The changes affect the base-bias resistors. Pick your germanium amplifier circuitfrom the types below. I couldn't find a similar schematic I almost checked all semiconductors resistors capacitors, but all in vain. Convert Your Amplifier from Germanium to Silicon Now, Lets Get Started. GST-3 isa new high-speed IC process technology based on silicon germanium (SiGe), whichfeatures a transition figure (f T) of 35GHz. Unfortunately, the cover had lost all other information. Exploring Europa could be possible in the coming years thanks to new applications for silicon-germanium transistor technology research. Silicon Germanium (SiGe) is the newest innovation for simultaneously improvingthe power consumption, sensitivity, and dynamic range of a receiver. I just replaced them with two BC327, and had to fiddle a bit with biasing, and the audio amplifier worked just fine! The third attemp was trying to repair the audio amplifier of a Siera vintage transistor radio. The two output PNP Germanium transistors (MP41)were also damaged. I had another vintage russian VEF 204 radio. I had to add some cooling stuff and luckily there was a quiesent current adjustment trimmer. 1960s: The next big jump in transistor evolution came with the field-effect transistor. So I replaced them with BC327 for the AC142, and BC337 for the AC141. Gordon Teal built the first silicon transistor, which worked just like a germanium junction transistor. These are hard to get and I needed to get the radio working for somebody who didn't mind modifications, though I prefer vintage repair. I got a Siemens Club RK 231 vintage radio which had two dead audio output transistors AC141/ AC142. If you ever had a vintage gear where you needed to get it to work but needed a replacement for Germanium transistors especially in audio circuits and you wondered if simply replacing with Silicon PNP transistors would work (with some tweaking and minor adjustments), the answer is yes.
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