[R-390] Black beauties and other old capacitors

[Al Parker]

Hi Pete, et al,
    I'm ready to order a qty of 0.01's, so took a look at Mouser for the
MKT1813 polyesters.  They do list them as a new product, but only have some
values in stock, no 0.01's, 0.022@250v, all the rest are 0.1 and above, a
few at 630v.  The price is slightly above their Orange Drop polypropylenes,
which they do have in 0.01@630vdc, in stock.  (400v is not very useful, I
think.)   Newark, whose online catalog is horrible to navigate, has even
fewer in stock.
    I guess I'll have to wait until next order, even tho' I agree with the
advantages you point out.
thanks for the tip,
73,
Al, W8UT
New Bern, NC
BoatAnchors appreciated here
http://www.thecompendium.net/radio/
http://www.hammarlund.info


----- Original Message -----
From: "G4GJL" <G4GJL@btopenworld.com>
> 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.
>
> These are available in the UK, Europe and yes...the USA!
>
> Their advantage, in my opinion, over the now famous Orange drops is that
> they are of axial construction (Cylindrical with the leads emerging from
the
> centre of the two ends.)
>  They are much easier to fit as replacements for the old axially
constructed
> BBODs, Vitamin Qs etc as the leads are in the right place with respect to
> the capacitor body...you dont need to cram them in as often they are
smaller
> than the capacitor you are replacing.
>
> Outer foil is clearly marked with a ring. The capacitor is made of Yellow
> polyester and is much more in keepink with the colours of the era of our
> R39/- series friends.
>
> ...And on the subject of DC leakage they pass the VTVM and HT PSU test in
> the same manner as the Orange drops...With flying colours!
>
> They perform well as coupling / decoupling capacitors at DC, AF, well into
> the RF spectrum. I would NOT use them as a resonating capacitor, though.
>
> Pete
> G4GJL