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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#761
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Posted to sci.electronics.repair,uk.rec.audio,uk.tech.broadcast
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In message , Michael A.
Terrell writes: "J. P. Gilliver (John)" wrote: [Muntz TVs] Was it purely that they were deaf? If so, would they have been one of the few cases where an external preamp (in the room, not masthead) was actually useful (or were the noise figures of external preamps pretty bad then)? If they could have afforded a decent TV amp in the '50s or '60s, they could have bought a better tv for less than the amp & the Muntz TV. But if they'd already got the Muntz TV? -- J. P. Gilliver. UMRA: 1960/1985 MB++G.5AL-IS-P--Ch++(p)[email protected]+Sh0!:`)DNAf Intelligence isn't complete without the full picture and the full picture is all about doubt. Otherwise, you go the way of George Bush. - baroness Eliza Manningham-Buller (former head of MI5), Radio Times 3-9 September 2011. |
#762
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Posted to sci.electronics.repair,uk.rec.audio,uk.tech.broadcast
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In message , Geoffrey S.
Mendelson writes: [] So while it would of been likely that the US did not enter the war in 1941 if there was no attack on Pearl Harbor, eventually Roosevelt would have found a way, or an attack would of happened. As for the war not happening at all, if the King of England, who was a fascist supporter had not been forced to abdicate, when Germany invaded the Studentenland, he would not of declared war on Germany. I love "Studentenland" (-:! ["It's those damn students making trouble again!"] If Germany had kept its nonagression pact with the Soviet Union, and been satisifed with Europe, there may not have been a "world" war. Not likely, but a long train of "ifs" that were possible. [] Accompanied by several "would of"s - but, puzzlingly, not entirely: there are at least two "would have"s as well. -- J. P. Gilliver. UMRA: 1960/1985 MB++G.5AL-IS-P--Ch++(p)[email protected]+Sh0!:`)DNAf Sarcasm: Barbed ire |
#763
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Posted to sci.electronics.repair,uk.rec.audio,uk.tech.broadcast
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![]() "J. P. Gilliver (John)" wrote: But if they'd already got the Muntz TV? Then P.T. Barnum was right. -- You can't have a sense of humor, if you have no sense. |
#764
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Posted to uk.tech.broadcast,uk.tech.digital-tv,rec.audio.tech,uk.rec.audio,sci.electronics.repair
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On Sat, 28 Jan 2012 00:28:20 -0000, Dave Plowman (News)
wrote: In article , wrote: n Britain one may readily obtain a "site transformer" which will give what is advertised as 110 volt balanced power. I haven't been there in 20+ years, can any Brits tell me if that's really true or if 120, or more, or less, is actually common? They are used for electric drills and whatnot outdoors. Vintage US gear works fine at 110, but mostly not current stuff. 110 volt via an isolating transformer is used on building sites etc for all power tools. Purely for safety reasons. Just for completeness ( I know I'm very late to this party but it's an important point), Those 110v transformers produce a bi-phase supply of 55-0-55 Vac. The two lives provide the 110v but the shock hazard wrt grounding is reduced to a mere 55v which is merely very unpleasant in the wet if the user happens to provide a path to earth. -- Regards JB Good |
#765
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#766
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Posted to uk.tech.broadcast,uk.tech.digital-tv,rec.audio.tech,uk.rec.audio,sci.electronics.repair
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"Johny B Good" writes:
