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This is a Radio Frequency Amplifier AM-2785A/URA-36, Serial Number 2. It consists of
the units you see here (described below) plus the big, 160-pound power supply shown at the bottom.
This is a PAL-500 transmitter.
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Power supply PP-2766/URA-36, Serial number 2 front panel.
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Amplifier AM-2785A/URA-36, Serial number 2 front panel.
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ID Tag.
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ID Tag.
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ID Tag.
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Auxillary power panel APP-4.
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Auxillary power panel ID tag.
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Amplifier AM-2785 - top view.
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Amplifier AM-2785 top view. The scale of the final output tube makes this 6146 driver
look like a miniature. I am told that this is an Eimac PL172. These tubes go for $800
or more these days.
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Amplifier AM-2785 closeup of that monster Eimac final output tube. It is about 5" across.
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Amplifier AM-2785 detail of vacuum capacitors.
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Amplifier AM-2785 detail of tuning.
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Under chassis of amplifier Amplifier AM-2785 showing gear adjusters for
vacuum capacitors.
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Amplifier AM-2785A showing cable with "AT" connector.
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Closeup of "AT" connector from cable coming out of amplifier AM-2785A.
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PP-2766 Power supply back view, Serial number 2.
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PP-2766 Power supply back view.
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PP-2766 Power supply, under-chassis view.
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PP-2766 Power supply, closeup of after-market modification - capacitor and relay.
Maybe some kind of power-up delay?
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PP-2766 Power supply, rear view. This weighs about 160 pounds.
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PP-2766 Power suppl ID tag. Serial number 2.
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PP-2766 Power supply front panel. Screen on right is intake for squirrel-cage fan.
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PP-2766 Power supply top view showing the two high-voltage rectifiers and the
cable with the big "AT" connector.
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