The Model 25 is similar to the Model 20, except that it has what Robert Eby calls a “contemporary case design.” From photos, both models of organ appear to have a similar footprint, but Model 20 has a more fluid shape and curved detailing throughout the console and bench. In contrast, the Model 25 has square lines and a more utilitarian style. It appears that the Model 25G has a similar exterior design, and adds a great to pedal coupler.

According to Eby:

Solo voices [for the Model 25 and 25G] are provided on the five combination pistons with appropriate accompaniment on the other manual and pedals. A great to pedal coupler incorporated in the Model 25G permits the addition of 8, 4, 2 2/3, and 1 3/5 ft. and a string mixture in the pedal division. The Model 40 Tone Cabinet and bench are also standard with the above models.