Digest for sci.electronics.repair@googlegroups.com - 11 updates in 5 topics

thekmanrocks@gmail.com: Jan 13 12:23PM -0800

Tim R:
 
Since there are speaker selectors then the speakers, in theory,
should not be canceled by plugging in headphones. On my 1990s
era JVC receiver, I have to remember to deselect all speakers
when listening via headphones, or I'll still be sharing what I'm
listening to with the wife - or the neighbors...! And speakers on
buss A, B, or both can still be driven with it while listening to
headphones, so I have to remember to select them out.
 
Sounds like yours has got some serious main board(motherboard to
us PC geeks) issues, or soldering issues.
Tim R <timothy42b@aol.com>: Jan 13 07:00PM -0800

> headphones, so I have to remember to select them out.
 
> Sounds like yours has got some serious main board(motherboard to
> us PC geeks) issues, or soldering issues.
 
Well, I dunno about that.
Most equipment I've had if the headphone jack was 1/8, it would disconnect speakers, and if 1/4, not.
But looking at this CA-400, I can only select A or B speakers. I can't choose none. So it makes sense that the headphone would disconnect them. Maybe it's working properly.
thekmanrocks@gmail.com: Jan 13 07:53PM -0800

Tim R:
 
My old 1980s Sears one-piece Tuner/Phono/Cassette
had 1/4" headphone out, and it cancelled the speakers
when I plugged cans into it, just as the 1/8" on my
later bookshelf CD/Tuner/Aux.
 
That Fisher though sounds like one of a kind!
Chuck <ch@dejanews.net>: Jan 14 10:36AM -0600

On Sun, 13 Jan 2019 19:00:48 -0800 (PST), Tim R <timothy42b@aol.com>
wrote:
 
 
>Well, I dunno about that.
>Most equipment I've had if the headphone jack was 1/8, it would disconnect speakers, and if 1/4, not.
>But looking at this CA-400, I can only select A or B speakers. I can't choose none. So it makes sense that the headphone would disconnect them. Maybe it's working properly.
It is. A very common configuration.
bruce2bowser@gmail.com: Jan 14 07:02AM -0800

On Thu, 10 Jan 2019 08:07:13 -0000 (UTC), gregz <ze...@comcast.net>
wrote:
 
>supposed to have oil to prevent skin drying too much. Most don't. Isopropyl
>or ethyl cleans heads.
>Greg
 
Suffice it to say that using a substance for a purpose not mentioned on the container's label just isn't what you want. Go to a trusted computer or parts retailer and specifically ask for 'parts cleaner', 'head cleaner' .. etc. Because it beats re-inventing the wheel, being adventuresome, gambling, etc...
"pfjw@aol.com" <peterwieck33@gmail.com>: Jan 14 07:43AM -0800


> Suffice it to say that using a substance for a purpose not mentioned on the container's label just isn't what you want. Go to a trusted computer or parts retailer and specifically ask for 'parts cleaner', 'head cleaner' .. etc. Because it beats re-inventing the wheel, being adventuresome, gambling, etc...
 
There is always that.
 
But: Windex (a trusted name-brand cleaner) is:
 
Ammonia
Isopropyl Alcohol
Blue Dye
Water
 
Not very much of the first three, either.
 
Most of those here are at least somewhat sophisticated in the use of search engines. Some of us even fix things on occasion. Point being that with a small amount of research and time, we may be capable of formulating perfectly adequate cleaning solutions that are also both safe and effective. Typically, when we do this successfully, the results are fine, the costs low, and environmental impacts minimized. All good. The only significant caution(s) would be to be absolutely sure we understand the ingredients involved.
 
Peter Wieck
Melrose Park, PA
tabbypurr@gmail.com: Jan 14 08:03AM -0800

> On Thu, 10 Jan 2019 08:07:13 -0000 (UTC), gregz <ze...@comcast.net>
> wrote:
 
> Suffice it to say that using a substance for a purpose not mentioned on the container's label just isn't what you want. Go to a trusted computer or parts retailer and specifically ask for 'parts cleaner', 'head cleaner' .. etc. Because it beats re-inventing the wheel, being adventuresome, gambling, etc...
 
You won't do very well in life with that attitude.
 
 
NT
thekmanrocks@gmail.com: Jan 13 07:56PM -0800

tub...@myshop.com
 
1980s, AM extended up to 1700
Allodoxaphobia <knock_yourself_out@example.net>: Jan 14 02:41PM

> tub...@myshop.com
 
> 1980s, AM extended up to 1700
 
In the western hemisphere...
 
"On June 8, 1988 a conference held at Rio de Janeiro under the auspices
of the International Telecommunication Union adopted provisions,
effective July 1, 1990, for the countries located in the Americas to
add ten AM band transmitting frequencies, from 1610 to 1700 kHz."
 
https://en.wikipedia.org/wiki/Radio_in_the_United_States
eventcompanyphuket@gmail.com: Jan 14 04:25AM -0800

Hello everyone
tabbypurr@gmail.com: Jan 13 06:00PM -0800

I've done the 1940s ones, fairly straightforward. Roller brush bearing cleanout & oil, thorought electrical safety checks & cleanup, wash bag, new belt on one, pad a stripped screw socket thread with a bit of card, new plugs - think that's about it.
 
I've not started on the '36 yet, so am looking for any preliminary comments. The motor runs but is stiff, so will open that up. It has the original 1930s bag which I absolutely do not want to see damaged - but it's filthy and I assume well clogged. IME cloth bags on old hoovers always need thorough washing, question is how I can do that without degrading the applied lettering or bobbling the cloth? Handwashing in lukewarm water has some tendency to cause such damage.
 
There's also a much later junior with a seized motor. Other than that it works great ;)
 
 
NT
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