1. MT389
2. MT388
3. WMT389
MT388 AND WMT388
Frame mounting ears are on 1.375 inch centers, and bushings are on .625 inch centers. Jacks are double, 2-conductor type with a crossover wiring feature. If a mating plug is inserted in either bushing, crossover contacts are opened (see schematic). MT388 (solder lugs) is equivalent to WEco jack 410A, 410C and 410D. WMT388 (wire-wrapping) is equivalent to WEco 410AM.
MT389 AND WMT389
Double, 3-conductor jacks with both the tip and ring circuits interconnected (crossover wired) so if a plug is inserted in either jack, common circuits are opened (see schematic). MT-389 (solder lugs) is equivalent to WEco 482A. WMT389 (wire-wrapping) is equivalent to WEco 482AM and 482BM.
SPECIFICATIONS
Frame and Stack Screws: Steel, plated with iridescent
iridite finish.
Springs: Copper alloy, spring tempered. Solder lugs are
solder coated.
Bushings: Nickel-plated copper alloy.
Contacts: Welded crossbar palladium in shunt circuits. Insulation: Rigid plastic (MIL-type PBE-P, per MIL
Specification LP-513C). Extruded plastic insulating
tubing through stack.
ORDERING
Order by part number from table.
| Part Number1 |
Adjusted for Plug |
| MT388 |
WEco types 298B and 347B MIL types M642/9-1 and M642/1-1 |
| ý WMT388 |
Switchcraft types 411, 412, 413, 420 |
| MT389 |
WEco type 310 MIL types M642/2-1 and M642/2-2 |
| WMT389 |
Switchcraft types 414 and 482 |
ý Special Order only; contact Switchcraft.
1Number MT388 is equivalent to MIL-type M641/11-1
Mounting Screws: #6-32, Part Number P10725, can be ordered separately.
Contact Switchcraft. (Screws not supplied with jacks). |
click here to download a schematic
drawing
(you will need to have Adobe Acrobat installed on your system to do this)
