Well, I just went and looked in the junk box, I have both a TL-075 and an RC4136, one dated 1980, the other 81, which is part of the reason I'm not 100% sure which is quieter, it would've been back then I last had a go at it.
I don't have the time or an easily available LA-4 to try it in, but I would be happy to donate them to the cause if whoever wants to try it out reports back to class...