[pure-silver] Re: Beseler/cold light enlarger questions
- From: "Bob Younger" <younger@xxxxxxxxxxxxxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 2 Sep 2005 19:03:49 -0700
With the cold light head you should bypass the Resitrol
completely. The heater cord should be plugged into a
non-switched outlet; and you should allow the lamps to warm
up. That should help your flickering problem. I never had
any problem with mine using a regular timer.
With the condenser lamp the Resistrol was designed to enable
you to consistently set a voltage for repeatability. So, you
can set it a voltage you know you can always rely on having,
say, 105 or 110 volts.
Bob Younger
younger@xxxxxxxxxxxxxxxxxxxxxxxx
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of john
stockdale
Sent: Saturday, September 03, 2005 8:39 AM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Beseler/cold light enlarger
questions
Leaving aside for a moment your timers and the Resistrol
(about which I
know nothing but guess is a dimmer),
the condenser head simply has an incandescent globe (with a
filament) so it
just gets plugged into power. Any photographic timer should
be ok.
the cold light head has two inputs: one is a heating element
that goes part
of the way to stabilizing the output from the head by
keeping the unit warm
between exposures. (The light output varies with
temperature). The other
cable is the lamp. Which is which? Plug one cable into the
power. If the
lamp turns on, that's the lamp cable. If it doesn't, it's
the heater cable.
The condenser head should be fine with any timer. The cold
light heads, as
I understand it, impose a difficult load on some devices,
and you might
need a relay (contacter in USA?) to isolate the load from
the timer. If
the cold light head appears to work well plugged into the
power directly,
but flickers on the timer, then it's definitely not a good
combination
without the relay/contacter. The heater element is
connected to the power
for the whole session. Some people connect it so that it's
off during
exposures (using the safelight output of the timer) so that
heat buildup is
lessened during exposure, but I don't know if it makes much
difference.
Can't help you with the Resistrol. Maybe you don't need it.
The aristo web site might have some info.
http://www.aristogrid.com/
Hope this helps
==================================
At 12:39 PM 2/09/2005, you wrote:
>Hi,
>
>I just bought a Beseler MCRX enlarger w/ both an
>Aristo V54 cold light head and a condenser head. I've
>never used either a cold light or a Beseler enlarger
>before, and no manuals were included. I'm wondering if
>I've set up everything correctly. I'm hoping someone
>on the list uses a Beseler 4x5 enlarger or cold light
>head who might be able to help me out?
>
>My questions:
>
>1. I set it up w/ the Gralab 450 digital timer that
>came w/ it, and it seems to work alright, but the
>light from the cold light head flickers a bit, rather
>than being a stong constant light. Is that standard
>for cold light head?
>
>2. When I use my Beseler Audible Repeating timer w/
>the cold light, times up through 8 seconds seem
>accurate compared to my watch, but longer times are
>slightly short by half a second or slightly more. In
>addition, the metronome beeps on this timer are now
>slower than 1 second. For example, if I set 14
>seconds, the light will be on for 13.5 seconds or so,
>but I only get 10 beeps. At 5 seconds, I get 4 beeps.
>This problem w/ the metronome does not happen w/ the
>Gralab timer, and it does not happen w/ either timer
>when using the condenser head. Can one only use
>certain timers w/ a cold light head?
>
>I really like the Beseler timer, and would prefer to
>use that one, but am afraid I might burn it out.
>
>3. Am I setting up everything correctly?
>
>The cold light head has 2 power cords coming out of
>the light. One goes to the timer, the other goes into
>the plug on the side of the Resistrol. The timer is
>plugged into the outlet labelled "switch" on the front
>of the motor, and the power cord from the motor goes
>to the wall outlet.
>
>The condenser head has only one power cord, so must be
>set up differently. The way I figured out for that is
>to plug the lamphouse into the Resistrol, plug the
>motor power cord into the timer, and the timer into
>the wall. Into the "switch" outlet on the motor, I
>plug in a very short cord that ends with a toggle
>on/off switch. (with this set-up I can only use the
>motor when the timer is set to focus.
>
>4. What's the purpose of the Resistrol adjustment, and
>when should I change it? (With the condenser head,
>the needle registers a little over 90 volts. With the
>cold light, it only moves slightly up to around 50.
>
>Thanks.
>
>John Meyers
>
>
>
>
>
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