[Amps] QRO 2500DX MARK lll 4CX800

[John Bodine]

     Seems to be my turn to be picked apart but before you start you should
look at the tubes from DXE. On the older tubes, the metal ring under the
cooling find is indented. In the newer tubes from DXE. the metal ring under
the cooling find is expanded.
     Also, everyone knows there was never a 4CX800. Why don't we stipulate
that from this point forward?

On Thu, Apr 4, 2019, 1:32 PM Peter Voelpel <dj7ww at t-online.de> wrote:

> What new production run?
>
> DX Engineering says "Equivalent to 4CX800A", a 4CX800A never existed.
> And plate dissipation is 600W, not 800W.
>
> 73
> Peter
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of John Bodine
> Sent: Dienstag, 2. April 2019 13:04
> To: Amps Amps
> Cc: n2iccarl at gmail.com
> Subject: Re: [Amps] QRO 2500DX MARK lll 4CX800
>
> From personal experience, I would recommend DXengineering for the GU-74b.
> These are from a new production run by Svetlana and they work great but YOU
> MUST reset the bias when changing tubes or they may not run linear.
>
> https://www.dxengineering.com/parts/dxe-gu74b
>
> On Tue, Apr 2, 2019 at 1:32 AM Steve London <n2icarrl at gmail.com> wrote:
>
> > So, Carl, where would you suggest us cheap, constantly crying, hams get
> > new, or
> > at least new-old-stock Eimac 4CX800's and 3CX800's ? Lotsa luck.
> >
> > 73,
> > Steve, N2IC
> >
> > On 04/01/2019 09:08 AM, Carl wrote>>
> > >> Unlike Eimac, Philips and similar manufactures who design tubes for
> CCS
> > >> service along with plenty of reserve emission to compensate for aging.
> > that
> > >> tube and most amateur service Chinese are run at the edge.  And cheap
> > hams
> > >> cry constantly.
> > >>
> > >> Carl
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>
>
> --
>
> Later,
>         John Bodine/WU2E
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