> >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 ?
How grid current can be so small with an high IP ?
Does grid changes varying coupling or increasing drive without changing
it ?
73,
Mauri I4JMY
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|