[Amps] EIMAC Confusion

[mark]

Thank you all for the replies :)
I am  a Solid State kind'a guy. There, things are relatively simple. TOTAL
DEVICE DISSIPATION (TDD) is DCV times DCI`. The ratio between TDD and OUTPUT
POWER  (OP) defines the
efficency of the device. For example a 100W TDD transistor delivering 50W OP
is sayd to have
a 0.5 (or 50%) efficency.
Here, in the Tube world it gets a bit more complicated as I have to contend
with "parasitic" sources (like the filament and eventual grid source(s) )
and there is no explicit text that I found yet that will explain it's
(their) contribution to the TDD parameter.



Mark






----- Original Message -----
From: <i4jmy@iol.it>
To: "mark" <mark@sandlabs.com>
Cc: "amps" <amps@contesting.com>
Sent: Wednesday, November 13, 2002 4:52 AM
Subject: [Amps] Re: [Amps] EIMAC Confusion


> Mark,
>
> I think you did not understand how does it work.
> As the word says, the plate dissipation is the energy dissipated, not
> the total power involved.
> If a tube FM amplifier (typically a class b) has roughly 70% plate
> efficiency, @ 2600W out the plate dissipation is 1114W.
>
> 73,
> Mauri I4JMY
>
>
>
> ---------- Initial Header -----------
>
> >From    : amps-admin@contesting.com
> To      : <amps@contesting.com>
> Cc      :
> Date    : Tue, 12 Nov 2002 22:18:48 -0500
> Subject : [Amps] EIMAC Confusion
>
> > In the EIMAC Technical Data for the 8877/3cx1500A7
> > is is stated in the ABSOLUTE Ratings the Plate Dissipation
> > is 1500W. I take this as an ABSOLUTE MAX.
> >
> > However in the TYPICAL Operation at 88-108MHz USEFUL POWER OUTPUT
> > is rated at 2600W.
> >
> > Is this meaning that the tube is providing 2600W to the load while pla
> te
> > dissipation
> > is only 1500W? Is this possible ? If so What is then the TOTAL TUBE
> > DISSIPATION
> > and how is the filament power related to it ?
> >
> > Mark
> >
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>
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