Maurizio Panicara wrote:
>
> ----- Original Message -----
> From: "Alfredo Rosati I5UXJ" <alfredo@cln.it>
> To: <amps@contesting.com>
> Sent: Saturday, December 29, 2001 6:24 PM
> Subject: [AMPS] For who well know 8877
>
> > my result are :
> >
> > 3500 volt , 1Amp , 70 watt input , 2025 watt output ,120 ma grid.
>
> 3500V is not enough (proper) for 2KW.
> With 4KV and an optimized output circuit the IP should be around 0.8 A or
> even less.
>
> > i had tried also as data sheet of eimac told for 88-108 operation
> > at 2000 ,2500, 3000 , 4000 volt.
> >
> > the is the same more grid current than the data sheet.
> >
> > i had tried some different output circuit but little difference.
> >
> > the tube is capable with 100 watt input , to draw 1,5 amp. and an output
> > of 3700 watt (at 4000 volt).
>
> Impossible!
> Only with 2 tubes or using a wrong wattmeter and a wrong ammeter.
> ...or eventually a 3CX3000A7.
>
impossible but true.
measured with bird , controlled with spectrum analyzer , and on dummy
load bird.
the only specify little difference is 4200 volt on plate at full load.
at my not high efficiency , around 60% , there is 3780 watt, without the
input power.
for precisation i have 2 tubes , and the result was with little
difference , around 100 watt of difference in output with the same
input.
ciao alfredo i5uxj
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