VINTAGE RADIO:Healing M602T transistor manteli radio

摘要

I picked up this transistor set at an HRSA auction a while ago.It's an Australian set,compact and easy to use.I recently described Healing's fine valve portable,the 404B(April 2019;siliconchip.com.au/Article/11533l.So we can now directly compare that to the six-transistor M602T from the same manufacturer.The M602T was released in 1960 and followed on from the designs that had matured by the late 1950s.It uses six alloyed-junction transistors: three in the RF/IF section and three in the audio stages.This puts it in the second generation of transistor sets.The short-lived first generation used inferior grown-junction transistors.So as well as comparing this set to the valve radios that were designed just a few years before it,we can also compare it to the transistor sets which came soon after(ignoring the few hybrids which bridged the gap).