HiJim & Carl，
Yes, Chinese 8877 is my option too.but in lower power level,for example
1000W,what is your option?
a GU-74?or a pair GI-7B(GI-46B)?or a pair 3-500Z?I know pulse tubes with
bad IMD specs.
73s Hsu
2014-12-29 7:26 GMT+08:00 rmorris <robrk@nidhog.net>:
> Though the "R" was for "linear service"... Maybe more better IMD. Have
> some.
>
> Sent from my iPhone
>
> > On Dec 28, 2014, at 16:59, Colin Lamb <k7fm@teleport.com> wrote:
> >
> > And, just to complicate things a bit, the 4CX250R is stated to provide
> more output than the 4CX250B. I think it is rated for repeater usage,
> although the bias and characteristics are different than the 4CX250B.
> >
> > 73, Colin K7FM
> >
> >
> >> On 12/28/2014 1:34 PM, Fuqua, Bill L wrote:
> >> I suspect when EIMAC came out with the 7034 they wanted to suggest
> that they were a good replacement for the
> >> 4X150A. Military particularly wanted to use the same part number when
> replacing tubes in their radios, and I suspect that
> >> EIMAC wanted to not only promote the 7034 they wanted to make one tube
> type rather than 2.
> >> There are subtle differences between the two tubes, besides plate
> dissipation limit. The characteristic curves for the 4X150A does not show
> any
> >> area where there is a negative flow of screen current, while this is an
> obvious issue some times with the 7034 and 4CX250B.
> >> This could be a problem in some cases when interchanging these tubes.
> There are other differences, one is that
> >> when operating the 7034 at 500MHz it does produce the same output power
> but requires 1/3 the drive power.
> >> 73
> >> Bill wa4lav
> >>
> >> ________________________________________
> >> From: Amps [amps-bounces@contesting.com] on behalf of Colin Lamb [
> k7fm@teleport.com]
> >> Sent: Sunday, December 28, 2014 8:15 AM
> >> To: Peter Voelpel; amps@contesting.com
> >> Subject: Re: [Amps] Power from Pair of Eimac 4 x 150 a / 7034?
> >>
> >> "The Eimac data sheet does not confirm that
> >>
> >> http://www.r-type.org/pdfs/4x150a.pdf
> >>
> >> The RCA 4X150A/7034 data does:
> >>
> >>
> http://pdf1.alldatasheet.com/datasheet-pdf/view/241849/ETC/7034-4X150A.html
> "
> >>
> >>
> >>
> >> The RCA data sheet refers to a 4X150A only, which is a different tube
> than the 4X150A/7034.
> >>
> >> 73, Colin K7FM
> >> _______________________________________________
> >> Amps mailing list
> >> Amps@contesting.com
> >> http://lists.contesting.com/mailman/listinfo/amps
> >
> > _______________________________________________
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