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Salut! CO-257 este echivalenta cu 2K2M,dar mai buna,in sensul ca la aceiasi tensiune de alimentare anodica si de ecran puterea este ceva mai mare.CO-242 la fel,sint mici diferente intre ele.Pe vremuri regretatul YO8DD lucra cu un emitator echipat cu CO-242 in oscilator,urmat de un CO-257 in final.Schema a aparut intr-o revista Radioamatorul prin anii 56,parca.Pe schema in dreptul simbolurilor tuburilor era trecut(2K2M).Atit pot sa-ti spun,nu stiu daca te ajuta.Cu stima,Sandu.

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