For your consideration: Filtek/BFE SB3 Stereo Broadcast Limiter featuring Haufe audio transformers on the input and output of each channel. Fully analog signal path. German manufacture likely from the early 80's. Racked by Velvet Audio in Hamburg, Germany. Designed as the last line of signal limiting before a transmitter, the Filtek SB3 will start to limit (soft-knee) at +6 dBu, which is the European broadcast standard operating level. Sound is transparent in normal operation, but can add thickening to a mix when pushed. Haufe transformers are among the finest money can buy. Comes with meter calibration instructions and annotated diagram of meter driver board. Unit is in good working condition. Case lid is a little scratched. Please see photos for physical condition. Sold as-is due to age. $800/OBO. Cash, PayPal, Venmo or Zelle accepted. Lowballers will be ignored. Will not respond to "Is this still available?" Listing will be removed as soon as the unit sells. Thank you for your time and consideration.