I have had this for a long time- I forget what it is for. I THINK it is a NB board for a TR4 and/or TR6. I have no idea what its condition is- never used it. Searching on Ebay it looks like the ones in the photos advertised as a Drake noise blanker minus a small metal housing it goes in. I know I am not going to get ebay prices for it ($200+) but make me an offer.