[R-390] Black Beauty Replacements

[Drew Papanek]

Pete wrote:

>I would advocate the use of the Vishay Roederstein MKT1813 range of
>capacitors when replacing the likes of BBODs and others in the range 4700pF
>to 1uF at 400 or 630 v working.

<snipped>

Excellent choice, these are very good capacitors.  Another good choice is 
the Cornell-Dubilier (CDE) DME series, available inexpensively in a wide 
range of values from Mouser.  These caps are so small that despite their 
radial lead construction you can fit them in easily.  In the R-390A IF deck 
many of the BBOD's are installed on standoffs with a couple of inches total 
lead length to tube socket pin.  DME's can be installed right on the tube 
socket with much shorter lead length (possibly a benefit in bypass 
application).  A "relocation notice" can be written in the original BBOD 
location.  Yes, DME's also show virtually no leakage at rated voltage.   
Like the MKT1813's, DME's are not well suited to high current applications 
but are fine for bypass, coupling, timing and the like.

The Orange Drop is a fine capacitor with a proven reputation for reliability 
going back over 40 years.  They were originally manufactured by Sprague.  
Maybe Sprague came up with such a good product as attonement for their 
BBOD's.

Drew

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