I've been assembling this homebrew 1KW AM transmitter that
I inherited from W6MSC. (see www.yipyap.com , link
at bottom of the page...)
Right now I'm accumulating the tubes it needs. I've
already mentioned that, so I won't bore you with it.
My question for today is, how do I operate this thing once
I get it populated and apply power?
I have made a sketch of the PA circuit. You can find it
at:
http://www.yipyap.com/radio_stuff/W6MSC/PA_Circuit.pdf
I have marked three points where coils can be swapped out
for different sized units.
1) This is between the plates of the 250TH tubes. I have
three to choose from, all are similar size wire, wound on the
same size ceramic form. It fits into brackets under the
big B&W swinging link structure.
2) This is the main coil of the B&W structure. I have 4 or 5
to choose from , different size wire and different numbers of
turns.
3) This is the pickup on the swinging part of the swinging link.
I have 3-4 of these also ranging from a single turn to about 4
turns.
Ok, so my question is, how can I get this thing in a situation
nearly right, so when I apply power I don't blow something up!?!
I have a grid dip meter. Should I find a combination of 1,2&3
that dips at the selected frequency? What other procedures
do you suggest.
The second question is: when I get to running the thing,
what indications will I have that it is working right?
There are meters for plate current, grid current, filament
voltage, and plate voltage. I can twiddle the knobs... what
condition of operation am I looking for?
My biggest fear is that I'm going to apply power to this
and blow up the tubes or set something on fire.
Chris
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