A phono preamp with equalization selector

Crusty patina……like most of the posters….myself included….

atmasphere

Ralph, thanks for clarifying those settings

atmasphere

"RIAA being for stereo. AES and LP were two alternate mono-only curves and the ’78’ curve was an approximation of the most common 78 curves of which there were quite a few."

That President II was 1958, the year Stereo LP’s came out.

MONO EQ.: all my 40’s and most of the 50’s Mono Jazz LP’s are playing thru my MM RIAA EQ. Close enough to AES and/or LP EQ?

78's. Using a Modern TT with 78 rpm, correct stylus, they would also go thru RIAA. 

@elliottbnewcombjr Use the 78 EQ when playing 78's; that and the right stylus should help with surface noise.

There are not many LPs from the 1940s, but I suspect you would have to check on the back of the jacket to see what EQ was used. By 1956 most had gone to the RCA Orthophonic (RIAA). As pointed out earlier, Columbia was a late comer but was entirely RIAA by the stereo era (stereo mastering systems were only supplied with RIAA equalization).

ralph,

That Fisher Control Panel is not in use.

I meant: all the old 78's and Mono LPs (I have 30's; 40's; 50's) we are playing, (even when using correct stylus and cartridge) is going thru RIAA EQ in our modern setups