I have an older model Gallien Krueger 800RB bass amp. The transformer is totally shorted. A new toridal replacement for the original transformer costs about $145. Any suggestions for a replacement source for the original. It has a 7 amp 120 volt primary with two center tapped secondaries. One is +85 and -85 rated to deliver 300 watts with a 4 ohm speaker load and the other is +60 and -60 rated to deliver 100 watts to an 8 ohm speaker load. I am hoping someone can direct me to good source for audio power supply transformers. Thanks