On Sat, 28 Jan 2012 00:28:20 -0000, Dave Plowman (News) wrote: In article , wrote: n Britain one may readily obtain a "site transformer" which will give what is advertised as 110 volt balanced power. I haven't been there in 20+ years, can any Brits tell me if that's really true or if 120, or more, or less, is actually common? They are used for electric drills and whatnot outdoors. Vintage US gear works fine at 110, but mostly not current stuff. 110 volt via an isolating transformer is used on building sites etc for all power tools. Purely for safety reasons. Just for completeness ( I know I'm very late to this party but it's an important point), Those 110v transformers produce a bi-phase supply of 55-0-55 Vac. The two lives provide the 110v but the shock hazard wrt grounding is reduced to a mere 55v which is merely very unpleasant in the wet if the user happens to provide a path to earth. Wrong. It's about current. Here's an excerpt from OSHA: Below 1 milliampere Generally not perceptible 1 milliampere Faint tingle 5 milliamperes Slight shock felt; not painful but disturbing. Average individual can let go. Strong involuntary reactions can lead to other injuries. 625 milliamperes (women) Painful shock, loss of muscular control* 930 milliamperes (men) The freezing current or let-go range.* Individual cannot let go, but can be thrown away from the circuit if extensor muscles are stimulated. 50150 milliamperes Extreme pain, respiratory arrest, severe muscular contractions. Death is possible. 1,0004,300 milliamperes Rhythmic pumping action of the heart ceases. Muscular contraction and nerve damage occur; death likely. 10,000 milliamperes Cardiac arrest, severe burns; death probable -- Randy Yates DSP/Firmware Engineer 919-577-9882 (H) 919-720-2916 (C) |
#767
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Posted to uk.tech.broadcast,uk.tech.digital-tv,rec.audio.tech,uk.rec.audio,sci.electronics.repair
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Sorry, a lot of that paste below was gibberish. Here's
the link: osha.gov/Publications/osha3075.pdf --Randy Randy Yates writes: "Johny B Good" writes: On Sat, 28 Jan 2012 00:28:20 -0000, Dave Plowman (News) wrote: In article , wrote: n Britain one may readily obtain a "site transformer" which will give what is advertised as 110 volt balanced power. I haven't been there in 20+ years, can any Brits tell me if that's really true or if 120, or more, or less, is actually common? They are used for electric drills and whatnot outdoors. Vintage US gear works fine at 110, but mostly not current stuff. 110 volt via an isolating transformer is used on building sites etc for all power tools. Purely for safety reasons. Just for completeness ( I know I'm very late to this party but it's an important point), Those 110v transformers produce a bi-phase supply of 55-0-55 Vac. The two lives provide the 110v but the shock hazard wrt grounding is reduced to a mere 55v which is merely very unpleasant in the wet if the user happens to provide a path to earth. Wrong. It's about current. Here's an excerpt from OSHA: Below 1 milliampere Generally not perceptible 1 milliampere Faint tingle 5 milliamperes Slight shock felt; not painful but disturbing. Average individual can let go. Strong involuntary reactions can lead to other injuries. 625 milliamperes (women) Painful shock, loss of muscular control* 930 milliamperes (men) The freezing current or let-go range.* Individual cannot let go, but can be thrown away from the circuit if extensor muscles are stimulated. 50150 milliamperes Extreme pain, respiratory arrest, severe muscular contractions. Death is possible. 1,0004,300 milliamperes Rhythmic pumping action of the heart ceases. Muscular contraction and nerve damage occur; death likely. 10,000 milliamperes Cardiac arrest, severe burns; death probable -- Randy Yates DSP/Firmware Engineer 919-577-9882 (H) 919-720-2916 (C) |
#768
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Posted to uk.tech.broadcast,uk.tech.digital-tv,rec.audio.tech,uk.rec.audio,sci.electronics.repair
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The larger numbers look very wrong. You don't need anywhere nearly that much
current to kill someone. 1,0004,300 mA? Not only is it overly precise, but 1000A will cook someone, not just kill them. |
#769
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Posted to uk.tech.broadcast,uk.tech.digital-tv,rec.audio.tech,uk.rec.audio,sci.electronics.repair
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On Apr 7, 3:27*am, "William Sommerwerck"
wrote: The larger numbers look very wrong. You don't need anywhere nearly that much current to kill someone. 1,0004,300 mA? Not only is it overly precise, but 1000A will cook someone, not just kill them. good eye that should have read 1000-4300 milliamperes go to the URL http://www.osha.gov/Publications/osha3075.pdf |
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