Not all Browning receivers are the same. Mark 1's have the Collins filter but are single conversion. Only early Mark 2 receivers have the Collins filter. As the Collins filter jumped in price, all Cb manufacturers stopped using them including Tram, Courier Royale, GE Superbase and others. Hence IMHO, the Mark 2 with the Collins filter is the best CB receiver ever made. Earlier Brownings (R27, R2700) did not have it, nor later Brownings, Later Mark II's Mark 3's and 4's. Some other radios have great audio tone and come close, Johnson 223, Robyn T123 for example, but do not have the rejection and selectivity that the Collins filter brings. A tube receiver with the Collins filter is a killer design. Only thing that beats it is my Collins R390A boat anchor that also is a tube radio with select-able width Collins filters.

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