F2-B Hi-Z Input Jack Replacement

[oatmeal769]

Hey All,
 
 
I have a vintage F2-B (serial # 712) which needs to have the high impedance input jacks replaced.  These are the ones which switch a resistor in to give a drop in sensitivity, etc.  
 
The trouble is I cannot find a Switchcraft (or any other brand) which accepts a mono signal and SWITCHES OPEN.
 
There are several which will close a switch, but nothing like the original unit, which opens a single switch.  
 
Can ANYONE tell me where to find them?  I've looked EVERYWHERE!!
 
Thanks in advance!

[JimmyJ]

Hey Jeff,
I believe they still make all versions.  Like this:
http://www.switchcraft.com/products/jack-85.html
or this:
http://www.switchcraft.com/products/jack-90.html
Pacific Radio (Hollywood / Burbank) or Electronic City (Burbank) might even stock them.  If not, certainly Newark or Mouser online.
Alembic may be willing to sell you one too but I think it's stock part so you should be able to find it...
Jimmy J

[oatmeal769]

Hi Jimmy,
No, none of those will work (I already ordered 3 and tried...)
Thanks for trying though!
 
The jack in question has an insulated 'nub' on the tip, which opens a circuit without effecting any other connection.  
 
I really have looked all over, at this point I'm kind of looking for what Alembic uses in the first place.  I'd really rather not send it in for a repair I can do in 2 minutes.
 
Here is a picture of the two input jacks on a channel.  The one on the LEFT is the one which needs replacing

[pacificshine]

Jeff,
I thing what you?re looking for is available at Mouser Electronics, (800) 346-6873  www.mouser.com, part number 502-13E  (Switchcraft part).  You can see its diagram in the Mouser on-line catalog on page 1152 accessed from http://mouser.com/CatalogRequest/Catalog.aspx  then enter page number 1152 at bottom right.  Looks like circuit diagram #4 will do what you need, and they have 25 pieces in stock.
--Alan

[JimmyJ]

Thanks for the pic.  That's a Switchcraft 13E - isolated break.  It's not represented in the drawings at the first linked page above but it is listed below.
Here's a link to Newark:
http://www.newark.com/jsp/displayProduct.jsp?sku=39F699&CMP=KNC-G10000675&HBX_OU=50&HBX_PK=SWITCHCRAFT+13E
I don't know if they have a minimum order but at least it shows that the part is still in production.
Jimmy J

[JimmyJ]

Oops, Newark shows no stock but Mouser has 25 available...
http://www.mouser.com/ProductDetail/Switchcraft/13E/?qs=sGAEpiMZZMvlX3nhDDO4AMssdw1fQHKNcxxrsmbWksw%3d
(sorry, apparently links don't work while editing... D'OH!)
Jimmy J
 
(Message edited by jimmyj on February 25, 2010)

[oatmeal769]

I ~think~ that might be it!  I thought I had already ordered the entire switchcraft catalog.  Mouser is great!
I'll try it, hopefully it's the one.  Thanks!