[pure-silver] Re: Enlarger Lamp Life

Here, in Ireland, and, I suppose the rest of W. Europe the voltage is 220v.
Would'nt the transfomer's o/p still be 12v even if the input varied a bit? BTW Ole what brand of lamp do you use? I've been using Philips Focusline 6834 FO. 

Eugene Barrington

On 29 Oct 2008, at 17:08, Richard Knoppow wrote:



----- Original Message ----- From: "Ole Tjugen" <ole@xxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, October 29, 2008 7:41 AM
Subject: [pure-silver] Re: Enlarger Lamp Life
That's strange, as I haven't had a lamp blow in my Meopta enlarger with colour head - ever. And I do just the same with a metronome and the power switch.
The transformer on mine delivers about 13V too, many colour head lamps are deliberately overvolted.
Also: The voltage supplied by the electricity companies hasn't increased over the years. But as lines are replaced, transformers upgraded et cetera, the assumed voltage delivered to the customer has increased through a reduction in transmission losses. 

Ole Tjugen
Certainly not in Los Angeles and other places in the US. Standard voltage here was 115 and occasionally 117 volts for many years, these are the rated voltages on equipment of many sorts. Now, measured line voltage is closer to 120 to 125 volts, enough higher to cause problems with some older electronic equipment. Lines and distribution transformers get replaced routinely so the overall "age" of the syetem tends to be constant except for new developments. I am in a very old part of LA with old distribution equipment and still have high line voltage. OTOH, line voltage varies during the day and varies with general demand. Power in the City of Los Angeles comes from the municipally owned Depart of Water and Power but outlying areas get power from the Sothern California Edison Co. I don't know, but can find out SCE practice vis line voltages. There are also some independant municiply owned power suppliers here such as the Burbank and Pasadena departments. 

--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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