Jack for Essence 5

[markusbass]

Hello,
 
I'm looking for a plastic jack used in Essence 5 bass that I'm fixing now. The jack looks almost like a plastic Switchcraft jack but it has additionally 2 contacts that are isolated from a plug and they are shorted when a plug is inserted into the jack. They provide +9V volts for the preamp. I could use a standard stereo jack (and rewire the battery) but since this is an expensive bass, I would like to find an original jack.
 
Mark

[mica]

The original jack is a Switchcraft L113. These jacks are hard to find with the longer bushing length, and we still have them.  
 
We've changed to the Switchcraft 53. No other Switchcraft parts are interchangeable - there are many variations of 113 and 53, but only the specific numbers above will work in our circuit.
 
Use the 53 if space allows - it's far superior to the original. We have both jacks available of course. If you order from me, please have the serial number of the bass so that we can update the records.

[markusbass]

Thanks. Which exactly variation is it: http://www.switchcraft.com/ProductSummary.aspx?Parent=72 ? English is not my native language and I'm not sure what is the diffference between Ring circuit closed and Single closed circuit. So it is 113BX or 113FX? I also cannot find the other type that you mention 53. Is the symbol correct?
I wonder why a standard stereo jack was not used (+different wiring of the battery)? In the bass that I'm fixing now exactly the isolated contacts have failed so it would be hard to say that this specific Switchcraft jack is better than a standard stereo jack.
Was it decided on purpose that +9V is connected to the preamp with this type of jack?  
 
Mark