On Oct 5, 2005, at 1:40 PM, Fortra wrote:
> Hi Rich,
>
> you might be right Richard! But since that time we still have the
> replaced tube. The visible difference between those two tubes was that
> the bad one has silver plated anode collar and the working one is
> nickel plated!
Ni is okay, Ag is better, but either will work and both have the same L.
> Taken that the cooling (air pressure ) is the same, could it be that
> one dissipate heat easier then the other one?
The plating is paper thin.
> Or, as somebody noted before, abuse by inexperienced operators??
Probably not. To find out what 's what, one needs a high-pot.
>
> Nermin S58DX
> ----- Original Message ----- From: "R. Measures" <r@somis.org>
> To: "Fortra" <fortra@siol.net>
> Cc: "Jose E. Ribeiro Sa" <zemurtosa@mail.telepac.pt>;
> <amps@contesting.com>; "Keith Dutson" <kdutson@sbcglobal.net>
> Sent: Wednesday, October 05, 2005 9:59 PM
> Subject: Re: [Amps] Ameritron AL-1500 Problem
>
>
>>
>> On Oct 5, 2005, at 9:01 AM, Fortra wrote:
>>
>>> Hi Jose,
>>>
>>> the problem you have described remind me about similar case waaay
>>> back in
>>> 80's. Our Alpha 77dx did the same thing on several occasions. It was
>>> find
>>> later after removal from the socket and replacement with new one,
>>> that the
>>> connection between the heater internally was void. If you shake the
>>> tube it
>>> will show the connection red on multimeter. Quite some years has
>>> elapsed
>>> since we learned that EIMAC did have some bad batch of tubes.
>>
>> The heat dam problem caused the 8877's heater to open?
>>
>>> Our amp was
>>> produced in 1980. Yeah, there are some weird stories how you can
>>> literally
>>> weld the heater connection back, using AC in series with bulb but I
>>> honestly
>>> do not recomended. Jose, swallow up and buy the GS35B. The rest it
>>> stayed,
>>> could be used to entertain your partner!!
>>>
>>> Best regards,
>>>
>>> nermin S58DX
>>> ----- Original Message -----
>>> From: "Jose E. Ribeiro Sa" <zemurtosa@mail.telepac.pt>
>>> To: "Keith Dutson" <kdutson@sbcglobal.net>; <amps@contesting.com>
>>> Sent: Wednesday, October 05, 2005 4:09 PM
>>> Subject: Re: [Amps] Ameritron AL-1500 Problem
>>>
>>>
>>>> Thank you Keith
>>>> Yes I just tested it with a second tranceiver and its the same.
>>>>
>>>>
>>>> 73 Jose CT1EEB
>>>>
>>>> ----- Original Message -----
>>>> From: "Keith Dutson" <kdutson@sbcglobal.net>
>>>> To: <amps@contesting.com>
>>>> Sent: Wednesday, October 05, 2005 1:31 PM
>>>> Subject: Re: [Amps] Ameritron AL-1500 Problem
>>>>
>>>>
>>>>> Sounds like a TR relay problem, such as sticking or intermittent
>>>>> ground.
>>>>> Have you checked the TR connection from the transceiver? Do you
>>>>> have a
>>>>> second transceiver? If so, does the problem continue with the
>>>>> other
>>>>> transceiver?
>>>>>
>>>>> 73, Keith NM5G
>>>>>
>>>>> -----Original Message-----
>>>>> From: amps-bounces@contesting.com
>>>>> [mailto:amps-bounces@contesting.com] On
>>>>> Behalf Of Jose E. Ribeiro Sa
>>>>> Sent: Wednesday, October 05, 2005 8:19 AM
>>>>> To: amps@contesting.com
>>>>> Subject: [Amps] Ameritron AL-1500 Problem
>>>>>
>>>>> Good afternoon
>>>>> Maybe some of you can give me a clue about this problem Iam
>>>>> experiencing
>>>>> with my Ameritron AL-1500 amp.
>>>>>
>>>>> A couple of days ago I switched on the AL-1500 and when I started
>>>>> TXing
>>>>> there was no output power at all (zero watt), the HV was OK (3300
>>>>> Volts),
>>>>> but no IP and power mesurements in the meter. Theres an ALC
>>>>> reading.
>>>>>
>>>>> I thought in could be some kind of bad contact in the 8877 lamp so
>>>>> I took
>>>>> it
>>>>> off cleaned the lamp socket metal contacts put in on again and the
>>>>> Linear
>>>>> amp. was working ok at full power. === so far so good ===
>>>>>
>>>>> Next day when I turned it on is WAS NOT TXing again, the problem
>>>>> was
>>>>> still
>>>>> there but after some tries the amplifier started transmitting at
>>>>> full
>>>>> power
>>>>> again and worked all day long.
>>>>>
>>>>> This morning again the same, but this time its not transmitting at
>>>>> all, I
>>>>> tried to to see if I could detect any malfunction but nothing, all
>>>>> seems
>>>>> OK,
>>>>> the amp. seems to be working ok, but no Power out no matter what I
>>>>> do.
>>>>> I also noticed that the impedance between the radio and the amp has
>>>>> changed
>>>>> because SWR in the radio is way too high (and before the match was
>>>>> perfect
>>>>> without SWR).
>>>>>
>>>>> I will apreciate your feedback and ideas about what might be
>>>>> originating
>>>>> this problem.
>>>>>
>>>>> 73 Jose CT1EEB
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Amps mailing list
>>>>> Amps@contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>>
>>>>> _______________________________________________
>>>>> Amps mailing list
>>>>> Amps@contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>>
>>>>>
>>>>
>>>>
>>>> _______________________________________________
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>>>>
>>>
>>>
>>> _______________________________________________
>>> Amps mailing list
>>> Amps@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>>
>>
>> Richard L. Measures, AG6K, 805.386.3734. www.somis.org
>>
>
>
>
>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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