Nick: I always go by the temperatures of the chemicals when processing, of course. However, for my test, that wasn't necessary. All that is important is that the temperarture in the reservoir and tempering bath remain contant. It was almost perfectly stable for three hours. In fact, I couldn't see any change at all on my Kodak Process thermometer. It stayed virtually spot-on. That's all a temperature control system can do. When actually processing film, I can simply adjust the temperature with the "fine" control on the heater/recyler to fine tune it. It's exacty the same as the Jobo temperature control except that it is MUCH more stable and it also heats up much more quickly and has much greater water flow to mix the water up better for even temperatures throughout the reservoir and water bath. BTW, the Jobo pump remains on to bring tempered water to the tempering bath but the Jobo heater is turned off. Before doing the test, I tested the Jobo heater in exactly the same way for the same amount of time. Temperatures varied by + or - 1.5 degrees and they were uneven in different areas of the main reservoir. That's no good. Again, stability is the important thing. Temperature can be adjusted easily. I used 38 degrees C for my tests. I use waterbaths in all kinds of ways including line sinks and, with proper jacketing - like the Jobo has - the chemicals will match the bath temperture almost always. But, again, if for some weird reason they didn't, I would just adjust it.
If you have a hot water temperature recyling unit, you don't have to make any change to your Jobo processor at all if you don't mind putting one of the hoses in the far-right bottle slot as I did in my tests. But I'm going to add another drain valve to the back/right of the processor for a neat hook-up. The processor will work as it was designed if desired with nothing to change at all. I filled the processor with water slightly below 38C and my heater brought it up all but insantly. As a further check, I filled the reservoir with water around 68-70 degrees and it only took the heater about five to ten minutes to get the temperature to a stable 38C. Compare that to the Jobo's heater!
The suppliers are:
That's "Joboman." I contacted him about something else last week and he's a great guy.
The second contact is:
Here is the page where he lists his Jobo parts. Oddly, it isn't linked to the rest of the website as far as I can tell.
I have emailed both of these people about 1/2 hour ago to ask about the parts I need so I haven't heard back from them yet. But Joboman told me that he has a wide selection of parts and he still services Jobo processors, even very old ones. If they don't have the parts I need, it's no problem at all. I can get the valve and any home improvement store (and it will be better!) and the special thumb nut that holds the motor on can be subsituted with a regular stainless steel nut. It's only "special" so you can reach it but a regular nut can be put on and taken off with a plain old deep well socket. I still want the original thumb nut if possible, though.
Last edited by ZoneIII; 03-31-2008 at 02:54 PM. Click to view previous post history.