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#16
10-23-2009, 12:10 PM
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I have a couple of bakelite sets made like this. Luckily, I have a couple of isolation transformers that I can use when I work on these(and I know how to handle them).
Also, some TVs, such as the Philco "Seventeener" have hot chassis. These are internal and isolated from the external metal case if assembled correctly. However, always check this. I also use the isolation transformers on the TVs that I work on. 
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#18
10-23-2009, 03:53 PM
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I agree with Andy, as long as the isolation is present things are OK. I also mostly agree about things manufactured from the 1950s onward. However, I do have some 1953 or so 17 inch Hoffman Televisions with hot chassis. What they did to isolate the user from the chassis is not what I would call adequate. The tuner has a fiber shaft insert and the volume/contrast control is isolated. However, the controls on the back of the set are not. In addition, what they did on the front of the chassis(behind the door hiding the vertical hold, etc controls is place a large paper sheet. If this sheet gets a hole in it, the hot chassis is exposed for an errant finger, etc. Other items from this era were much better isolated according to what I have seen.
The last time I got a shock from anything that I worked on was not from the AC line, but from the cap of a horizontal output tube of an operating color set I was working on. This voltage will arc!
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#19
10-24-2009, 10:43 PM
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An oft-repeated story from the fifties should be repeated again: seems a young girl lost her life because a repairman had replaced a chassis mount screw with the wrong size. The longer screw contacted something it shouldn't have and put lethal voltage on the cabinet. Be careful out there!
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Bryan
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#20
10-28-2009, 06:13 PM
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While remodeling my basement some years ago, I pulled off a piece of paneling and loosened a wired receptacle box. The box swung over and touched a copper water pipe and it was the Fourth of July! The clown that had wired it had it backwards and the box was hot. You know, black is like the earth, so must be ground, and white is white hot, so must be hot.....
Reece
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Reece Perfection is hard to reach with a screwdriver.
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