[AMRadio] The Manual Sez

[James M. Walker]

Ah Not for nothing Gentle persons,

But are you guys paying attention to the different Technical manuals
that have been referenced regarding this BC-610 (*) shooting match?
I have counted three so far, and I accept it as read that, each person
that is referencing "HIS" particular manual is indeed quoting what THAT
manual is stating! I have no argument with anyone about "their" BC-610
I only stated in response to the solid state denigration statement
concerning the "BC-610(*)" That "2500 watts input AC power" is what the
manual says is "required" in order for the transmitter to operate in the
described manner, again per the manual that I have.

I was not trying to start a shouting match over what someone else says
their transmitter model BC-610(*) does or does not do! I only made a
valid reference to the values that I measured on my own units, that
those
units are all original (unmodified) as per the manual that came with
them.

I think there may indeed be a problem with the developments of the
thread,
as folks have interjected their thoughts, and expressed them as "gospel"
and can't seem to get a firm grip on the fact that I am NOT arguing the
point of what someone else has their transmitter set up like, not there
and not my problem or concern! I simply stated the observations I have
made pertaining to my own rigs and nothing else! I have two manuals with
different TM numbers and described as operator/maintainance manuals. I
also marked when I unpacked my BC-610(E) from its crate the two (2)
manuals that were packed with it, The transmitter I have as an "E" model
doesn't have multiple line going to the high voltage transformer, the is
just one pair(ie two leads) that go to the transformer, there is in fact
a 600 watt heater coil (cone shaped) with a light bulb base that is
switched into the circuit when the transmitter mode is changed from FONE
to CW. Also on this unit there is no provision for controlling the AC to
the high voltage transformer with an adjustable transformer (Variac).

My (I) model has 6 terminals on the ac input side, two terminals marked
"com" and a pair marked 110 VAC and a pair marked 115 VAC. the high
voltage output has one set of markings 5740 vac 550 MA DC. On this
transmitter the measured DC to the 250TH is as previously stated, while
the current that this unit dips to while loading per the manual is 390
MA
in fone and 400 MA in CW modes.

Lastly The Eimac manual states that the maximum voltages and currents
"MAY" indeed be increased, as long as the "MAXIMUM" Plate Dissipation
is NOT exceeded for the tube. That is plain enough I think.

Just my comments.
I consider myself a tyro at this here Radio Stuff.
Thanks for reading the verbiage
Jim
WB2FCN

Donald Chester wrote:
> 
> The Manual Sez
> 
> I found my BC-610 manual, TM11-4057, Decomber 1945, BC-610 A,B,C,D.E Repair
> instructions.  They say the high voltage is 2500 volts CW, 2000 volts phone.
>   Maximum PA plate current on cw is 290 mills and on phone, 260 mills.  They
> caution strongly against exceeding those values.
> 
> Don K4KYV
> 
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