[Boatanchors] replacing oil filled capacitor in Viking II ?

Fri Dec 18 20:37:23 EST 2020

When I overhalued my 1964 built V II CDC that cap (Sangamo here) got real 
warm after about 30 minutes. I replaced with a pair of 40 uF 450V 
electrolytics in series with 100K 3W resistors across each of them. I used 
what I had on hand for new caps and with the ckoke ahead of them all they 
did was remove some extra ripple.

Still fine after close to 20 years

Carl

----- Original Message ----- 
From: "brianpepperdine brianpepperdine" <brianpepperdine at sympatico.ca>
To: "boatanchors" <boatanchors at mailman.qth.net>
Sent: Sunday, December 13, 2020 4:26 PM
Subject: Re: [Boatanchors] replacing oil filled capacitor in Viking II ?

> Just to clarify, since it is apparent I need all the help I can get.. HI.
> Its a can (Sprague) oil filled capacitor and its  8 mfd / 1000 volts, not 
> 100
> volts (what at originally said in error). I believe that is the correct
> nomenclature.. " a can ".
> Cap sort of looks like corned beef/SPAM can, like a bath tub.
> Brian VE3VAW
>
>> ---------- Original Message ----------
>> From: Richard Knoppow <1oldlens1 at ix.netcom.com>
>> Date: December 13, 2020 at 3:52 PM
>>
>>
>>  If this is a 1KV cap its almost certainly a paper cap. I
>> don't think electrolytics were ever oil filled. The oil is
>> probably a PCB, I don't think a big hazard but try to keep from
>> being exposed to it much.
>>  I have no idea of what sort of HV caps are available now but
>> a search at one of the large suppliers should find out. Oil
>> filled paper caps came in round cans, like electrolytics, and the
>> familiar square cans. If you can replace it with a modern plastic
>> cap or a couple in series, they will last forever.
>>  While oil filled caps were much longer lasting than the usual
>> wax filled paper they still have a limited life and should be
>> replaced.
>>
>> On 12/13/2020 12:13 PM, howard holden wrote:
>> > Hello Brian,
>> >
>> > No experience with the Viking II, but I have a regulated 350VDC supply 
>> > that
>> > I use in a GO-9. That supply had an oil filled cap in the HV side which
>> > leaked. Replaced it with an equivalent value electrolytic, no issues 
>> > and
>> > it’s been playing for about 5 years now, very often and sometimes for 
>> > days
>> > at a time. I’d say go for it, just be careful with the oil filled in 
>> > case it
>> > is PCBs.  And no problem using the Viking II on CW – it’s my only mode!
>> >
>> > 73, Howie WB2AWQ Reno NV
>> >
>> > Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for 
>> > Windows
>> > 10
>> >
>> > From: brianpepperdine 
>> > brianpepperdine<mailto:brianpepperdine at sympatico.ca>
>> > Sent: Sunday, December 13, 2020 12:00 PM
>> > To: Boatanchor group<mailto:boatanchors at mailman.qth.net>
>> > Subject: [Boatanchors] replacing oil filled capacitor in Viking II ?
>> >
>> > Hi.
>> > I recently picked up a Johnson Viking II. Owner is SK.
>> > Looking inside it is pretty good top and bottom of chassis. No charred
>> > marking
>> > etc FWIW.
>> >
>> > The only thing of consequence at first view is the oil filled 
>> > capacitor.. 8
>> > Mfd
>> > 100 vdc. This does show a little of what I think is seepage around the 
>> > two
>> > terminals and bit around the seal of the can at the top. Not migrated
>> > anywhere
>> > else, not onto the chassis below nor down the can. Just a thin brown 
>> > line.
>> >
>> > Most of what I can see on the internet re. cap replacement in the 
>> > Viking II
>> > is
>> > re. the paper caps and electrolytics, which is straight-forward, but 
>> > they
>> > say
>> > the oil filled is generally OK and are left alone (no one seems to 
>> > mention
>> > possibility of PCB?). Anyhow, if the oil filled cap should go as a 
>> > caution
>> > re.
>> > what is seems visibly (I have not tested it re. capacitance nor 
>> > resistance)
>> >   what can I replace it with that is modern at 8 mfd and 1000 VDC? I 
>> > see no
>> > reference to that generally re. the Viking II nor electronics in 
>> > general?
>> > Any ideas how to proceed or advisability etc
>> > Hope to get this on the air by early 2021 if I can.. just need to order 
>> > the
>> > right stuff for it. Otherwise looks good and hope transformers etc. 
>> > fall
>> > into
>> > place A-OK of course etc. As do we all with our BAs coming in!! 
>> > Sacrilege of
>> > sacrileges I will only use it on CW, not AM phone...
>> >
>> > 73
>> > Brian VE3VAW
>> > ______________________________________________________________
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>> -- 
>> Richard Knoppow
>> 1oldlens1 at ix.netcom.com
>> WB6KBL
>>
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