I'm looking for information on an older Blonder Tongue agile modulator, model FAVM 450-60. The company hasn't returned my calls; can anybody help? There doesn't seem to be anything on the web for this unit.

You might try contacting Sal over at http://tuberadios.com/ He knows or knew Ben Tongue and Isaac Blonder personally. If anybody would know where to find it I would think he would know.

https://www.tvtechnology.com/news/ben-tongue-television-engineering-pioneer-dies-july-4

I finally got through to one of their older techs, and he is going to dig into the archives for some information on the thing; it's about 30 years old!

He sent me a PDF of the instruction manual, which is what I needed; there is another DIP switch that had no setup information. If anyone needs a copy, just PM me.