Deep in the bowels of my junk I found some resistors for a test of the whole modulation section of the Gates BC-1T. I put five large-ish (each like a roll of quarters, maybe 50 watts?) 800-ohm wirewounds in series across the secondary of the modulation transformer. Thaty would seem a good load: 4000 ohms. I put an RMS voltmeter across one of the resistors in the stack.
Applied tone to the input... enough drive to produce 200 mA of combined modulator current produced about 100 volts across the one resistor. 400 mA got me about 200 volts. And the tube plates were medium-glowing at 0.2 A (what I'd consider normal for 833 modulators) and quite brightly glowing (more than I'd like to see on an 833) at 0.4 A. Didn't run it too long, but after I shut it down the resistors were hardly warm at all. Steve WD8DAS ************************************** AOL now offers free email to everyone. Find out more about what's free from AOL at http://www.aol.com. ______________________________________________________________ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
