I have a D-104 That I bought new back in the mid 1980's that I've never used. I was going to use the D-104 with my FT 897 but I never got around to buying the tool to wire the plug for the 897. The 897 went belly up and I now have a brand spanking new 7300. I've got the Heil low to hi Z transformer sitting in a box somewhere. I'm wondering what this mic would sound like on the 7300 with the original mic cartridge, or should I just get the kit from Heil and install it into the D-104. I also think that I read somewhere that I'll need a capacitor to isolate the +8 volts on the audio line. So what do the experts think?