[Swan] restoring a 250/117XC to life...

Ray, W4BYG w4byg at att.net
Sat Nov 30 13:12:18 EST 2013


I picked up a  fairly clean 250 and later a 117XC supply.  

The supply appears to have had capacitor replacements.  I brought it back to
life very slowly over 2 days time and it appears to be OK at 800 volts
output, at less than 1% ripple, no load yet.

The 250 has not been powered for a long time.  It may not have worked OK
when it was retired.

In the schematic I see a C202C, 40 Mfd cap on the +215 volt buss, plus a
number of bypass caps in other locations on power busses.  I see a C1601, 80
Mfd on the zener/VR circuit.  Also, a C202, 30 Mfd on the screen circuit o
the trans mixer.  There is a C409 on the -110v bias buss.  I will check each
of these before applying power.

My question:  Are there any other caveats to be concerned with in now
connecting the 250 to the supply?  Or, are there any other typically problem
components to be checked before the powering of the 250?   

It might be helpful if someone knows the approximate cold DC resistances of
the high, mid and bias voltage busses before I connect it up?  

Any recommendations based on prior experience would be appreciated.
73,

Ray, W4BYG
Cleveland, TN



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