I have heard of those in some Athearn diesels. At one time Athearn only had the JST connector I believe.
Some years ago, maybe ten, I bought the Roundhouse Steamers DCC Ready sold by Athearn and they came with the JST DC adapter which I removed.
I hard wired a SoundTraxx Micro.
Rich
If you ever fall over in public, pick yourself up and say “sorry it’s been a while since I inhabited a body.” And just walk away.
Way cool about swapping out different decoders. I was fearful of how to add the wires and found that the process is literally plug n' play. The decoders you show are exactly what I have and they are on modern (read DCC ready) Athearn locos. I have one Bachman DCC ready loco and it should work that way. If not, coming here!
Bachmann DCC ready locos are different. There is a HO Bachmann forum with users and company reps and loco diagrams and parts list.
I have some Bachmann diesels and steamers. They have only eight pin sockets. Well so far have never seen JST sockets on them.
Edit.
There are a couple Bachmann with 21 pin but I do not believe they are DCC ready.
I have a 44 ton DCC ready that I had to remove two clips and solder in a seven pin decoder. Same with a 0-6-0 DCC ready.
A lot of engines made in the last 10 years or so have both the 8- and 9-pin receptacles, although in the last couple of years a lot of engines have a 21-pin receptacle instead of one of the others.
Besides what I would think is the hassle of having to open up an engine to take out a decoder and open up another one to add the decoder so I can run it on DCC, there's the concern that everytime you do that you're risking breaking one of pins on the decoder, rendering it inoperative. I'd suggest looking at just little by little adding decoders to all your engines. If you shop in bulk, like say 5 at a time, there are good non-sound decoders you can pick up for around $15 each (maybe less).
BTW, if you've removed a decoder from an engine, you do have to put in a dummy plug to run it on DC. However, the majority of decoders are 'dual-mode' so will work fine on DC without removing it.
Just remember, a dual mode decoder will not start running until the voltage is about seven volts DC. Nature of the beast. It does not need more power, just more voltage. The decoder wakes up at five volts DC.
wjstix A lot of engines made in the last 10 years or so have both the 8- and 9-pin receptacles, although in the last couple of years a lot of engines have a 21-pin receptacle instead of one of the others. Besides what I would think is the hassle of having to open up an engine to take out a decoder and open up another one to add the decoder so I can run it on DCC, there's the concern that everytime you do that you're risking breaking one of pins on the decoder, rendering it inoperative. I'd suggest looking at just little by little adding decoders to all your engines. If you shop in bulk, like say 5 at a time, there are good non-sound decoders you can pick up for around $15 each (maybe less). BTW, if you've removed a decoder from an engine, you do have to put in a dummy plug to run it on DC. However, the majority of decoders are 'dual-mode' so will work fine on DC without removing it.