Another 4-1000A Amplifier

(designed and built by W7AX)

Click on the thumbnails to get a larger view of the photo. This amp is still under construction. The tuned circuit for input tuning had not been installed when the photos were taken.

Bottom view of the amp chassis. 

This is a shot looking down into the amp from the top rear showing the vacuum cap and roller inductor.Tube is to the forward and left. The tube was mounted in this position in order to see the plate in the tube when the amp is on. (saves on dial lights ! )

This is a shot of the turns counter dial. These were made in 1942!

This is another closeup of the mounting for the plate tuning cap.

This is a closeup of shafting and turns counter mechanics.

This is a shot of the final stages. Note the stainless steel screen in front of the tube.(dial light ! )

Another shot from a different angle showing the final stage

This is the control panel for the amp.  Of course the power switches are on the left and power and high voltage indicators to the right of them.   Since this photo was taken, additional circuitry has been added that allows the operator to adjust the input voltage to the power transformer to allow for precise adjustement of plate voltage.

The interior of the control panel showing the plug-in relays.