Thread: 21ESP4 Needed
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  #3  
Old 09-13-2010, 06:52 PM
dieseljeep dieseljeep is offline
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Join Date: Jul 2010
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I checked the old Radioshack catalogue website and they showed three tubes that subbed the 21ESP4. 21CEP4, 21DEP4 and 21DAP4. 1964 price $26.95 .
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