[Hammarlund] Collins 3.1 KC filter question

[k2cby]

I inherited an SP-600 that had been used by ITT in point-to-point teletype
service during the 1950s and '60s. I also got a couple of 7-pin plug-in
adapters of the sort you describe containing a tube socket and mechanical
filter, which I later sold. I was told that ITT had experimented with the
Collins filters in the SP600s.

 

Miles B. Anderson, K2CBY
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Sag Harbor, NY 11963
Tel.: (631) 725-4400

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e-mail: k2cby at optonline.net