4/4/2023 0 Comments Sp 600 hammarlund![]() ![]() It wasn't the sort of task which would be worthwhile commercially,īut for hams and short-wave listeners it might be an economic route to a better receiver, either by getting a good tube receiver at reduced price or modernising an already-owned one. to base the reincarnated receiver on.Īn appealing idea in principal, although it could take a fair amount of re-design and construction effort. The usual idea for such a conversion was to take the tuning infrastructure of the original receiver - which in a higher-end model would be where the value lay - and replace the active electronics with solid-state, while having the chassis and other physical elements such as knobs, switches, pots, etc. Some articles were written about the topic in ham magazines (some refs below). With FET characteristics being more akin to vacuum tubes than are bipolar transistors (high input impedance, voltage sensing rather than current), interest arose in converting higher-end tube radios to solid-state. More substantial and higher-end tube radios were headed for surplus and obsolescence.įield-effect transistors had been developed in the mid-1960s and were now becoming available and popular. Simple consumer tube radios were headed for the dump, ![]() ![]() By the late 1960s most of the radio industry had made the transition to solid-state designs. ![]()
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