Marshall Valvestate 8100 Effects Loop question

[just dave]

Hello,
Thanks in advance for any help given.
The issue Im having is with my effects loop "Send" input. The loop sounds incredible with my pedals but half the time I have to jiggle the cable thats in the "Send" input to get it to work properly. I still get sound but no effects. Ive tried multiple cables(brand new ones and old ones). It doesnt happen all the time but seems to be happening more often. Do I just need to have a new input put in?

[Jazz P Bass]

Resolder the jack.
If that fails, replace it.

[just dave]

It looks to be a "cliff" jack. Ive found many different ones online that look very similar. Any idea which I would need(I dont have s-matic?

[Jazz P Bass]

Did you reflow the pads?
Cliff jacks are open frame so you should be able to at least clean the contacts.
Here is the jack description from the Marshall 8100 parts list.

J3B60005A JACK 6.35MM 4 PIN PC S122
As Used: JACK 6.35MM 4 PIN PC
Notes: "INPUT,SEND,RETURN,LINE OUT"

Parts is Parts can supply it.

[just dave]

Thanks for the info Jazz, I appreciate it!