⭕ For sale a Matched Pair of Vintage 1953 Ampex Model 350 Tube Mic Preamplifiers and two 3741 Power Supplies. They have been together their whole life and are sequentially numbered, Serial #s 53F2x0 & 53F2x1 with matching numbers on the power supplies. This pair originally came with a 350 Full Track deck when it was new so one is labeled a 350 and the other is a 350-R. The 350 has the Peerless B-1153 4627 and UTC HA-133 transformers while the 350-R has the Peerless B-1153 4627 and Peerless B-1154 16263 transformers. This pair is about as nice as you could hope to find. They have been racked and stored in a quiet little radio station for many many years and have very low hours on it. They are both in excellent to mint cosmetic and working condition. Faceplate and paint are super clean. It is 100% complete and original and has never been modified. The inside is as clean as the outside.