>
>> >Hi All,
>> >
>> >Before I will start to do fault diagnosis and try to find reson for
>it, it
>> >would be nice to have few comments from you, more experinced with
>amps and
>> >specially with AL-1500. The following indications has been made:
>> >
>> >1. Power dificult to find, it gives less than 1 Kw output. Driven
>> >Power has to be about 45 Watts. If it exceeds this level of driven
>power
>> >the Amp. trips down the protection. Usualy it was necessary to have
>about 90
>> >Watts to have about 1,5 Kw. Tunning was easy and not at all critical.
>> >
>> >2. Grid current is very low, either in CW or Phone, both almost dont
>move
>> >the
>> >nedle and after aplying Driven Power Plate current goes high sky to
>700Ma.
>> >and in some bands almos 1 A.
>> >
>
>Could be a problem of readings, sampling and related circuits, check
>for wattmeter accuracy too.
>With 0.7 or 1A of plate current the input power is over 3 KW, if HV is
>normal. If HV were abnormally low, grid current should be higher.
>If output is really low as 1 Kw, where do the 50% of the energy goes ?
>Nothing get burned or smells toasted ?
I hear reports of bandswitch failure due to heat fatigue. There is no
cooling air for the AL-1500 bandswitch.
cheers, Mauri
>
>
>
>
>--
>FAQ on WWW: http://www.contesting.com/FAQ/amps
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>
>
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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