[R-390] Re: [R-390A] Electrolytic Can Filters C603 & C606

[Barry Hauser]

You can also buy new octal relay cases that start out empty -- if  you can't
find free ones or want to start up a volume operation.  I think it was Jan
Skirrow who was doing that and stuffing them with new electrolytics -- 
bought a couple of sets --- very nice.

Barry

----- Original Message ----- 
From: "Drew Papanek" <drewmaster813@hotmail.com>
To: <r-390@mailman.qth.net>
Sent: Monday, April 26, 2004 6:07 PM
Subject: [R-390] Re: [R-390A] Electrolytic Can Filters C603 & C606


>
> Bob Camp wrote:
>
> >What is commonly available are plug in cans with octal bases on them.
They
> >don't look like the original capacitors but most of them fit just fine in
> >the same location. Some of the cans are plastic and others are metal. I
> >prefer the metal ones, but that's because I dig them out of the trash at
> >work.
>
> Ahhhh!  Man after my own heart.   I'm reading this on a monitor acquired
> from "Curbside Computer" :)
>
> Gutted cases from square octal based relays work well also.  Of benefit is
> that there is no black
> uckumpucky to dig out as with the original caps.
>
> One could also dispense with any kind of octal plug.  The new caps could
> simply be installed under
> the audio deck chassis.   They could also be installed from above; use
> radial leaded caps and insert
> leads through the existing chassis sockets, solder leads to terminals
> underneath.
>
> >Opinion is mixed on just how large a capacitor to use if you do go
larger.
> >Bigger capacitors give less ripple, narrower current spikes and higher
> >voltages. Less ripple is good there is some debate about the higher
> >voltages.
>
> The stock value caps are probably on the large value side.  Perusal of the
> Cost Reduction Report
> reveals that larger values were used to compensate for the tendency of
> electrolytics to reduce capacitance at very low  temperatures.   Drag out
> the fat caps for when you stick the radio in your igloo.
>
> >Narrow current spikes are not a good idea. The caps that are located
after
> >a choke don't have any problems but the input capacitors do.
>
> All is copacetic in spikeland.  The R-390A B+ power supply is choke input.
> No worries there.
>
> >If you decide you need to pick up some more plug in capacitors what you
> >need to be pretty careful about is the can height.
>
> >You don't have to worry much about value or voltage since what ever is
> >inside is
> >probably long dead anyway.
>
> The 2 section cap could be a much shorter can.  For uckumpractice, the
first
> one I gutted was an octal
> can (not from an R-390A) about 2" tall.  I didn't use that can, but it had
> plenty of space to accommodate
> a pair of 47uF, 350v radial leaded caps.
>
> [On Fair Radio...]
> >Either way they are a likely source if you need to go mail order.
>
> How about that other place further out west?  They'll sell you a reformed
> (iffy proposition at best)
> NOS cap for "only" about $40.
>
> If one simply must attempt to use original or NOS electrolytics (with
their
> original insides), it would be well to remember that the General
Instrument
> units used in the '67 EAC contract are by far the worst.
>
> Drew
>
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