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 Post subject: Western Electric 100F
PostPosted: Nov Thu 22, 2018 8:22 pm 
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Location: Radio Heaven, North Carolina, near Charlotte, 28106-3015
I posted this originally on the Vintage Audio Forum and got few views
and no responses so I thought I'd try it here.


I visited a ham buddy of mine a couple days ago to pickup some
450 ohm ladder line so I can rebuild my G5RV.
He happened to have a load of "stuff" he was planning to take
to a Carolina DX Association meeting to give away to help
cleaning out his basement and some other stuff for a silent key's
estate. One of the items I brought home was this Western Electric
100F audio amplifier.
The pix below shows it with all the dust still on it, I'll give it
"The Treatment" in a few days.
I google it and found lots of general info on it, but nothing that
could exactly what it was intended to be used with.
Hopefully someone here will know.
I've included some close up photos showing the two labels that
are on it.

Thanks a bunch.


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 Post subject: Re: Western Electric 100F
PostPosted: Nov Thu 22, 2018 9:31 pm 
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Joined: Nov Tue 14, 2017 5:09 am
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Location: Austin, Texas
Since it has a 600 ohm line input, it was probably intended to attach to a telephone system. Maybe to allow someone on the phone (the "distant person") to speak to a room full of people.

Jay


Last edited by JnTX on Nov Thu 22, 2018 9:35 pm, edited 1 time in total.

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 Post subject: Re: Western Electric 100F
PostPosted: Nov Thu 22, 2018 9:34 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Beaver Falls, PA. USA
Ron, there was an article on one of those in the AWA Journal, a few years ago. As I remember, they were for intercom or paging systems.

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 Post subject: Re: Western Electric 100F
PostPosted: Nov Thu 22, 2018 9:45 pm 
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Location: Radio Heaven, North Carolina, near Charlotte, 28106-3015
Does anyone what vintage it is?
I've seen '30s and late '40s.

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 Post subject: Re: Western Electric 100F
PostPosted: Nov Thu 22, 2018 11:11 pm 
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Joined: Apr Tue 07, 2015 8:31 pm
Posts: 399
Location: Blue Lake, MA
Greetings Ron,

According to RadioMuseum, circa 1945:
https://www.radiomuseum.org/r/western_e ... eaker.html


Closed sales on eBay:
https://www.ebay.com/sch/i.html?_from=R ... =1&_sop=16


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 Post subject: Re: Western Electric 100F
PostPosted: Nov Thu 22, 2018 11:45 pm 
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Location: Austin, Texas
Radio Museum based their date on the 6SL7 that was registered in July of '41. Unless there was some war time application for these, they were probably built post WW2.

Jay


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 Post subject: Re: Western Electric 100F
PostPosted: Nov Fri 23, 2018 12:32 am 
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Too bad the family didn't check eBay before giving away this guys stuff, seems to happen a lot with Hams.


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 Post subject: Re: Western Electric 100F
PostPosted: Nov Fri 23, 2018 2:39 am 
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Location: Scotia, NY 12302
I've got one of them, had it for years. Never did know what it was used for and I don't
think Google was around when I got it. A previous owner painted mine gray.

Al

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 Post subject: Re: Western Electric 100F
PostPosted: Nov Fri 23, 2018 9:14 pm 
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Location: Sayreville, NJ 08872
Pulled from some web site:
"Was used by the railroads to listen to dispatcher's orders from over the telephone line"

Simply, a mono block roughly 11 watt amplifier with enclosed speaker. A WECo collector's item for some crazy reason (or maybe no sane reason at all) :D

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 Post subject: Re: Western Electric 100F
PostPosted: Nov Sat 24, 2018 2:04 pm 
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Location: Dublin, Ohio
I had one of these awhile back. Found it for $10 at a small antique shop. Restored it and found a real Western Electric collector who was thrilled to get it. As a former Bell Labs guy, I found it intriguing. As I recall, it was used as a telephone amplifier, used, as one person said, to put telephone conversations through a loudspeaker. This could be applicable to the hard of hearing, or to a business as was stated. Many uses. I believe it was a 40's device as noted. As I recall, the circuit design was very solid, as was most Bell System equipment. It was interesting as an engineer in the Bell System to build things that had to last for 40 years. And to write software for a switching system computer that had to be operational for all but 6 minutes per year on average.

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 Post subject: Re: Western Electric 100F
PostPosted: Nov Mon 26, 2018 5:44 am 
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Joined: Jan Mon 12, 2009 7:38 am
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Location: homestead, fl
Its a hot chassis. Be careful. Does have input isolation.


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 Post subject: Re: Western Electric 100F
PostPosted: Nov Mon 26, 2018 12:53 pm 
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Location: Dublin, Ohio
I did not fully recall the schematic so I downloaded it. See below.
Indeed it has a hot chassis but at least it has a DPDT switch for power that does not leave it hot when off. (I hate those AA% radios that power on by connecting the ground while leaving the rest of the radio hot.)
I commented that the design was solid. Well, now I should amend my recollection that the physical design was solid!
That circuit is funky for sure and minimal. Why the parallel triodes on the 6SL7??
The one thing I do recall is that the ballast gets really hot so watch that. This thing can be used as a space heater as well. ;-)
Why did they not use higher voltage heaters like the 50L6, a higher heater voltage rectifier like 50Y6, and even a 12SL7 to reduce the power in the ballast?

Image

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