UNBUILT vintage vacuum tube Knight RADIO BROADCASTER & AMPLIFIER repro set kit
NOTE : We sell two versions of this kit, a point-point wired version like the original in this listing, and our NEW, easier assembly, PC board version. See our other listings for that version. Kit comes with two 50C5 tubes, but not 12AX7 tube. Kit includes a BONUS audio input board! The Knight Broadcaster was meant to be used with low level microphone inputs. High level signals will distort the output, unless the input is attenuated. To ease this problem, as well as improve connectivity to audio sources, we have designed an accessory input control board.
The kit includes a small 2-3/8 x 2-3/8 PC board (same blue color), to allow easy connection of bare wire, RCA, or 3.5mm jack inputs! The board also features an isolation transformer, if you experience hum problems. See photos in listing below. This is a reproduction kit of the Knight Wireless Broadcaster - Amplifier. High level inputs can be from a MP3 player, iPod, iPhone, cassette player, etc..The kit also functions as a PA (Public Address) style audio amplifier, and has connections you can hook up a loudspeaker too. This is a custom produced kit, and has no economies of scale, and is therefore more costly than the PC board version. The kit is electrical equivalent to the original, with several minor changes. Our design includes a brand new, high quality, Triad isolation transformer.
Appropriate changes has been made for mounting the transformer on the back, and for internal wiring. We have replaced the selenium rectifier with a modern diode. The kit comes with a prewound oscillator coil. As shown in the internal wiring photo, modern filter capacitors, smaller rectifier diode and oscillator coil, give easier and increased assembly and working room! To keeps costs as low as possible, the kit does NOT come with the 12AX7 tube.The 12AX7 is readily available from many sources. We have gone to great effort, time and expense to acquire vintage style components , like those used in the original design. As shown in the parts photos, the kit currently uses vintage parts, including carbon composition resistors (may be vintage or modern manufacture), phenolic wafer tube sockets, vintage terminal strips, and a vintage compression tuner capacitor. As time progresses on, these parts become harder and harder to find, and at some point may be replaced with modern equivalents. Until otherwise noted, the kit will come with the vintage parts just mentioned. The prototype in the photos used a couple carbon film resistors, but kits will come with ALL carbon composition resistors. The kit now uses black oxide screws to assemble the panels, instead of the costly blue screws shown in the photos. NOTE: This kit requires good electrical and mechanical building skills, and is recommended for advanced builders.
- Country/Region of Manufacture: United States