What amps/cabs do you suggest from PodGo/Helix to get a low gain tone but with long sustain?

[itsjustashwin]

Here is an example of the kind of tone I'm describing. To me, it sounds like he is using a dual rectifier by keeping low master volume and low gain. That way, he is getting a smooth and sustained low gain tone. What do you guys think?
 
https://www.youtube.com/watch?v=CqDS41ysMU0

[theElevators]

The secret to sustain is compression and a delay with high level of feedback.  Compression can be a compressor block, or simply a low-gain distortion.  I figured out the delay trick a long time ago--a ping-pong stereo delay at the very end of the chain (running in parallel) set at 135.5 BMPs, sync'ed to 1/8th notes, feedback at 60%, mixed to taste (35% for me).  I always run delay in parallel, because when you are in stereo, I want the initial note to be heard in both speakers: left and right.  Otherwise with a delay mixed at 100% the initial note is heard in the left channel only.  Everywhere in the middle, the panning is all screwy when in stereo.  Anyway....  That's my personal formula. 

 

I don't think there's an exact definitive recipe of what amp and cab to use to get any given tone.  I use the Mail Order Twin for every electric guitar sound and can always get my sound (gain-y, clean, feedback, creamy).  For whatever reason, I tried a bunch of different amps in the Helix, and none of them worked as I wanted them to in real life.  I wanted to have an amp that doesn't have a boomy low-end, is not noisy, and could clean up with a lighter pick attack.  In analog world, my amp of choice was alwyas a Fender Deluxe.  For some reason, none of the amps in the Helix would give me the same exact response.  I found Mail Order Twin, and thought it was "Fender Twin" initially from the name, which it is clearly not--it's based on the Silvertone amp. 

[PaulTBaker]

Look up John Nathon Cordy, his tones are like your video, but better IMO.  And his playing is amazing.  He has lots of vids where he will walk you through the complete signal chain.  He uses the Stomp, but it would also translate to the floor.