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Some diagrams and schematics from RCA BC100 broadcast mixer to follow.
 

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RCA BC100 preamp.
 

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  • RCA BC100 preamp3..jpg
    RCA BC100 preamp3..jpg
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RCA BC100 eq (BE100).
 

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  • RCA be-100-2eq.jpg
    RCA be-100-2eq.jpg
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RCA BC100 signal flow.
 

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  • RCA BC100 sinal flow..jpg
    RCA BC100 sinal flow..jpg
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Instructions for RCA 41-B
[submitted by: dmp]
 

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  • RCA41B-1935.pdf
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UOAB schematic and notes
[submitted by: pucho812]
 

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  • UOAB-notes.pdf
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RCA BA-72A, very often found as part of the BA-41A package which replaced the BA-31 standalone. 
 

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  • BA-72A.jpg
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MI-9357A theater preamp.  Some of these output transformers are really 10K DCR primary, some are not.  Curious. 
 

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  • MI-9357A.jpg
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The complete RCA BA-6A manual, scanned by me, part 1 of 2:
 

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  • RCA BA-6A manual pt1.pdf
    1.8 MB · Views: 105
The complete RCA BA-6A manual, scanned by me, part 2 of 2:
 

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  • RCA BA-6A manual pt2.pdf
    1.7 MB · Views: 95

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