The higher the frequency, the more the color changes from a red glow towards
white. (From 80/75m to 10m)
73,
Gary...wa6fgi
----- Original Message -----
From: "Scott Townley" <nx7u@arrl.net>
To: <w2cqm@juno.com>; <amps@contesting.com>
Sent: Sunday, July 09, 2006 8:44 PM
Subject: Re: [Amps] Question about glowing 3-400z's
>I would say that, considering the idle plate dissipation is 260W/tube, that
> some color would be expected.
>
>
> At 19:25 2006-07-09, w2cqm@juno.com wrote:
>>I'm working for the first time on a pair of 3-400Z's in a Swan Mark I. On
>>both the high and low power position, the amp is making exactly the
>>instruction manual's specified idle current. Plate voltage is 2900VDC and
>>idle current is 180ma. With key down and no excitation at this
>>level, the tubes begin to glow to a color that I consider to be a
>>bright red. The plate current meter shows no rise in current draw during
>>this entire process. The amplifier loads perfectly and when driven with
>>100w , power output is about 1100W. The question is whether this
>>"glowing" is the normal characteristic of a pair of Eimac tubes?? Any
>>comments will be appreciated. Ron W2CQM/3
>>
>>
>>
>>________________________________________________________________________
>>Try Juno Platinum for Free! Then, only $9.95/month!
>>Unlimited Internet Access with 1GB of Email Storage.
>>Visit http://www.juno.com/value to sign up today!
>>_______________________________________________
>>Amps mailing list
>>Amps@contesting.com
>>http://lists.contesting.com/mailman/listinfo/amps
>
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|