My implementation in a Fisher TA-600. I have eliminated the NAB eq function since I don't need that. Installing a jumper wire between terminal 2 and 3 will convert both tape head and the phono mode to use the same EQ curve. Be aware that loading resistors may be needed at the input jacks. Refer to the information for your particular unit for what may be needed here. Original PEC installed. Dual phono mod was already in place when this picture was taken. New boards ready for install New boards in place And a schematic, because I like schematics. Parts chosen primarily for size, but with a secondary consideration to price. None of this is exotic by any means. Also, I didn't take a picture of the old and new together, but the new boards are about half the size of the original unit.