For sale is a 16 Ohm Hot Plate power attenuator. It is in excellent shape and was tested and it is fully functional. There is a few tiny marks.
The following information is from THD Electronics.
“What is a power attenuator?
A power attenuator is a device placed between the speaker output and the speaker cabinet. It acts like a huge master volume control and permits the amp to be turned up most or all the way while absorbing most of the power generated by the amplifier and turning this power into heat. It passes a small part of the power to the speaker.”