[R-390] Selenium Rectifier

[Roy Morgan]

At 09:26 AM 11/17/2005, Barry wrote:
>Tim,
>
>That's close enough.  I figured an amp or two would be a sufficient rating
>for a replacement rectifier.  K101A and K101B are all that's powered by the
>rectifier, right?  I'm not looking at the schematic, but does anyone know if
>the break-in relay is also powered from this rectifier?

Yes someone knows: Me.

The break-in relay is powered by the 6.3 volt filament supply. It's coil 
carries about 40 ma of ac current if the "Break-in" switch is ON and the 
rear panel terminal is grounded.  The break-in relay in turn grounds the 
audio input to the audio amplifier and operates the antenna relay.

This means that you can't operate the break-in function with a simple 
transistor switch from the ricebox transmitter or transceiver you have.  It 
needs either a simple contact closure, or some sort of bridge-fed 
opto-isolated solly state switch.

Roy

- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
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