Restoring my AC-4

Original AC-4

Electrolytic condensers and AC-4 transformer before restoration — Upper part

Internal wiring of the AC-4 before restoration — Bottom part

Restoration beginning

New AC-4 electrolytic condensers — Upper part

Preparation for the new wiring of the AC-4 — Bottom part

Restoring AC-4

Starting the new wiring connections — Bottom part

Preparing the connection of the transformer — Bottom part

Starting to connect the transformer bottom view — Bottom part

Starting to connect the new wiring — Bottom part

Starting to connect the transformer top view — Upper part

AC-4 restored

Lid placed on AC-4 finished — AC-4 fully assembled

Scheme of the AC-4

So that you can see the new values of the DRAKE AC-4 components, I have attached an electrical diagram of the complete restoration of my AC-4 version 5.0 for Spain.

In the primary winding I have put 5 voltage inputs: 215, 220, 225, 230, 235 VAC in order to choose the voltage that you have in the radio room.

Also in the electrical diagram you have the different new values of the different components to get the best performance and maximum reliability from the DRAKE T-4XC transmitter.

The direct current voltages (VDC) are taken with the transmitter running and transmitting from 160 to 180 W on the RF output (this source can also be used with the T-4X, T-4XA and T-4XB models).

Diagram of the restoration to the new version 5.0 for Spain of the AC-4 — Restoration scheme