Fw: [Amps] Conditioning Spare Tubes After Storage

[AA6DX]

And ... that 5CX1500A was (is) a TERRIBLE tube.  Thank goodness ECONCO was 
just down the road a piece when I was using one in a broadcast 
transmitter.  The track record for that EIMAC fiasco was not good!  I had 
on in a 5 band ham amp -- It was a famous Q-Street design -- but I did not 
have it on the air very much.  I bought the RF deck built, for I for sure 
would not have opted to build an amp using that particular valve!
73 --- Mark AA6DX
At 09:10 AM 10/14/2003, skipp isaham wrote:
>Hi Rich,
>-
>The specific tube that comes to mind was a 5cx1500a
>used in an Elcom Bauer "Sparta" FM Broadcast
>transmitter. We went to Econco rebuilds after the
>first few full pay new bottles.
>-
>cheers
>skipp
>
>On Mon, 13 Oct 2003 07:58:15 -0700 R.Measures <r at somis.org> writes:
> > Was the 10+ minute warmup time for a heater-type cathode or for a
> > thoriated-tungsten type cathode?
> >
> > >Hi Jeff,
> > >-
> > >I've received some broadcast transmitter tubes with
> > >recommended warm up times of 10 plus min, some
> > >as high as 30 minutes min.
> > >-
> > >A fellow broadcaster (now an SK) never paid
> > >much attention to the pre power warm up time
> > >especially the first install.
> > >-
> > >He called me over one night to source a
> > >breaker trip problem which was traced back
> > >to the tube, which was not allowed the
> > >recommended pre start filament idle time.
> > >-...
> >
> > -  R.L. Measures/Rich..., AG6K, 805.386.3734, www.somis.org