Radio Projects: Collins Commercial Radios
The pages are used to allow easy exchange of documents, pictures and project information with fellow radio amateurs. Thus a detailed description, manuals, pictures of whole systems is not found.
List of Systems/Sets Covered
- 51S-1 Receiver
Solve the 6BF5 mystery:
→ Audio PA Modification to reduce heat and keep the 6BF5, Instructions
also refer to Restorer's Note→ Care of Series-Parallel Filament Circuits - 651S-1 Receiver
Display problems? Noisy Fan? Look here:
→ Display Tubes/LEDs, noisy Fan and P.S. Capacitors: Pictures, Text & Diagrams - HF-8010 Exciter
Later: various updates - HF-8020 and HF 8030 Power Amplifier and Power Supply
Later: repairs
also refer to Restorer's Note→ Preparing Transmitter Power Tubes for Use after Storage - HF-8050 Receiver
Later: continuous tuning, other mods, repairs - HF-8054A Receiver, circuit diagram not easily found:
→ Late High IMD RF Unit 637-1767-003, Diagram and Picture
→ Large Diagram of High IMD RF Unit -003
Late High IMD RF Unit 637-1767-003, note mixer PCB on left side
- Later for HF-8054 receiver: continuous tuning, installing narrower filters, other mods, repairs
also refer to Restorer's Note → Solid Tantalum Caps as Power Rail Filters
