78 r.p.m. records

[ppppenguin]

A standard stylus for microgroove records (LPs) will sit in the bottom of the larger 78 groove. The results are horrible. Purists will have a range of styli for 78s, choosing the one that works best with a given disc. I use a Shure N75-6 stylus (in a Shure M75 cartridge) which is a good compromise for most 78s. Not sure of its exact size.

RIAA equalisation will make most 78s sound bass heavy. You can do an approximate correction with tone controls or build a pre-amp with switchable EQ. A few pre-amps such as the Quad 22 had switchable EQ as standard. Ordinary record players that could play boht LPs and 78s didn't have such switching. You just used the tone controls to get the sound you preferred.