Quality Four shortwave receiver uses regeneration for DX
An article by K B Humphrey describes the Quality Four radio receiver designed for high fidelity with minimal tubes. It details regeneration control in two tuned RF stages, transformer coupling on the audio side, and distortion reduction by using a crystal detector. The piece covers coil design, panel construction, parts list, and practical tuning and aerial considerations.
MENTIONED IN THIS ARTICLE
K. B. Humphrey
New York Herald-Tribune
Quality Four
Tts
Testing Old Lamp Cord With Phones And BY Battery
The article explains using a pair of phones and a BY battery to check old flexible lamp cord. Connect ends in series and listen for a crackle. if the phones crack, the wire is intact. If silent, the wire is broken somewhere along its length.
Care in Placing Tubes in the Sockets
Instructions stress careful handling of tubes in sockets as rough use by fans breaks tips and harms contacts. Do not remove tubes from the sockets more than necessary to avoid injury and poor connections.
Tuning the filter coupler for quiet operation
For quiet operation and maximum selectivity in a superheterodyne radio tune the primary and secondary of the filter coupler. Ordinarily two 00025 mild fixed condensers, evenly matched, will do it.
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