[Central-Electronics] 600L Question

[George Maier]

Good suggestion, Jim!

I think mine had a piece of Bakelite sheet stock cut to size, and stuffed
into the same relay. Sort of a deluxe relay jammer (grin).   

73, George - W1LSB

-----Original Message-----
From: central-electronics-bounces at mailman.qth.net
[mailto:central-electronics-bounces at mailman.qth.net] On Behalf Of Jim
Candela
Sent: Saturday, October 08, 2011 12:21 PM
To: central-electronics at mailman.qth.net
Subject: Re: [Central-Electronics] 600L Question


George,

   I forgot about that 500 uf capacitor. Yep I replaced it also! I did 
not pull the selenium out though, as I recall it was a bugger to get at.

Another thing I forgot to mention was the overload circuit. That relay 
in mine was wedged with a Popsicle stick so it would not trip!! Removing 
the stick worked, but I had the occasional trip on a SSB voice peak. I 
dealt with it by placing a capacitor across the overload relay coil (+ 
side at ground). I did not take notes, so I do not recall what I put in 
there. As a guess, it was 1000 uf at 25v. The idea is to make the over 
current fault be more of a time averaged trip point as opposed to a peak 
current trip point. Maybe not ideal, but still better than the Popsicle 
stick defeat of the overload circuit. :-)

Jim
WD5JKO


On 10/8/2011 10:52 AM, George Maier wrote:
> Hi Donavan:
>
> Welcome to the group and to the circle of 600L owners also.  It's an
awesome
> piece of gear any way you look at it.
>
> When I first acquired my 600L I found a few potential problem areas that
> have not been mentioned so far, so here goes:
>
> The 500 uF - 50V electrolytic across the time delay relay in my unit was
on
> its last legs; high leakage and poor ESR.  Easy to find and replace.
>
> The 1N34 diode used to monitor reflected power was flaky, and would cause
> the load mis-match relay to chatter even when the load was fine.  One of
the
> engineers that used to work for CE told me that 1N34s were always a
> reliability problem, and should be replaced periodically. Well, I replaced
> them once anyway, and it's been fine ever since. They're readily available
> from Mouser. Same is true of the 1N34 balanced modulator diodes in all of
> the CE exciters, by the way.
>
> Like Jim, I was lucky enough to get a 600L with solid state rectifiers;
> highly recommended.  Those oil filled caps seem to last forever, BTW.
>
> Enjoy....hope to work you on the air sometime!
>
> 73, George - W1LSB
>
>
> -----Original Message-----
> From: central-electronics-bounces at mailman.qth.net
> [mailto:central-electronics-bounces at mailman.qth.net] On Behalf Of Donovan
W.
> Case
> Sent: Friday, October 07, 2011 8:05 PM
> To: central-electronics at mailman.qth.net
> Subject: [Central-Electronics] 600L Question
>
> Folks,
>
>
>
> I am new to the group, and a recent recipient of several nice CE units
> including three 20A's and a 10A.  I have a couple more coming including a
> 600L.  I am wonder what 600L owners have found to be the most troublesome
> parts in a 600L?  I keep looking at the 45uF / 1800V oil-filled cap
thinking
> that would be a tough one to find today, but perhaps there are other parts
I
> should be focusing on that are prone to failure in a 600L?
>
>
>
> Best Regards
>
> Donovan Case
>
> VE1BDC
>
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