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echo: ham_tech
to: PAUL WILLIAMS
from: JEFF EDMONSON
date: 1997-12-12 23:13:00
subject: Hammarlund HQ-170C:RESTORATION

 > So far 160 - 15 seem to pick up signals, and it does
 > right nice on 80.
You oughtta get up early some morning (or stay up later ;->) and listen to 
some AM activity in the area, on 75m.  You might even hear me ;-)
 >  The thing is, is that the electrolytic caps need time
 > to reform.
If you've already had the thing on, and working, they've reformed.
 >  Proper procedure would be to reform them using a variac and
 > stepping up the voltage every so often, or to flat out
 > replace them.
Correct.
 >  Problem, no replacements on hand, and the variacs I
 > have are unaccessible. :<
Got one here... but again, if the reciever is already working, there's no 
need to worry about reforming the caps. If they had shorted during it's 
"rest", you'd know it by now!
 >  Is there by any chance an alternative method to reforming
 > old caps? Ie. maybe run it for 30 - 60min a day, and
 > leave it off the rest of the time.
Even that wouldn't have done it.
What you should have done was to bring it up, to around 25v on the primary 
line, and let it cook for a while.  After about an hour or two, bring it up 
another 25v, to around 50v, and let it play for a while.  Don't even attempt 
to listen to it - there's not enough tube emissions yet to allow it to work, 
yet.  After around another hour, bring it up to around 75v - another hour - 
100v (same waiting time), then up to normal line voltage.
73 = Best Regards            -Jeff KA5THB
ka5thb@bigfoot.com
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