L and R channel/Red and White in system chain

I'm going crazy over this and I feel totally confused + angry. Anyone up to solving this puzzle?:

Turntable junction box: color coded white and red;
Phono preamp: engraved R(ight)(white terminal) and L(eft) (black terminal);
Rumble filter: no color coding; just L and R input and output terminals, both white;
Main integrated amp: no R or L but only Red and White inputs (CD player that's partner to the amp says Red is Right and White is Left channel)

I am so confused as to how to connect the cables it drives me nuts. I thought Red is always Right channel; but my phono preamp has Black marked as Left and White as Right.

The rumble filter has no color at all and only says R and L, but if my main amp Red/Right and White/Left that different from the phono preamp. The sound seems ok in either combo but it angers me that I have to play a guessing game with high end stereo equipment. Please advise.