RG-58 also makes an excellent attenuator
Carl
KM1H
----- Original Message -----
From: "Glen Zook" <gzook@yahoo.com>
To: <Amps@contesting.com>; "Carl" <km1h@jeremy.mv.com>
Sent: Wednesday, February 11, 2009 3:16 PM
Subject: Re: [Amps] Dual tetrode in grounded grid
> Using an attenuator pad at the input is what I was considering. Of
> course I would rather use the power from the transmitting converter
> for something other than generating heat. Basically I was seeing if
> using the 5894 in grounded grid rather than grid driven was possible.
> I already have a pad on the input of the transmitting converter (to
> drop the output of my FT690RII from 8 watts to 2 watts) that I am
> using as the i.f. for the 222 MHz transmitting converter. I like to
> use 50 MHz instead of 28 MHz as the input for my higher frequency
> units if possible although I am using 28 MHz for my 432 MHz SSB.
>
> I normally do use link coupling above 50 MHz including in the 222 MHz
> transmitting converter which ends up with a 6360 mixer into a 6360
> final amplifier. I am presently getting a solid 5 watts out of the
> 6360 and if I tune it carefully I can get a little bit more.
>
> Glen, K9STH
>
> Website: http://k9sth.com
>
>
> --- On Wed, 2/11/09, Carl <km1h@jeremy.mv.com> wrote:
>
> Why not use a pad inside of the amp at the input link or tap?
>
> Looking at the tube specs Im not sure the 5894 screens are up to GG
> use. Its pretty close to a pair of 6146's in that respect. In AB grid
> driven it is a very linear tube.
>
> Link coupling will make it easy to tune out any reactance from carbon
> comp resistors. I do this with a partially HB 6M transverter with a
> 6360 driving a 4X150A which started out as a P&H 6-150 TX converter
> with a 5894.
>
>
>
>
>
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