[Amps] TUNER

Roger (K8RI) sub1 at rogerhalstead.com
Wed Oct 13 01:07:25 PDT 2010



On 10/13/2010 2:19 AM, Jim Thomson wrote:
> Date: Tue, 12 Oct 2010 18:04:53 -0400
> From: "Roger (K8RI)"<sub1 at rogerhalstead.com>
> Subject: Re: [Amps] TUNER
>
>
>    I wonder how one of these tuners, or input boards would work with a
> passive grid input on a Tetrode.
>
Possibly it's just my 756 Pro, but it goes nuts on all of my amps with 
untuned inputs "except' the old alpha 76.  Tetrodes, Pentodes, or 
Triodes; It doesn't discriminate. Turn the tuner off and the SWR is 
1.0:1. Turn it on and the meter looks like a windshield wiper going from 
end to end.

73

Roger (K8RI)
> 73
>
> Roger (K8RI)
>
> ##  what for ?   The xcvr 'see's  flat swr anyway.  You either have a 50 ohm passive grid R
> or a  200 ohm resistor.....and a 4:1  un-un.  On the big boy tubes [handles]  they use a 450 ohm
> resistor and a 9:1 un-un.    In all cases the xcvr is happy, and no tuner required.
>
> Jim   VE7RF
>
>
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