Be careful about running a Heath HD 3030 on today's line voltages. I burned out transformers in two of them doing that. Now I have 3 running on an eBay bucking transformer and have had no more problems.

I use them to monitor my three 170 internet streams and can patch into any of them at any of the three places I have Teletypes. I also have a Dovetron monitoring Harold's excellent NYT stream and have added that to the fourth of my 6 loops.

Tom N3CRK