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![]() "Richard W. Solomon, W1KSZ" wrote in message ... I need a headset for the Instructograpgh I am restoring. Something along the lines of what you see old telegraphers using. I remember seeing some that had two pins on the end instead of a plug. Anyone have something like that ? Tnx, Dick, W1KSZ The phones suppled with the Instructograph were common magnetic phones as made by perhaps a dozen manufacturers. Phones of this sort were made and sold up to perhaps the 1970s. They were never used for wire telegraph work only for radio telegraphy. I seem them very rarely at the local ham swap meet but eBay would do better. You will also need a key. Most of the keys supplied by Instructograph appear to have been made by Signal Electric Co., I had one which disappeared in some move. These keys do not have circuit closers on them. The Instructograph appears to be identical to an earlier practice machine called the Teleplex. They use wind-up phonograph motors to drive them. I have no idea of what sort of oscillator Instructograph supplied, they don't appear in the ads but undoubtedly they had something available, maybe even just a buzzer. Late magnetic phones are nearly identical to the early ones so one must be careful not to pay collectors' item prices for something that is just old. Some brand names are Trimm, Brandes and Cannon-Ball (same company), Utah, Western Electric, Baldwin (valuable), and others. Check eBay, I rarely see old phones of any type at the local ham swap meets. -- --- Richard Knoppow Los Angeles, CA, USA |
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