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JOBO Expert Drum Streaks

Jurgen Estanislao

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Joined
Mar 3, 2011
Messages
145
Location
USA, PH, JP
Format
Analog
Been developing 11x14 and 14x17 negatives in my expert drum for years now, as of late I have been noticing straight streaks on my negatives.

What could be the cause and solution?
 
I have found with the expert drums I have to manually agitate invert and twist for the first 20 seconds of development, I have made this part of our routine for over 20 years .
 
Assuming you are using CPP2 or similar. The nylon gears lost some grip? Also check the cog wheel and tighten its center screw. If worn, they might get slow or skip. You can still get replacement parts from Catlabs.
 
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Here's an example, I am using a 3062 drum on a Stark Rotary base. It's a single streak for the past three or four negatives I have encountered it on the same area.

As mentioned never experienced it before.
 

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Jurgen Estanislao said:
Here's an example, I am using a 3062 drum on a Stark Rotary base. It's a single streak for the past three or four negatives I have encountered it on the same area.

As mentioned never experienced it before.
Click to expand...

I can't see a streak.
 
Here are inverted examples it's a horizontal streak
 

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Perhaps you are taking too long between filling and rotation if you fill with the tank vertical. I fill my tank while rotating using a funnel and and a length of large tubing.
 
Are you using enough active developer? I had this happen with diluted XTOL, used a greater volume of developer and problem went away
 
Those stipes are quite defined for chemical. Are you certain it's not mechanical?
 
I agree. It does not look like a chemical issue… Perhaps a light leak or perhaps, as suggested a mechanical issue.
 
Vaughn said:
Perhaps a light leak
Click to expand...
The horizontal line shown in some of the sheets does remind me of that.

This one looks like at least in part a processing problem, with the edges of the sheet having been exposed to the fixer for only a small part of the time:

There's also signs of foaming in the partly processed areas.
@Jurgen Estanislao does that sheet show signs of incomplete fixing? What happens if you re-fix it?
 
With my CPP2 and the Jobo 3010 Expert Drum I use the '4' speed.
 
Double exposure?
I see architecture, at least in the first photo.
 
Does this match where the seam where the 2 halves of the 3062 drum is solvent welded together? Light leak or chemical retention in the joint?
 
mshchem said:
Does this match where the seam where the 2 halves of the 3062 drum is solvent welded together? Light leak or chemical retention in the joint?
Click to expand...

Yes it seems. Tried out a new negative and changed placement within the tank and it seemed to have solved it.
 
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