[Vintage-Audio]V40#15- BIG Wire

Thu Nov 29 23:13:11 EST 2007

I'll admit to it. I had my own 4 block coverage on 690KHz 
and played 78 RPMs, mostly Big Band Jazz.

I was 12 or so at the time.

WBob

----- Original Message ----- 
From: "Duane Fischer, W8DBF" <dfischer at usol.com>
To: "Vintage home and professional audio equipment from 1975 
back" <vintage-audio at mailman.qth.net>
Sent: Thursday, November 29, 2007 5:20 PM
Subject: Re: [Vintage-Audio]V40#15- BIG Wire

> 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: 
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>>> List Administrator: Duane Fischer, W8DBF
>>> ** For Assistance: dfischer at usol.com **
>>
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>> ** For Assistance: dfischer at usol.com **
>>
>>
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>
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