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21 Mhz IFs- those are pre '52 or '53. Correct? Sencore makes a couple of good generators also. There are a couple of B&K 415's on Ebay right now.
I've also got a Sweep Systems Inc. generator which inputs via the tuner and could be used for 21 MHz IF's.
SSI is what Wavetek was before it became Wavetek.
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