Terry.... I don`t think envelope coloring (or the lack of it!) is any
indicator of tube output capibility as far as the 4-1000 family of tube is
concerned.I have tested a lot of filthy looking bottles that were super high
output, as well as some very clean tubes that were duds! I do agree with
your power output specs though,I test my tubes pretty much as you do,and pay
special note to fil voltage at full power. These tubes have been around for
a long time now and still do a respectable job if the power supply being
used is ample for the job, and the operator uses a small amount of common
sense.A deck useing two tubes is easier to drive,and produces some rather
interesting results!
73 to all..Jim K7RDX
----- Original Message -----
From: Terry Gaiser <w6ru@bak.rr.com>
To: AMPS <amps@contesting.com>; wlfuqu00@uky.edu <Wlfuqu00@uky.edu>
Sent: Thursday, March 28, 2002 8:52 AM
Subject: Re: [Amps] What do you get out of your 4-1000
> My test of 4-1000A tubes ....
>
> 4000 volts under load.
> 100 watts drive power.
> 14.2 MHZ.
> Amplifier terminated into a Bird 2500 watt dummy load.
> Power output read with a Bird 43 wattmeter with 2500 watt HF slug.
> Sorry I do not pay any attention to Plate or Grid current. Amplifier is
> tuned for maximum output with CW transmission.
>
> With this setup I have seen BRAND NEW, unused tubes AND clean glass radar
> pulse pull out tubes produce between 1400 to 1600 watts output power.
Once
> in a great while I have seen a broadcast pull tube with dark glass show
this
> much power but that is rare ... they usually show 800 to 1200 watts
output.
>
> Terry W6RU
>
>
> ----- Original Message -----
> From: "wlfuqu00@uky.edu" <Wlfuqu00@uky.edu>
> To: " AMPS" <amps@contesting.com>
> Sent: Thursday, March 28, 2002 5:57 AM
> Subject: [Amps] What do you get out of your 4-1000
>
>
> > I had discussed buying some 4-1000A's from a fellow who has quite a
> > different opinion as to the maximum output per tube good tubes should
> produce.
> >
> > Here is his reply....
> >
> > "I have built several grounded-grid amplifiers with 5000 volts on the
> plate.
> > With 100 watts drive, don't recall ever getting more than about 1300
watts
> > output on 20 meters into a 50 ohm load."
> >
> > My experience for 6000 volts for a new tube has been well over 2KW
output.
> > Which is also supported by Bill Orr's publications however his tables
only
> > go to 5000volts.
> >
> > Can some of you indicate what your real life experience
> > using a 4-1000A. State if possible:
> > Plate Voltage (no drive)
> > Plate current (no drive)
> > Plate Voltage (max output)
> > Plate Current (Max output)
> > drive power
> > output power
> > And what you think the condition of the tube you are using is..
> >
> > 73
> > Bill wa4lav
> >
> > _______________________________________________
> > Amps mailing list
> > Amps@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
> >
>
>
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