Looking for a Bogen TM-500 (500/600 ohm) 9 pin plugin mic input xfmr. Used in older Bogen CT-100 PA amps.Have a TM-200 (200 ohm) to trade or will purchase. Plan to use the Bogen as part of the audio chain to a Gates BC-250T I'll be putting on 160. 73, Tom / wa6apn wa6apn at charter.net