They say 3600 in the manual and thats insanity even tho they clain the caps
are tested at 475.
OTOH Ive rejected several that start barking at 440V using my own tester. I
buy lots of caps from them for repair work and apparently Cornell Dublier
has been having QC problems the past 6 months as orders have been delayed
due to incoming testing (and full shipment rejections) now done at
Ameritron.
Guess I raised enough hell back when I first had problems.
Carl
----- Original Message -----
From: "Alek Petkovic" <vk6apk@bigpond.com>
To: "Carl" <km1h@jeremy.mv.com>
Cc: <amps@contesting.com>
Sent: Thursday, April 19, 2012 8:32 PM
Subject: Re: [Amps] More Capacitors vs LC filters
> "Aha! The old money in the bank from the mug punters trick." (Maxwell
> Smart)
>
> Guess I better get that heater voltage measured and set sooner rather than
> later.
>
> Hey, by the way, what is the plate voltage on the AL-1500 supposed to be
> if it ain't 3600V?
>
> Thanks and cheers, Alek.
> VK6APK
>
> On 20/04/2012 8:20 AM, Carl wrote:
>> As with many pulse tubes thats likely the same filament as an 8877 being
>> run hot in order to get the peak emission needed. Life will be shorter
>> and more money will be made.
>>
>> Carl
>> KM1H
>>
>>
>>
>>
>> ----- Original Message ----- From: "Alek Petkovic" <vk6apk@bigpond.com>
>> To: <amps@contesting.com>
>> Sent: Thursday, April 19, 2012 7:36 PM
>> Subject: Re: [Amps] More Capacitors vs LC filters
>>
>>
>> I think I'm the 3rd or 4th owner of the amp and I'm slowly "going
>> through it". I have some 500V/105°C capacitors on order to replace the
>> 450V ones. I think the existing ones are 220uF and the new ones will be
>> 330uF. Close enough.
>>
>> As I am aware that Ameritron amps are notorious for higher than spec
>> filament voltages, I have put a 3CPX1500 tube in the amp for the time
>> being. It believe it has the 5.5V heater and I figure I'll be safer with
>> that until I get around to measuring and adjusting the voltage at the
>> pins. I was going to address it when I swap out the filter caps. (So
>> many damn screws holding the lid down and the chassis straight!)
>>
>> According to the wiring and labelling, the transformer is running on the
>> 240V primary.
>>
>> AC line voltage here is pretty good. I just measured it at 239V. We are
>> supposed to have 240V. I've seen it drop to around 236V and rise to
>> around 243V. It is 7:30am on a cool autumn morning here in this small
>> seaside town. Heaters won't be in use but toasters and kettles will be.
>>
>> 73 and thanks,
>> Alek. VK6APK
>>
>>
>>
>> On 20/04/2012 6:29 AM, Carl wrote:
>>> What is the AC line and filament voltage at no load Alek.
>>>
>>> Ive also been told that a "number" of the 3 senior aps received
>>> incorrectly wound transformers that were not caught during test.
>>>
>>> Supposedly distributors have serial # info as well as the factory.
>>>
>>> Otherwise Id buck the input down 15V or so while making sure the
>>> filament is in spec using the internal connections or an external
>>> transformer.
>>>
>>> Carl
>>> KM1H
>>>
>>>
>>> ----- Original Message ----- From: "Alek Petkovic" <vk6apk@bigpond.com>
>>> To: <amps@contesting.com>
>>> Sent: Thursday, April 19, 2012 6:22 PM
>>> Subject: Re: [Amps] More Capacitors vs LC filters
>>>
>>>
>>>> Very interesting Jim.
>>>>
>>>> I get very nervous having my Ameritron AL-1500 sitting here less than 2
>>>> ft away from me, especially at start up time.
>>>>
>>>> It has 8 x 450V elecrolytics in series and the plate voltage meter
>>>> reads
>>>> exactly 3600V. They are running at 100%!
>>>>
>>>> 73, livin' on the edge, Alek. VK6APK
>>>>
>>>>
>>>> On 20/04/2012 3:51 AM, Jim Thomson wrote:
>>>>
>>>> (snip)
>>>>> I only operate these caps at 70-75% of the max V rating.
>>>> (snip)
>>>>>
>>>>>
>>>>> later... Jim VE7RF
>>>>>
>>>>> _______________________________________________
>>>>> Amps mailing list
>>>>> Amps@contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>>
>>>>
>>>>
>>>> --
>>>> From sunny Binningup, Western Australia.
>>>>
>>>> http://www.qrz.com/db/vk6apk
>>>> http://www.qrz.com/db/vk6ap
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> =======
>>>> Email scanned by PC Tools - No viruses or spyware found.
>>>> (Email Guard: 9.0.0.898, Virus/Spyware Database: 6.19600)
>>>> http://www.pctools.com/
>>>> =======
>>>> _______________________________________________
>>>> Amps mailing list
>>>> Amps@contesting.com
>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>
>>>>
>>>> -----
>>>> No virus found in this message.
>>>> Checked by AVG - www.avg.com
>>>> Version: 10.0.1424 / Virus Database: 2411/4946 - Release Date: 04/19/12
>>>>
>>>
>>>
>>
>>
>
>
> --
> From sunny Binningup, Western Australia.
>
> http://www.qrz.com/db/vk6apk
> http://www.qrz.com/db/vk6ap
>
>
>
>
>
> =======
> Email scanned by PC Tools - No viruses or spyware found.
> (Email Guard: 9.0.0.898, Virus/Spyware Database: 6.19600)
> http://www.pctools.com/
> =======
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 10.0.1424 / Virus Database: 2411/4946 - Release Date: 04/19/12
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|