OK, technically this belongs in "Effects" but it has tubes in it so I put it here...

From the user's manual:

"The GA-4RE records music with an electronic pen.  The record is made on a film of oil which also serves to lubricate the revolving disc which is the platter for the film.  The film is constantly replaced and can never wear out like a magnetic tape.  Following the electronic pen are two sensors which reproduce the pattern of electrons for the amplifier.  The effect is a multiple choice of echo and reverberant sound with a quality never before achieved."