[Central-Electronics] 600L Question

[David Lee]

Ditto.  I had been previously frustrated with the overload trip, thinking it 
was some type of defective which existed in my amp and that I didn't 
understand.  I, too, found the the 600L tripping during SSB peaks at times. 
Seeing this as a common issue, makes me feel much better.  I will try the 
cap across the relay- sounds like a very practical compromise.  Thanks all 
for taking the time to share your experiences and battle scars.

73, Dave
W5OC

----- Original Message ----- 
From: "George Maier" <George at MaierGroup.com>
To: <central-electronics at mailman.qth.net>
Sent: Saturday, October 08, 2011 12:37 PM
Subject: Re: [Central-Electronics] 600L Question


> 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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