I have one NEW AND UNUSED Topaz 91091-31 transformers for sale. These are great for use with DAC, headphone amps and pre-amps to clean up the noise coming from your mains. These can be configured to input or output 120v/240v and can also be wired for balanced power. I am asking $111 shipped including PayPal and insurance. Look here for more information on the benefits of these transformers: https://www.head-fi.org/threads/top...ansformers-for-affordably-clean-power.857448/ Here’s an example of how one would look with wire attached for plugging straight into a DAC or headphone amp.