Second input on Monoprice/Stage Right amp

[coug64]

2nd input to accommodate Boss RC-202 used as backing track player.  Should I change resistors to tube input grid to 68K each with a 1 meg to ground or 1Megohm resistors to input grid with 100K to ground?  Output of RC-202 is about same as a dual lap steel pickup.

[rake]

IIRC those loopers have stereo outs. Rather than bung up the amp you'd be better off picking up one of those little 4 channel mini mixers.

[Ronquest]

Which amp model do you have?
Exactly what are you trying to do? 
Full signal chain?   Guitar, Mic, RC-202, > amp????
Does your amp currently have 2 inputs or are you wanting to add an input?

[coug64]

Add a second mono input. 

[rake]

https://www.guitarcenter.com/American-Recorder-Technologies/1-4-Male-Mono-to-Two-1-4-Female-Adapter-Nickel-1273887987101.gc?cntry=us&source=4WWRWXGP