DBF/WPE8CXO
dfischer at usol.com
HHI: Halligan's Hallicrafters International
http://www.w9wze.net
HHRP: Historic Halligan Radio Project
hhrp.w9wze.net

----- Original Message ----- 
From: "michael salmons" <salmonsm at missouri.edu>
To: "Vintage home and professional audio equipment from 1975 back" 
<vintage-audio at mailman.qth.net>
Sent: Wednesday, November 28, 2007 7:34 PM
Subject: Re: [Vintage-Audio]V40#15- BIG Wire


>
> I've already let the cat out fo the bag regarding my slack attitude 
> toward wire... but I can say I have used coax for speaker wire before  and 
> found it to be perfectly satisfactory.
>
> Then again, I use LAMPCORD <roll eyes>...
>
> Just joshin.
>
> Michael
>
> On Nov 28, 2007, at 5:20 PM, Phil Barnes-Roberts WA6DZS wrote:
>
>> vintage-audio-request at mailman.qth.net opined  on 11/28/2007 01:03 AM:
>>> --------------------------------------------------------------------- 
>>> ---
>>> Subject: Re: [Vintage-Audio] Re Speaker Wire Options
>>> From: "wolfbob" <wolfbob at csnsys.com>
>>> Date: Tue, 27 Nov 2007 19:29:40 -0800
>>> To: "Vintage home and professional audio equipment from 1975 back" 
>>> <vintage-audio at mailman.qth.net>
>>> Duane.
>>> I said it before and will always say it. USE BIG WIRE. Think of  Ohms 
>>> Law a minute. If you are running 20 watts into what is  probably 4 ohms 
>>> (at 50-100 Hz into a big speaker. They are 8 ohms  or so at 1000Hz) you 
>>> will have about 9 volts across the speaker  and will be drawing about 
>>> 2.5 amps. Now if your speaker wire has  0.5 ohm of resistance you will 
>>> loose 1.25 volts or about 2 dB of  bass. You can easily hear this loss. 
>>> If you don't believe me run  your #24+ wire and in parallel run some #14 
>>> or #12 and do an A/B  test and play your bass singer. He will fade into 
>>> the background.  I have #14 speaker wire ala RS running to all my 
>>> speakers. Things  get much worse if you are punching those JBLs with 
>>> some real  peaks. They just won't be peaks anymore as the IR losses eat 
>>> away  your great audio.
>>> WBob
>> Hi, Guys (&Gals)--
>>
>> Not having run across #24 'Speed Wire' I'll have to pass on it;  sounds 
>> like phone-closet twisted-pair stuff, though, or doorbell  wire.  Light. 
>> Way light.
>>
>> You've reminded me of something K8EBR, Tom Pierce told me one day  in the 
>> EMC Lab at JPL, that agrees with Bob.
>>
>> If you really want 8-ohm-impedance pair wire, get some (surplus?) 
>> RG-11/U coax (stored indoors is best, so we'll hope it's  uncontaminated 
>> with the jacket plasticizers after years in the sun,  or on the shelf).
>>
>> Ignore the center conductor, and tie-wrap two pieces of this half- 
>> inch-or-so coax together along their length.  That size conductor, 
>> jacket and spacing is supposed to come out to eight ohms.  Twisting 
>> together (obviously, not very tight) helps cancel out fields over  the 
>> length of the run - with any pair.
>>
>> You'd probably have to skin back jackets and braids, remove some  center 
>> conductor and inner poly insulation, and twist the two  stranded braids 
>> into a pair for your connections.  A monster  indeed!  Anybody hear this 
>> one before?
>>
>> -- 
>> '---O=o=O---'
>> 73, Phil Barnes-Roberts WA6DZS < Mailto:pbarnrob at acm dot org >
>> "When you are trying to get a handle on a big decision, try looking
>> at it like this; 'What kind of world do I want to live in?'"
>>  --Ann Bodenhamer Martin, author of /Calico/ /Families/
>> _______________________________________________
>> Home: http://mailman.qth.net/mailman/listinfo/vintage-audio
>> List Administrator: Duane Fischer, W8DBF
>> ** For Assistance: dfischer at usol.com **
>
> _______________________________________________
> Home: http://mailman.qth.net/mailman/listinfo/vintage-audio
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> -- 
> No virus found in this incoming message.
> Checked by AVG Free Edition. Version: 7.5.503 / Virus Database: 
> 269.16.9/1155 - Release Date: 11/27/2007 8:30 PM
>