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November 3rd 06, 12:39 PM
posted to rec.radio.amateur.boatanchors
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National NC-120 audio transformer
"Richard Knoppow" wrote in message nk.net... "Don" wrote in message oups.com... I need an audio output transformer for an NC-120, which I understand is the same as the military RAO. I have also been told the NC-100 is the civiliam model. The ROA-2 manual lists the transformer as 36000 ohms to 600 ohms but the NC-100 manual lists it as 5000 ohms to 500 ohms. Is the 36000 a misprint? The transformer couples the 6V6 to the loudspeaker. The National number on the transformer can I took out of my NC-120 is CNA-30884 Thanks The NC-100 has a number of differences from the RAO, for one thing is has 2 RF stages. The two use different output I mean the RAO has the extra RF stage. tubes which may account for the different transformer. 36K does sound like a rather high load impedance for a 6K6 though, more typical is around 10K. The only power output spec I could find is for the headphone jack, which is parallel with the speaker terminals, 0.3 watt, that's low for a 6K6, more typical would be around 2 watts. -- --- Richard Knoppow Los Angeles, CA, USA |
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