This amp is almost idiot-proof and able to tolerate my accidental abuse when Alpha amateur amplifiers inadvertently transmit while my SteppIR is still tuning. The obvious fix for this is to rescale the meter to allow for the maximum expected anode current. For those of you who want that extra 3dB of legal power that you can't get with your watt alpha amateur amplifiers on 30 meters, the Alpha 78 works just fine. While the tubes and the power supply in the Alpha 78 are up to the job of delivering watts of CW RF output power, there are a couple of other problems that crop up at this level.
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There's a lot of info on the net for best operating practices, common repairs if required over many years, and what few modifications one might want to consider. Stop in on my web site for a more detailed page on it. Under the current FCC rules that allow for watts maximum CW output power, this resistor can run much hotter. RF output is the key parameter defining amplifier capability.
No component alpha amateur amplifiers issues, even though the output can be way more than the design parameters. A useful tool for safely adjusting the bandpass presets on the Alpha 78 is to fabricate a sheetmetal cover with an access cutout for the bandpass preset tuning capacitors see figure 4. The output power rating should be stated unequivocal References to DC or PEP input are irrelevant and serve only to confuse. Under the current FCC rules that allow for watts maximum CW output power, this resistor can run much hotter.