![]() ![]() It already didn’t work so I figured I couldn’t make it any more broken! I had to go at it in small spurts due to my busy work schedule. This Space Spanner seemed like the ideal candidate. That’s way above my current skill level and I need more practice. I’m preparing to rebuild a Hallicrafters SX-28 this year. I guess folks were just supposed to know better than to do that more than once! What I’ll refer to as a self-correcting error. Insert the non-polarized plug in the socket backwards and you’ll get AC voltage on the chassis. All the tubes are lit in a series string straight across the wall line voltage. There’s no transformer isolated HV power supply. ![]() ![]() I’m sure it would’ve been an entry level project when new. The schematic is simple to follow and the circuit is all point to point wiring. Not a lot going on inside this small box. What it lacks in features it makes up in simplicity. I’ve found it quite pleasant to listen to local oldies radio on the AM broadcast dial. But when proper tuned, a station does sound surprisingly nice. The screaming oscillations are the worst! It might be wise to offer up a solid state electrical device as a sacrifice or recite ancient incantations prior to resurrecting one of these demons. Any mis-adjustment of any combination of these switches results in useless noise or screaming oscillations. Tuning in a station is a balancing act between volume, regeneration, antenna coupling, and dial setting. The regen is a funny beast with a history that goes way back to the early 1900’s. Even back in the day there were much better offerings available, but I’m guessing this was aimed more at the general radio listener than hams. They produced a wide array of radio kits for the consumer market. Think of Knight radio as the do it yourself branch of Allied Radio back in the day. It’s a simple tube regenerative AM receiver with a selectable band for broadcast or shortwave. Actually, more than I have working radios. I have an entire shack full of non-working project radios. ![]() I picked up this Knight Space Spanner several years ago in non-working condition. ![]()
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