The 1500B cooler is slightly different and more efficient at 1000W. Wind it
up tight and it looses steam fast.
Carl
KM1H
----- Original Message -----
From: <donroden@hiwaay.net>
To: <amps@contesting.com>
Sent: Thursday, June 21, 2012 5:36 AM
Subject: Re: [Amps] 4CX1500B's -- worth using?
> Quoting Ian White GM3SEK <gm3sek@ifwtech.co.uk>:
>> The *physical* power dissipation of the 1000A grid cannot be literally
>> zero. Eventually Eimac changed the data sheet to allow up to 5mA of grid
>> current to flow "for peak signal monitoring purposes"... but for some
>> reason the maximum rated power dissipation has always remained at
>> literally "zero"
>> 73 from Ian GM3SEK
>
> The ALC in the Collins 30S1 is derived from a transformer between the
> bias supply and the tube. To get ALC, Grid current must flow .....
> even if slightly.
> ZERO grid current = Zero ALC.
>
> Possibly a better ALC circuit is one that samples the rf as it comes
> into the amp and the user sets the ALC for zero grid current on a per
> band basis. Then the 4CX1000 could then operate in a "true" zero grid
> current mode.
>
> Don W4DNR
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 10.0.1424 / Virus Database: 2433/5082 - Release Date: 06/20/12
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|