[Boatanchors] Electrolytic Reforming Time

[Geoff]

The 6X4 and 6X5 and other indirect heated rectifiers are the ones that 
usually go first. Just ask anyone about Zeniths and 6X5's taking out 
transformers after they short.
The 80, 5Y3, 5Z3, 5U4, etc are often more forgiving of overcurrent and just 
let the xfmr go up in smoke...

There is nothing wrong with shelf queens if thats what you want and I have 
several that are either too scarce/valuable or are strictly there for the 
looks and not worth the effort to get working.

Others actually get used and are restuffed, etc and others are so common but 
excellent performers that they just get all modern caps and resistors where 
needed.

Carl
KM1H


Carl
KM1H




----- Original Message ----- 
From: "Al Klase" <al at ar88.net>
To: <WA5CAB at cs.com>
Cc: <boatanchors at mailman.qth.net>
Sent: Saturday, December 31, 2011 12:08 AM
Subject: Re: [Boatanchors] Electrolytic Reforming Time


> Robert,
>
> Not that I remember.  You're right, that could cause problems even with
> a new cap.  I was kinda hoping that the safety vents would keep one from
> actually bursting with that much force, but this is the kind of thing
> that happens with 50-60 year-old components.
>
> Al
>
>
> On 12/30/2011 11:17 PM, WA5CAB at cs.com wrote:
>> Al,
>>
>> Was the rectifier shorted after the explosion?
>>
>> In a message dated 12/30/2011 21:01:23 PM Central Standard Time,
>> al at ar88.net writes:
>>> I'm with Carl on this one.  I'd started to go easy on replacing
>>> electrolytics, as a lot of the post-war ones seemed to come around and
>>> function OK.
>>>
>>> THEN, a Sprague twist-prong that had been working happily for two weeks
>>> exploded.  There was a bunch of shredded material on the PS, but the can
>>> was not in evidence.  A little looking around found it across the great
>>> room, and a little more looking revealed a 3/4" deep dent 16 feet up on
>>> the cathedral ceiling,
>>>
>>> 'nuff said!
>>>
>>> Al
>>>
>>> On 12/30/2011 9:20 PM, Geoff wrote:
>>> >Just replace all electrolytics as dried out electrolytes will not
>>> magically
>>> >repair themselves.
>>> >Reforming is pure folly as a complete failure will happen but you cant
>>> >predict it.
>>> >
>>> >Carl
>>> >KM1H
>>
>>
>> Robert & Susan Downs - Houston
>> wa5cab dot com (Web Store)
>> MVPA 9480
>> ------------------------------------------------------------------------
>>
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>>
>
> -- 
> Al Klase - N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
>
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