In order to prevent TID (transient intermodulation distortion) in their Beomaster 4400 (type 2417) tuner amp, B&O used a 50kHz filter before the power amp and feedback techniques to limit the systems' bandwidth. The Technical Product Information book, which accompanied the service manual for this model contained a very detailed explanation of these which can be useful for those interested. Images derived from same are set out below.Bessel filter
Output Amplifier and Internal feedback
Additional notes include
DC feedback and Constant-current generator for no-signal current
Constant current generator for differential amplifier and Dual Transistor output
Excess temperature protection
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