View attachment 3264374 Well, there''s a short answer, and a longer answer. Short answer first:
- If you own a 4001, feel free to put whatever strings you like on it. It's your bass, and your warranty expired a long, long time ago...
Now, the longer answer, which concerns neck pick up location, and RIC's warranty policies:
- Neck Pick up.The two Ricks in the picture are mine; an '01 COY 4003, and a '73 4001. See where the neck pick ups are? The pick up location is why you need to need to be a little concerned about your strings - and your 4001. Up until about 1978 or so, 4001's have the neck pick up right under the fret board, sitting in a routed hole that's
waay bigger than it needs to be. We call it "The Bathtub Rout". Because of it's size, and because it's located where the center part of the body transitions into becoming the neck, there's
very little wood there. So little, in fact, that using high tension strings can eventually cause a thing called "Negative Neck Angle". It's where that very thin spot begins to act like a hinge, and the entire neck starts to tilt up - like a draw bridge opening. It can be fixed - if it doesn't get too bad - but its time consuming; not many luthiers can do it; and, yes it's
very expensive. Rickenbacker finally fixed the problem, in 1978 or thereabouts, by moving the pick up back (where it is today), and by not routing a hole big enough to easily hold two pick ups.. So, if you have a 4001 like mine? I think it would be wise to use strings that were relatively low tension - and keep a close eye on the neck...

- RIC warranty policy. Rick's have a weird warranty, that starts the day the instrument was
made - not the day it was
bought. Also, RIC's policy has always been to refuse to honor that warranty with a thing called "
failure to use approved strings". This little trick is the main reason for "Don't use rounds on a 4001". Rick 4001's came from the factory with 40-100 Maxima flatwounds; if you sent it back to them with, say, Roto 66's on it? Sorry; no warranty... And, RIC is still using that excuse today - more or less. The problem is that, other than the factory strings (which, today, are round wounds, and pretty good, actually..), there's
no list of approved strings. Several years ago, someone on the RickResource Forum compiled a list of strings that people had gotten away with using, that
didn't void their warranty; more of a "not disapproved" list than anything else. They also managed to pin RIC's owner, John Hall, down long enough for him to concede that using "strings that were similar to factory strings" would not void the warranty. Which is where we are today...
So, bottom line? If you have a 4001? Use whatever strings you like; but, if it looks like mine? Keep a close eye on that neck. If you're out of the warranty period with a 4003? Use whatever strings you like. If not? Remember - "Similar to factory strings" if you have to send it back...