Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Bollini, Maurizio wrote:
"Bollini, Maurizio" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Good morning again,
I have an AC-3 in these conditions: brand new, never powered up last 40
years.
What do you suggest to do before beginning the fireup procedure ?
Check to see that the installed fuse is the proper one for the line
voltage.
Do you suggest some components replacing? Which ones?
If you have a Variac or other variable AC voltage source, start by
applying 10-20% of full line voltage. Measure the DC outputs and if
they are 10-20% of the expected value, then bring the AC voltage up over
a minute or so. Then recheck output voltages.
If you have no variable AC source, you could just apply 12VAC from a
filament transformer to the input and see if the output voltages from
the AC-3 are about 10% of expected. If so, apply full line voltage and
recheck.
Alternatively, you could wire a light bulb in series with the AC line.
When you turn on the supply, if the bulb lights brightly for a second
and then dims, check the voltages and if they are good all is well. If
the bulb _stays_ bright, then the filter caps are probably shorted and
will need to be replaced.
Or again, convert using the AC-4R board and eliminate all problems!
More than likely, if you just plug it in and turn it on it will work
just fine!
--
73, Garey - K4OAH
Atlanta
Drake R-4C Service Information CD
http://hr99.home.mindspring.com/R-4C_Servicez
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