Digest for sci.electronics.repair@googlegroups.com - 7 updates in 4 topics

crankypuss <undisclosedUserid@gmail.com>: Aug 12 09:08AM -0600

On 08/11/2016 02:24 PM, The Real Bev wrote:
> on the theory that either I'll want them instantaneously ("Find my car"
> or I use them so often (ES File Explorer) that I don't want to waste
> extra taps or brain-pixels.
 
I just put my most-frequently-used apps in the easiest-to-get-to place,
and when something gets used often enough to make accessing it an
annoyance, I promote it to an easier-to-access position. Duh?
 
--
http://totally-portable-software.blogspot.com
[Sat Mar 26: "Documentation and Portability"]
crankypuss <undisclosedUserid@gmail.com>: Aug 12 09:39AM -0600

On 08/11/2016 01:05 PM, Aardvarks wrote:
> Q: Without logging into anything, and without any google accounts, how is
> running a non-Google app offline going to tell Google anything?
 
If you don't want google able to peek into your life, you also need to
not use google search, and not visit any websites that use google ad
services, and not do a whole bunch of other stuff, which you largely
can't avoid because when you visit some arbitrary website with a link to
some other arbitrary website, there's no telling in advance what
services any of them are using.
 
nospam's comment about not using google operating systems is mostly
spot-on, except that just about every maker (possible exceptions that I
know of being Moto and OnePlus) slams their own crapware into/onto
Android before it goes on your phone, and some might remove stuff Google
put there, but the bottom line is this: your OS is a crapshoot, unless
you personally review every line of code in the thing, you're trusting
someone, and the manufacturer (who orders the hardware from China)
doesn't give you the full source code for exactly whatever might be
installed on your phone by the time you gain possession of it.
 
You're in search of perfection. It's mostly been legislated out of the
realm of possibility due to cutthroat economic competition and a
consumer demographic that reads "mostly housewives and their hubbies or
their kids", ie "*not* computing professionals". If you really value
perfection, you'll find some way to facilitate it other than pissing off
potential friends by continually ranting about things that are totally
messed up; I know this from having been there. Put a cap over your rant
buttons, justified as they may be; remain in the part of the real world
that other people give a shit about, which clearly is not perfection:
Nobby Nobbs wouldn't know perfection if it bit him on the ass, and
probably half the readership here never heard of Nobby to begin with.
 
Paranoia is a good thing in a system security architect, but as a
consumer you're just pissing in the wind. So if you want perfection,
make your own. If you want to avoid people snooping into your real
life, don't ever enter a true fact about your life into any computer
anywhere. Good luck with that, it's about as useful as turning off
javascript (which imo is a low form of primordial excreta).
 
This is Earth, the world is fucked-up here, get used to it.
 
--
http://totally-portable-software.blogspot.com
[Sat Mar 26: "Documentation and Portability"]
N_Cook <diverse@tcp.co.uk>: Aug 12 12:28PM +0100

Tried on 115V selector setting at about 20% (UK) mains and current draw
went up to about what it was with 50% of UK mains on 245V setting.
IR thermo showed the Tx was warming up nicely even at 20% of 240V main,
current too low on variac ammeter to measure but .2 to .4 A ac.
I wonder how hot this Tx got , presumably in hours of use, stinking the
place out with tar smell (noticeable at just 10 deg C over ambient),
before it was stored away?
 
Anyway trying a bit of the tar on DVM-R, squashing the probes together
over a bit of it, perhaps about 0.2mm thick, could get a few megohm.
Trying on a megger over a 1mm or 2, easily got 500M to 1G. So has anyone
ever tried removing one of these Tx and baking in a low oven , outdoors
presumably, to drain liquid tar out, then replace it with what ?.
I'll disconnect all the wires and see if there is a pair of points I can
measure with a Megger, if any of the team think its worth trying in an
oven or other ideas?
Conductive resistor path inside would explain the linear characteristic
of the excess current , but primary , secondary? With Tx removed I can
check inter winding leakage and to frame,screen etc
With Tx removed, would it be worth removing the outer cooked paper and
underlying cloth to get a closer look at the windings, perhaps tar is
just leeched from the cloth originally (for anti-damp purposes and not
holding windings in place? Where to research Tx construction of the 1960s?
The owner said that while it was working properly last week and the
start of the arcing/sparking noise , before switching off,there was a
puff of what he called steam rather than smoke, before switching off.
Perhaps related to damp or fried insect and nothing to do with the tar
resistor problem. I've not had anywhere near full HT on this amp.
 
Valve rectifier, not SS, BTW
N_Cook <diverse@tcp.co.uk>: Aug 12 02:30PM +0100

If paper burns at 451 deg F, what temp for near to charring, the voltage
& current ratings are just about readable with the right light on the
Tx, as black print on now almost black grade of brown paper, colour
maybe partly due to tar vapour of course
"pfjw@aol.com" <pfjw@aol.com>: Aug 12 08:46AM -0700

On Friday, August 12, 2016 at 9:30:10 AM UTC-4, N_Cook wrote:
> & current ratings are just about readable with the right light on the
> Tx, as black print on now almost black grade of brown paper, colour
> maybe partly due to tar vapour of course
 
http://www.keypolymer.com/potting-encapsulating/ is a source for new potting compounds.
 
451F is the *FLASHPOINT* (on average) of paper. NOT the burning temperature which can be much higher or lower depending on external conditions. What this means is that a piece of paper will catch fire in the presence of sufficient oxygen at 451F. Char temperatures are much lower, starting as low as 200F depending on the type of paper and external factors.
 
For instance, wood, from which paper is made, burns from between 900F and 1,200F, and can be much higher if oxygen is forced into the fire. Paper is mostly cellulose without the volatiles, so burns at a lower temperature, again unless oxygen is added.
 
Peter Wieck
Melrose Park, PA
"J.B. Wood" <arl_123234@hotmail.com>: Aug 12 07:04AM -0400

On 08/11/2016 10:53 PM, Ron D. wrote:
 
> phone connected but off hook. I forget the magic mumbers your
> looking for. I think it's a few megohms max.
 
> If overhead lines, then spiders in the box there too.
 
Hello, and no DSL. The rest of your points make technical sense. My
ca. early 1940s apartment building has a large grey wall-mounted W-E/Ma
Bell box in the laundry room with a punch-down terminal strip. The
house wiring from these terminals to units isn't the traditional
sheathed red-green-yellow-black but simply twisted pair (IOW just tip
and ring) like that used to connect to the outside plant. The
connections from the wall-mounted terminals in my unit and the
corresponding incoming phone line wires appear to be firmly punched-down
in the W-E terminal strip.
 
So, except for access to the laundry room terminal block and the
terminals in my unit there's really nothing else I can check either on
the outside of the building or elsewhere (which should be Verizon's
responsibility). Sincerely,
 
--
J. B. Wood e-mail: arl_123234@hotmail.com
"Snuffy \"Hub Cap\" McKinney" <Snuffy-Hub-Cap@Livebait-McKinney.com>: Aug 11 10:31AM -0700

Fellow tinkerers....this one is supposed to have twice as many as normal.
The story is that the best time is after midnight, after the moon goes down. Best way is to lie flat on a lawn chair with a nice tall drink in one hand, face the northeast and look about 2/3 of the way up and try not to fall asleep.
 
http://www.npr.org/sections/thetwo-way/2016/08/10/489491194/this-years-perseid-meteor-shower-is-going-to-be-quite-a-show-heres-how-to-watch
 
Or watch the live stream....
http://www.ustream.tv/channel/nasa-msfc
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