[MRCA] BC-187 Transmitter Voltages?

[WA5CAB at cs.com]

Actually, some components were ordered as late as FY '44.

The wiring isn't actually a part of either of the two chests, just attached 
to them.  The wiring all had its own independant CD- nomenclature.

In a message dated 2/28/2007 8:53:43 PM Central Standard Time, 
kk5f at earthlink.net writes: 
> Warning:  This page is wrong about the filament voltage.  It states it as 
> 1.5 volts, but both the VT-25 (type 10) MO and VT-55 (type 865) PA tubes 
> require 7.5 volts (DC) for filaments.  This page specifies 500 vdc for the plate 
> voltages, which sounds about right, but I've never tried to put my SCR-178 on 
> the air, and I don't have the hand-cranked generator that would be the normal 
> source of transmitter power.
> 
> On the web page given above, you can also check out the associated screen 
> modulator (BC-188) and receiver (BC-186).  All three units, plus a battery box 
> for the receiver power supply, were packed in a fairly large chest whose 
> front opened and formed an operating desk, complete with a fixture for holding 
> the J-44 key.  Wiring to connect the units together was also part of the chest. 
>  The receiver was a regen with RF stage and audio amplifier (three tubes).
> 
> Why they were making these obsolete dinosaurs as late as 1942 is an 
> interesting question.
> 

Robert Downs - Houston
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