Two Tube Regenerative Radio DIY Kit This radio kit will cover the AM radio band along with the SW radio band. Power for this receiver is 1.5 V DC for the filaments and 45V DC for the plate current. A D cell and five 9V transistor batteries wired in series will work to power this radio. A 2000 ohm headset or an audio amplifier is required. (See Amazon ASIN: B0052EE0AU) Requires two 1T4 tubes (not included).