Philips model BV575A, 1959
More photos and detailed specification
This radio is a typical
medium sized table type of the late 1950s, but the loudspeaker and
amplifier arrangement are advanced and unconventional.
The power amplifier is a balance amplifier with two special output tubes in series, no output transformer and high impedance loudspeaker. This results in performance which substantially exceeds that of comparable amplifiers with transformers.