Quote:
Originally Posted by radiotvnut
A new NTE102 audio output got the radio back playing; but, the driver transistor, also crosses to an NTE102, is very noisy (I knew I should have bought the other one that they had). With the signal tracer on the base of said transistor, there is no noise. With the signal tracer on the collector, it's noise city. With the signal tracer connected to the cathode of the detector diode, it's loud and clear. So, that tells me that the mixer and IF stages are in decent shape. Sensitivity isn't the best in the world; but, I don't expect a 4 transistor radio to be a station magnet and others who have this radio also say that it isn't very sensitive. Once I get rid of the noise, I will peak the alignment.
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It's really amazing how well, some of these early designs performed. I mentioned the GE, I had years ago, a large portable with a 4" speaker and only four transistors.
It seems strange, that almost all the pocket radios had six transistors and their DX performance, wasn't that much better. I know that the loopstick was shorter and a few other issues. more later!
