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The 75S-3B and 3C included 4 positions for plug in of the "FA" style filters. The filters below fit the B and C receivers. Both receivers have four slots for filters.
Usually one is the standard 2.1KHZ SSB filter and the remainder are optional CW, Narrow SSB, etc. I bought one of these receivers, and in the euphoria I asked if all the filters were in. The answer was "yes". I got
the receiver in and found that the fourth slot (marked spare) was empty. Always ask exactly what is included when you buy one of these fine receivers. Some of these filters sell for $300 (08/00) in the collectors
market.
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