Heathkit SBA-301-2 Accessory CW Crystal Filter, 400 Hz

[Martin Minnicino]

Does anyone know where I can find a Heathkit SBA-301-2 Accessory CW
Crystal Filter, 400 Hz, for an SB-102?

 

Also, is this a good (i.e., necessary) option for CW?

 

Thanks in advance.

 

Martin Minnicino

PHEnv

 


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