[pure-silver] Re: Enlarger Lamp Life

I will not comment on whether your enlarger is running correctly or not,,,, but 
will comment on your measurements....

One of the ways of making a "regulator" for voltage is to depend on the load to 
drag down the voltage on the transformer.  IOW, without a load, the transformer 
output is higher than you would think.

Another method of regulation is  to current control the output, not he voltage 
to be a constant.

Have you tried to put a voltage spike protector on the input line to prevent 
the spikes from getting through to your bulb? 

Frank Filippone
red735i@xxxxxxxxxxxxx


-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx 
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Eugene Barrington
Sent: Monday, October 27, 2008 8:32 AM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Enlarger Lamp Life

Hello - I'm a new poster to this list but I've consulted it regularly.

I know that this topic has been dealt with before - but the enlarger  
lamp I need to  use is is rather expensive (€21,£16.96,$26.17 and so  
forth) and they have a nasty habit of blowing. My enlarger is a Meopta  
with a colour head which uses  a Philips Focusline fibre optic lamp  
type 6834 FO. I suspected a faulty transformer. using a multimeter I  
got a maximum, but steady 13.1 volts output from the transformer. The  
lamp is rated at 12volts 100w. Is it being overloaded at 13v? Could  
this be the reason for the frequent blowouts or is there some  
tolerance with the voltage?

Hope somone can help with this -
Eugene Barrington






























































































































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