Knight-Kit KX-60
The Knight-Kit KX-60 is a lightly documented audio model from the early 1960s. The clearest period notice appeared in Audio in December 1961, and it reads like a spec-sheet capsule. Harmonic distortion is under 1% at full output. Hum is rated at -90 dB at the tuner input and -60 dB at the phono input (Audio, December 1961, p.78). Those figures suggest a transistor amplifier with phono and tuner inputs, sold as a kit under the Knight-Kit name.
By September 1962, Audio had gone deeper into the circuit. The signal path ran from pre-driver TR-12 directly into driver TR-14. From there it went through transformer T-2, used as a phase inverter for push-pull output transistors TR-15 and TR-16 (Audio, September 1962, p.56). That is about the extent of the documented record.
No production years, original price, wattage rating, or full specification sheet has been found in the materials available to the Archive. An original manual or an Allied/Knight-Kit catalog page would help a lot, since the page is built from a few magazine mentions.
Known details:
- Harmonic distortion: less than 1% at full output
- Hum: −90 dB at tuner input; −60 dB at phono input
- Transistor output circuit: TR-12 (pre-driver), TR-14 (driver), T-2 phase inverter, TR-15/TR-16 push-pull outputs
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