[NJARC] BC-348Q Power Questions(2 of them)

[Scott Roberts]

Well, this should be easy...

I'm still repowering the BC-348Q, and in doing so,
configuring it back, for the most part, to original. I
have reconnected all the tube heaters as they were,
and am finishing off the 24V side of the house. I am
coming up with a question about power reduction...

When the aircraft power (24VDC) comes into the set, it
goes through a fuse, and then to the AVC-Off-MVC
switch, which also controls power to the set, by
switching on and off the power to the Dynamotor. Also
connected to the switch are the dial lamps: 2 No. 44
bulbs(6.3V, .25A), connected in parallel to the
dynamotor, and in series with each other and a 200 ohm
rheostat and 60 ohm resistor to ground.

My first question is, Since the dynamotor is removed,
do I need to dissipate part of the power which
operated it through a resistor to ground, in its
place?  My thinking is, I have 24VAC going through 2 x
6.3V (total 12.6 V) #44 bulbs, and a rheostat and
resistor, and I don't want to cook any of them. I was
wondering if  the current not used by the removed
dynamotor would be a problem, or not, and if putting a
resistor to ground in its place would alleviate any
such symptom.

My second question is related to line current. When I
received the set, it had a 110AC 3 wire plug in place.
I wish to reuse this same wire & plug. But my wonder
is this- I have the 24VAC grounding at points, and the
250VDC I'm sure grounds over somewhere, so is it ok to
ground the chassis itself with the third wire? I'm
pretty sure the other internal groundings are fine,
but I wondered about the ground wire on the plug- I
don't want a hot chassis...


Thanks!
Scott

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