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When clean and properly (lightly oiled) lubed, the tuning is very light and easy to manipulate.

Only Collins or Motorola built the R-390 contracts which ran from 1951 through 1953.

The military complained that the R-390 was very difficult to maintain and too expensive.

Some of the maintenance issues involve the R-390's elaborate electronically regulated B circuit that uses two 6082 tubes along with two 5651 voltage reference tubes and a 6BH6 DC Voltage Amplifier tube.

The R-390 and R-390A receivers have provided reliable communications under adverse conditions for years and even though the design and nearly all of the receivers are over 50 years old, they are still one of the best tube-type receivers around.

This web-article will go through the steps necessary for complete disassembly of the receiver to the individual module level.

The thorough inspection and possible problems to look for in the Main Frame and each of the modules will be covered with individual sections. It is a high performance receiver that really "shows its stuff" when conditions are poor but will also provide fairly nice audio quality when receiving conditions allow for it.

The Power Supply module and the PTO don't have any paper capacitors in their circuits.

Late versions of the R-390A have ceramic disk and film capacitors that generally are trouble-free.

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