![]() This measure is standard in Ameritron higher priced amplifiers, and a common mod to update older amps like the Heathkit SB-200. I also install an arc protect fuse and resistor in the HV lead. This web page is a detailed step by step supplement to the W8JI instructions. If you have an older model AL-811H which does not have these design updates, I urge you to install them, or send the amp back to Ameritron for rework to current specs. This amp is not the only grounded grid tube amp that needs this protection it has become a problem, due to inferior tubes of today. There are also reports on eham reviews of receiver front end destruction due to tube arcs getting back to the transceiver. There are certain design measures in the W8JI updates that protect the amplifier from damage if arcs occur. I would encourage you to spend the extra money to get the AL-811H instead of the 3 tube model, if those were your options. ![]() The lowest priced amplifier, the three tube AL-811, lacks neutralization and some other important design features that are included in the AL-811H. The AL-811H has the essential design elements for a clean, stable signal. The modern components are rated to deliver reliable, effective HF communications power levels if operated within their specifications. The Ameritron AL-811H is an attractive choice as an entry level amplifier for the low budget amateur operator. W8JI Ameritron AL-811H Modification Photos & Instructions
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