EFJ Viking 500 Power Supply - RT's Radio Home Page
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EFJ Viking 500 Power Supply
Amateur Radio > Vintage Transmitters
The New Power Supply:
Here is the topside view of the power supply chassis from a Johnson Invader 2000. It is in the process of being converted to operate the Viking 500. All components have been carefully removed from the chassis. It has some small areas of surface rust. Some sanding marks from previous repairs were found; some of these were successfully removed by the buffing wheel.
Underside view of the power supply chassis.
These are the original components from the underside of the chassis.
This transformer suffered a catastrophic event! It is not original to the power supply, and it has no center tap for the 2.5 volt secondary; this may be what led to the burnout. It will be discarded, and the new rectifiers will be solid state. Inrush current limiters will be installed at the 240 volt line to the high voltage transformer to limit the instantaneous load at keyup. These tube sockets will carry the 811A's in the modulator.
To be continued.....
Possible update: Chuck Hurley, K1TLI, who has done several beautiful restorations to EF Johnson equipment is looking into making a batch of Viking 500 power supply chassis. That may be a better option than re-purposing the Invader 2000 supply chassis.