Check the listing for details. Dual 1625 Regenerative Receiver AM + Shortwave (535 khz to 17.5 mhz). Condition: Open box. Listed at 268.00 USD. This circuit employs two 1625 tubes, plus a one transistor amplifier for increased audio gain. I make these to order, so please allow about 15 business days for shipment once your order has been placed. Many different color options are possible, so if you want something other than that pictured please inquire. Most anything reasonable I can accommodate. Plug-in coils are provided for continuous coverage, from about 535 khz, up to 17 plus mhz. I have sometimes pushed this circuit up to even 18 mhz, but once you pass 17 to 18 mhz things get a bit iffy. So I promise 17.5 mhz on the top end and hope for a bit more. The radio requires hi-z headphones, of the 2 to 4k ohm variety, either the old standard induction type or something of the hi-z piezo variety. Either will work. Headphones NOT INCLUDED in this listing, but I can supply the type shown in the photo in red. Please inquire about additional cost if you'd like this radio shipped with a headset. I typically use a standard 1/4" jack for the audio output. Please let me know if you need something different? The power socket on the back of the chassis requires two dc voltage feeds, one at about 1 amp capability, and a second dc source of 12 to 30 volts for the plate circuits of the 1625's and the transistor audio amp. The latter power source will only require a capability of a few hundred milliamps. A wiring harness with plug is included so you easily import the necessary power hookups. Regenerative receivers will virtually always sound best if powered with a battery source. However, a well filtered bench power supply will also work fine. About 80 to 90% of the parts are new. Since a few of the parts are from good used stock I am listing the radio as used, even though most of the parts are either new or nos. Controls are main and fine tuning, antenna coupling and a reaction/regenerative control, which also has the power on/off switch. A schematic diagram, showing all parts values, is included with this item. I guarantee this radio will work if you hook it up properly with appropriate power supply and a good antenna. Shipping to the US only.