Hi, all. Here is a fairly simple way to upgrade your Telrad. It's a 1.5 Watt heater powered by a rechargeable 5 volt USB battery. The battery powers both the reticle and the heater. Instructions here:
How to make a 1.5 Watt Telrad Heater
Enjoy! -- BC
How to make a 1.5 Watt Telrad Heater
Enjoy! -- BC