[Boatanchors] Reforming Electrolytic Capacitors

[w5jo at brightok.net]

What Gary says.  If you are sure the amp has been stored in a climate 
controlled location chances are you will not have trouble.

But you might want to check on availability of the series in there.  Many of 
the HV caps are getting scarce (read non-stocked).

Those in my Ameritron AL-1200 are 450 V. surge to 550 or so that uses screw 
attachment and I can't find them at any of the suppliers other than 
Ameritron direct.

Jim
W5JO

-----Original Message----- 


I never bother anymore. Make sure that the proper size fuse is in the amp
and turn it on. If it works, fine. If not replace all of the caps.

If they are dried out to where you have to reform them they most likely
won't last long. Better to replace them.

73
Gary  K4FMX

> -----Original Message-----
> From: Boatanchors [mailto:boatanchors-bounces at mailman.qth.net] On Behalf

>
> I can't really do that.  The interlocks ensure that I can't even turn
> the amp on unless the case is installed and bolted down.
>
> 73 de Mac, K2GKK/5 in OKC
> ________________________________
> From: Ron <ronami at yahoo.com>
> Sent: Monday, February 20, 2017 15:55
> To: D C _Mac_ Macdonald; boatanchors at mailman.qth.net; Drake Mailing List
> Subject: Re: [Boatanchors] Reforming Electrolytic Capacitors
>
>
> In principle, increase to the next step when the current into the cap is
> less
> then the rated leakage current. When the latter is not known, select a
> 'safe'
> value. Say, 1mA.
>
> -- Ron
>
>
> ________________________________
> From: D C _Mac_ Macdonald <k2gkk at hotmail.com>
> To: "boatanchors at mailman.qth.net" <boatanchors at mailman.qth.net>; Drake
> Mailing List <drake at mailman.qth.net>
> Sent: Monday, February 20, 2017 4:37 PM
> Subject: [Boatanchors] Reforming Electrolytic Capacitors
>
> The Drake L-75 Linear Amplifier I am trying to safely bring back to life
> left Drake's build line on May 14, 1981.
>
> It has NEVER had high voltage applied to the filter network.  The plate
> transformer was still in its sealed shipping carton so had never been
> installed.
>
>
> Who has any recommendations for "reforming" the filter caps?  I have it
> set up on a Powerstat (like Variac)
>
> and can bring the plate supply up gradually.  At first, I am applying 10
> to 120 VAC to the 240 VAC input to the power transformer.  I can rewire
> as appropriate to bring it to 240-250 VAC input.
>
>
> Using 10 Volt steps, what do you recommend for duration at each 10 Volt
> interval?
>
>
> 73 de Mac, K2GKK/5
>
> Oklahoma City, OK