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I have a scan of the the Sams folder for the 1035 (647-13) - it shows the stereo-mono switch in the screen circuit of the 6EA8 19 KHz amp in the MPX circuit - in mono, this amp is turned off by removing screen voltage. I assume the "mono" function is to get a listenable signal on a weak stereo signal.
I can send the scan if you're interested - PM an address.
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