Actually the Bugle Pro is a lot better than the Jazz for playing 78's and early LPs, because it is more flexible. The Jazz has only three turnover settings (275 hz, 350 hz and 500 Hz), whereas the Bugle Pro has six (150 hz, 200 hz , 300 hz , 400 hz. 500 hz and 700 hz).
In terms of performance the Jazz is more transparent, I would prefer it above the Bugle Pro for playing LPs in pristine condition since it possesses a CD like clarity, but has the fault that it tends to expose my turntable rumble... The Bugle Pro is extremely musical and to my ears has a better defined bass than the Jazz and is very good at covering some of my turntable faults and defects on the vynil surface.
Of course my opinions are enterily subjective. My listening was done on my Garrard 401 with two tonearms: a Hadcock tonearm with a Decca Gold cartridge and a SME 3009 with a SHURE V15VxMR (I use a Shure 78 for playing 78s). I used a pair of QUAD II valve amplifier and a QUAD QC-twenty four preamplifier to drive a pair of QUAD ESL 57 electrostactic loudspeakers that were refurbished by Wayne Picquet .
In conclusion, Hagerman has in my opinion done a wonderful job in the design of this phonostage and it is perfect for people -like myself - that have a record collection that includes 78s and LPs. In the end I think that I will be using both phonestages for listening to records, and I am now planning to sell the Esoteric Sound requilizer since, though useful, is in another league.