Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. Maybe some else will jump in with some other pointers too.Īll information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. These are all things to look for if your amp is working normally. Watch the high voltage at full out and make sure it is not dropping to low, 300-400 volts drop is about right depending on how stout the transformer is. You should see about 500 milliamps, which is a reference which you should not exceed. You should see around 90 milliamps of current. To do this key the amplifier with no carrier or RF input. 1800 volts is probably the minimum you would want to run them at, they run better at around 2500. You have to be very mean to them to make them go south. The 572b tubes are a very durable transmitting tube. I think the voltage sits around 1800 volts according to the meter, but I'd have to check to make sure. So does it make sense that it could go through tubes just sitting on stand? And why would it do that? Could it be that the power supply voltage is too high? But after a little while it would start dropping off on power so I let it sit on stand by for several days and everytime I checked it it would be doing less power and now it only does about 80 watts. When I got it it would only do 100 watts so I replaced the tubes, let it sit on stand by for a day and then it would do 800 watts for a while. I have a Ameritron AL-811 that has been converted to use 572B tubes.
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