815 DUAL PENTODE AM BDCST/SHORTWAVE REGEN RADIO (540 KHZ TO 15.50 MHZ) (2024)

I MAKE THESE TO ORDER, SO PLEASE ALLOW 7 TO 10 DAYS FOR SHIPMENT.QUITE UNUSUAL FOR A REGEN RADIO. DON'T THINK I'VE EVER SEEN THE 815 DUAL PENTODE TRANSMITTER TUBE USED IN A REGENERATIVE RECEIVER CIRCUIT, BUT IT WORKS GREAT. ONE OF THE BEST REGEN RECEIVERS I'VE EVER MADE FOR COPYING SSB AND CW ON THE HAM BANDS! THE 815'S ARE A LITTLE PRICEY ON eBAY BUT THE PERFORMANCE IS WELL WORTH SPENDING A FEW EXTRA $$$'S.YOU'LL ONLY NEED ABOUT 12 TO 14 VOLTS DC TO RUN THIS RADIO. WITH THE DOUBLE PENTODE IT HAS GOOD VOLUME AND SELECTIVITY.THE WIRING HARNESS PROVIDED HAS A SEPARATE DC INPUT FOR THE B+ PLATE VOLTAGE IF YOU WANT TO RUN IT HIGHER THAN THE 12 VOLT FILAMENT.I FOUND THAT INCREASING THE B+ TO THE 15 TO 20 VOLT RANGE ONLY INCREASES THE VOLUME SLIGHTLY. SO FOR PRACTICAL PURPOSES IT'S PROBABLY BEST TO JUST PARALLEL THE B+ AND FILAMENT WIRES, USING ONLY ONE 12 TO 14 VOLT SOURCE.THIS RADIO COMES WITH A HI-Z PIEZO HEADSET, WIRING HARNESS AND PLUG-IN COILS. THE 3 COILS PROVIDE CONTINUOUS COVERAGE FROM ABOUT 540 KHZ TO 15.5 MHZ. SO YOU HAVE THE BROADCAST BAND PLUS SHORTWAVE.THIS WILL GIVE YOU MOST OF THE HF HAM BANDS, PLUS SHORTWAVE FREQUENCIES. IT HAS MAIN AND FINE TUNING, REGEN AND ANTENNA COUPLING CONTROLS ON THE FRONT PANEL.THE RADIO WILL RUN ON MOST ANY WELL FILTERED DC SUPPLY VOLTAGE CAPABLE OF DELIVERING ABOUT 1 AMP CONTINUOUS DUTY.IT WILL ALSO WORK WITH BATTERIES, BUT YOU'LL WANT TO USE A LITHIUM-ION OR Ni-CAD CORDLESS DRILL TYPE BATTERY (12 VOLT TYPES), CAPABLE OF DELIVERING THE REQUIRED CURRENT.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.THIS CIRCUIT REQUIRES HIGH IMPEDANCE INDUCTIVE/MAGNETIC OR PIEZO HEADPHONES (PIEZO TYPE INCLUDED).I GUARANTEE THIS RADIO WILL WORK IF YOU HOOK IT UP PROPERLY. I'M NOT VERY GIFTED AT DRAWING, BUT WILL INCLUDE A HAND SKETCHED SCHEMATIC DIAGRAM OF THE CIRCUIT, PLUS A BLOCK DIAGRAM SHOWING WHERE TO HOOK THE ANTENNA, HEADPHONES, POWER, ETC.THE RADIO WILL BE CONSTRUCTED WHEN ORDERED, BUT SINCE THE 815 TUBE AND A COUPLE OF OTHER PARTS ARE USED, I'M LISTING IT AS A USED ITEM. BETTER THAN 80% OF THE PARTS ARE NEW OR NOS. THANKS FOR LOOKING......KW7T**********SHIPPING TO THE UNITED STATES ONLY********* read more

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