Amatron 811h Amplifier Power Supply Schmetic Diagram. Ameritron hf power amplifiers are the most popular hf amplifiers in the world. Ameritron is the world s high power leader.

The al 811h uses four 811a tubes in a class ab2 grounded grid circuit. Purchased new al 811h amplifier and it failed after a week. The al 811 is a grounded grid linear amplifier developed by ameritron using low cost 811a power triodes.

After about a week it would tune and then amplifier plate and grid meters would go haywire.

The al 811h uses four 811a tubes in a class ab2 grounded grid circuit. More power does not seem sensible when considering that hv transformer is used in both al 811a with 3 811a and al 811h with 4 811a. Amazingly the 811h has become the largest selling amplifier in the world. Ameritron is the world s high power leader.