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:
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?
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.
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