I have a BRAND NEW manual ordered from heathkit 10-6-78 and simply filed away. no markings, spine not even creased or broken. Invoice included dated 1978. Collector quality to go with your collector SB-220 amp. FS or trade: would like dx-20/35/40/60 xmtrs, hr-1680 rcvr, sp-600 speaker etc. van 612-440-1735 eve 612-713-4027 days wd8aam