Check the listing for details. DIY 1625 PENTODE TUBE AM BDCST/SHORTWAVE REGEN RADIO (540 KHZ TO 15.0 MHZ). Condition: New. Listed at 142.00 USD. I've built and sold close to 100 copies of this radio, with good results. This is a DIY item. You'll receive all the parts, with pre-wound, ready to go plug-in coils, which will give you an approximate coverage of 540 khz to 15.0 mhz, continuous. In addition, there's a ready to go piezo headset, like the red ones that you see in many of my listings. For increased volume the circuit includes a one transistor headset amp. A construction manual IS NOT included, but you'll receive a schematic diagram with all parts values listed, along with all required hardware. I do not recommend purchasing this item if you do not have some experience in making homebrew radios. The chassis you receive will be a 3D dark green plastic print, with a white raised scale for the main tuning dial. THIS IS THE OLD TRADITIONAL 1625 REGEN TUBE THAT YOU SEE USED QUITE OFTEN FOR REGENERATIVE RECEIVERS. A WELL FILTERED 12 TO 14 VOLTS DC POWER SUPPLY (OR BATTERIES) IS REQUIRED TO RUN THIS RADIO (NOT INCLUDED). HOWEVER, BEST PERFORMANCE IS ATTAINED BY USING A 12 VOLT SOURCE FOR THE TUBE FILAMENT AND A SEPARATE 18 TO 25 VOLT SOURCE FOR THE REGEN/AUDIO AMP CIRCUITS. YOU WILL HAVE MORE GAIN AND BETTER REGEN CONTROL RESPONSE WHEN USING A HIGHER VOLTAGE FOR THE REGEN/AMP CIRCUITS. PARTS TO MAKE A WIRING HARNESS WITH THE OCTAL POWER PLUG IS INCLUDED. ONCE WIRED IT WILL HAVE SEPARATE DC INPUTS, WHICH WILL ALLOW YOU TO SIMPLY HOOK THE TWO WIRES IN PARALLEL WHEN USING A SINGLE 12 TO 14 VOLT DC SOURCE. BUT AGAIN, YOU'LL GET MORE GAIN WHEN USING THE 12 VOLT LINE FOR THE FILAMENT, THEN FEEDING THE PLATE B+ LINE WITH A SEPARATE 18 TO 25 VOLT SOURCE (30 VOLTS MAX). THIS RADIO HAS MAIN AND FINE TUNING, REGEN AND ANTENNA COUPLING CONTROLS ON THE FRONT PANEL. YOU'LL NEED A WIRE ANTENNA OF AT LEAST 25 TO 50FT IN LENGTH, ALONG WITH A GOOD EARTH GROUND. A 75 TO 100 LENGTH ANTENNA WILL PERFORM BEST ON THE LOWER FREQUENCIES. AS STATED, AN ANTENNA COUPLING CONTROL IS PROVIDED FOR ADJUSTING TO DIFFERENT ANTENNA LENGTHS. I GUARANTEE THIS RADIO WILL WORK IF PROPERLY CONSTRUCTED AND HOOKED UP PROPERLY TO AN ADEQUATE ANTENNA AND EARTH GROUND SYSTEM. WITH THE EXCEPTION OF THE 1625 TUBE, MOST OF THE OTHER PARTS ARE EITHER NEW OR NOS. THE 1625'S ARE NO LONGER MANUFACTURED, SO YOU WILL RECEIVE EITHER AN NOS OR GOOD USED 1625 VACUUM TUBE. THANKS FOR STOPPING BY......KW7T **********SHIPPING TO THE UNITED STATES ONLY*********