![](https://www.musicincmag.com/images/gear/Heritage-Audio---HA-609A---Right-Facing.jpg)
The HA-609A is a modern take on the classic transformer coupled diode bridge compressor/limiter design, with several improvements brought in to accommodate the modern workflow. While some classic iterations of this design utilized some IC chips and a class A/B amplifier stage, the HA-609A features an entirely discrete, class-A design and a total of three Carnhill/St Ives transformers per channel.