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I’m guessing it was designed at the Christmas party and they were all drunk. After each modification the amplifier was firmly tested and plates never becames red. AF6LJAug 1, Test and adjust the SWR also on the other bands. G3YROAug 1, That ‘s nothing compared to a deceased tubeamerirron, or worse a faulty transformer. Turn per band load and plate control clock and anti clockwise and watch if there is any anode or grid amerittron.
That was not the diode I was thinking of. Hopefully it didn’t smoke the meter With this methodthe distance between S1 and C26 changed to a small capacitance in parallel with the load capacitor and the total inductance of the coil 10 m is thereby reduced.
Your name or email address: The Ameritron amps I’ve seen aren’t poorly made. The powerful spark induced scorching and inside a hole in the glass. Not close to L4 but far away on the PSU board. Arcing is a momentary short flashover in one of the transmitter tubes. Irregularities in the schematic. Many thanks for that Glen. I can hear at least one of the relays going over, but the SWR into the amp is very high.
However, here are photos of the circuit boards, one for the amerutron version and one for the later version. I wouldn’t supersize that diode, it is a weak link for a reason as I understand it. As radio amateur time is free and one can modify at random time. Because there size s little space was to the valve sockets. In reality, no way to predict how the circuits actually behave.
It is a cheapsimple and proven effective method. The size of the 10 m coil has become too small due to mounting method. I used as “earth” the screw at the bottom of the anode choke.
Roger, you must be the only person in your area that is willing to tackle ham amplifiers with problems. Please note that the output in the table is partly achieved by exceeding the maximum grid and anode current.
Connect the amplifier to a dummy load and adjust for maximum ouput. T he least IMD is produced with that power. On the other bandthe SWR will be high and is an internal tuner required for full ouput. For decadesI advise to mount a resistor and fuse in series with the anode choke as flash over protection for tubesrectifiers and transformers.
I am wondering why you say the amp is awfully made. No the meters are both OK.
Register for a free QRZ account. My inspection yielded a burned grid resistor and a partially conductive varistor on.