The only straight tonearms are linear tracking tonearms, the rest of the tonearm with straight armtube have an offset angle of the headshell, so they are not actually straight, except for the very short ones like the ViV Lab for example.
Curved and Straight Tonearms
Over the last 40 years I have owned 3 turntables. An entry level Dual from the '70's, a Denon DP-52F (which I still use in my office system) and a Rega P3-24 which I currently use in my main system. All of these turntables have had straight tonearms. I am planning on upgrading my Rega in the near future. Having started my research, I have noticed that some well reviewed turntables have curved 'arms. My question: What are the advantages/disadvantages of each, sonic or otherwise? Thanks for any input.