[R-390] OT: Need advice regarding Blaupunkt tube radio

[Heinz Breuer DH2FA]

These tubular ceramics are high quality capacitors. The silver "plates" 
of the capacitor are on the inside and outside of the ceramic tube. 
There is no migration path possible.
Vy 73 Heinz DH2FA, KM5VT

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 > On 1/2/2011 3:26 PM, Barry wrote:
 >> Hi Ross,
 >>
 >> I did remove the cover from the first IF transformer, mainly because 
the lower ferrite core was difficult to turn.  Thinking it was made more 
like some of the transformers I've worked on (e.g. R39i0A), I thought I 
might be just twisting the insides; however, once I removed the can, it 
was apparent that wasn't the case.  These are made quire well and I 
wasn't twisting the windings after all.
 >>
 >> If I'm not mistaken, the caps are not the "sandwich" type like I've 
seen before, but they are very small diameter, quite long tubular caps 
that run vertically inside two of the corners.  I don't know if these 
are as prone to the silver disease as the sandwich styles.
 >>
 >> The B+ is indeed off and I assume I do need to replace the main 
filter caps.  There's slight hum on the output, but I don't hear it at 
low levels so the AC on the B+ isn't very bad.
 >>
 >> Hmmm, still not sure where to go from here.  There are some other 
electrolytics that I figure should be replaced; however, other than 
that, shotgunning the caps doesn't seem to be a need here.  This model 
used very high quality components, at least for the day.
 >>
 >> Thanks again,
 >>
 >> Barry - N4BUQ
 >>
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