Hi Sang,
Welcome to the AH preamp club. I hope you have many wonderful hours of musical enjoyment to come. I haven't posted lately because my VAC amps have been at the factory for almost six weeks now. I originally sent them back for a check-up, but apparently either during shipment to the factory or previously when the amps were shipped to me ( and I wasn't aware of it) one of the transformers broke loose from the chassis so they had to send it to a specialist to have it re-welded and spray painted. There was initially a two week queue before they could even look at the amps, but now there has been further delay due to the transformer welding job. While the amps are there, the tech is upgrading a few parts to improve on the sound as well as lower the noise level. I am hoping to have the amps back to me before Christmas so that I can once again enjoy my main system. Merry Christmas everyone. Have a safe and happy holidays.