Topband: Heathkit SB-1000

[Jim Murray via Topband]

Anybody know how to make an SB-1000 tune properly on 160?  Ok on other bands 
but doesn't like 160, dummy load or well tuned Inv.L.   Is it a quirk of the 
amp needing a modification or possibly a bad component?  Saw nothing obvious 
before putting it to use but have not had the cover off since.Thanks,Jimk2hn
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