Service Data  
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  Radios  
     
Model No. / Name Year Valve (Tube) / Transistor Line Up
504 556 556/B 1946 EF39(5) ECH35 EBC33 6V6 5Z4G EB34 EM34
640 1947 EF39(4) ECH35 6Q7 6V6 6X5 EB34
659 1947 EF39(2) 6K8 EBC33 6V6 6X5 EB34 EM34
670 1948 UAF41(4) UCH41 UL41(2)
680 680X 1949 6BA6(5) 7S7 8D3 D77 7D9(2) 6AL5 5Z4G VR150/30
740 1950 EAF42(4) ECH42 EL42 EB41 EZ40
750 1950 6BA6(3) ECH42(2)6AM6 DH77 D77 N78 5Z4G VR150/30
820 1955 6AM6 12AT7 ECH42 6AM6(2) 6AL5 EM80 EZ41
840 1950 UAF42(4) UCH42 UL41 UY41
870 1958 12BE6 12BA6 12AT6 19AQ5 35W4
888 1956 6BA6 ECH42 6AM6 ECH42 6BA6 6AT6 6AL5 6BA6 5Z4 VR150/30 6AM6
ALL WORLD SIX 710/B   SEE 740
 
 
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