[Amps] Ameritron AL-1500 Problem

[R.Measures]

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 at somis.org>
> To: "Fortra" <fortra at siol.net>
> Cc: "Jose E. Ribeiro Sa" <zemurtosa at mail.telepac.pt>; 
> <amps at contesting.com>; "Keith Dutson" <kdutson at 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 at mail.telepac.pt>
>>> To: "Keith Dutson" <kdutson at sbcglobal.net>; <amps at 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 at sbcglobal.net>
>>>> To: <amps at 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 at contesting.com 
>>>>> [mailto:amps-bounces at contesting.com] On
>>>>> Behalf Of Jose E. Ribeiro Sa
>>>>> Sent: Wednesday, October 05, 2005 8:19 AM
>>>>> To: amps at 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
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
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>>>>> Amps at contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>>
>>>>> _______________________________________________
>>>>> Amps mailing list
>>>>> Amps at contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>>
>>>>>
>>>>
>>>>
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>>>>
>>>
>>>
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>>>
>>>
>>
>> Richard L. Measures, AG6K, 805.386.3734.  www.somis.org
>>
>
>
>
>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org