[Boatanchors] National NC-100XAM? (long)

[Bob Young]

I just bought a NC-100XAM on ebay, at a pretty good price and very nice cosmetically and mechanically, I went and picked it up in the boatanchor hauler. I can find no info about this radio, Raymond S. Moore's 4th ed has it listed but no info anywhere even though I found a very comprehensive list of National Catacomb radios from AMfone under receivers.
The tag says NC-100XA but it also has another tag that says type: NC-100XAM, ser # 13, 8-8-40 and order # is blank. It was supposed to have been made for the Navy, it's black wrinkle and is a rack mount. It seems similar to the army NC-100ASD except for it's range: .54 to 30 Kc like most of them. It has the push pull switch (for the meter?) instead of a toggle switch, it's got binding posts for the antenna hookups. All tube sockets are porcelain and the tube compliment is:
V-101 6J7 (supposed to be 6K7?)
V-102 6J7
V-103 6J7
V-104 6K7
V-105 6K7
V-106 6FG8
V-107 6C8G
V-108 6J7
V-109 6F6
V-110 5Z3 (I think, no number but looks like one).
The seller powered it up but I assume didn't hook up a speaker and there was a BIG fuse in it. This back has E102: speaker out (500 ohms?) and E103 which I assume is for a field coil, (one of the pins comes from the power transformer then to the one of the rectifier tube pins, haven't traced the other one). I can't find a schematic for it. The chassis layout is also different than the regular NC-100XA's. It has 4 electrolytics, 4 mf 600 V cans. and the if transformers are laid out differently. The power transformer says NC-100F on it. My main question is do I need to hook up some kind of a choke or power resistor to E103 or can I power it up with just a 500-8 ohm transformer from the speaker output and leave nothing connected to E103? The string that moves the indicator needle is also broken.

Thanks,

Bob
KB1OKL

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