[Heathkit] More Heath performance mods

[wb8jkr at juno.com]

  I have a MS word file (35K) of various mods I've done to
Heath gear over the years, if anyone is interested I can
send the file. It covers the HR-10, HR1680, SB301
HW-16, DX60, SB200, GR54, and the HD1250.

73,  Mark  WB8JKR