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TUBE: UCH81 - PS:19 V - 3 BAND 7-14-21 MHZ .. IF : VARIABLE 200-500 KHZ . XTALS- 7.5...14.5...21.5 MHZ ......Pre Sell...,Mixer...,Xtal Osc..,Regen Dedector....All in single tube.....Mini Super...www.qsl.net/wd4nka........All info in this web site..(thanks Gary, WD4NKA)