[AMRadio] Grounded grid amp

Wed Jan 26 12:45:44 EST 2011

I think he was talking about a linear? if so four would only produce a 
carrier of around 30 watts.
----- Original Message ----- 
From: "John Coleman" <jc at pctechref.com>
To: "'Discussion of AM Radio in the Amateur Service'" 
<amradio at mailman.qth.net>
Sent: Wednesday, January 26, 2011 12:26 PM
Subject: Re: [AMRadio] Grounded grid amp


>I remember when I was a teen.  I had a pair of 813s in a final and the rig
> was some surplus thing made by FEDERAL.  It had no modulator. So I wire up 
> a
> pair of 1625s in the triode connection zero bias configuration as the RCA
> book said to do on 807s.  The original supply was only 450 volts to the
> final and the modulators.  I think the power out of the 813s was only 25
> watts.  But as time went by I got bigger supplies.  And went as high as 
> 1800
> volts on the 813s and the 1625s.  Those little bottles actually worked
> pretty well even at that high voltage but you had to limit the bass and
> never say fourrrrrrrrrr! Cause there would be lots of spitten and sparkin 
> in
> the glass!
> John
>
> -----Original Message-----
> From: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net] On Behalf Of David Folger
> Sent: Wednesday, January 26, 2011 11:03 AM
> To: Discussion of AM Radio in the Amateur Service
> Subject: Re: [AMRadio] Grounded grid amp
>
> Another option would be 2 to 4 6DQ5's. The 6DQ5 is cheap and easy to come
> by. Higher plate dissipation than a 6AG7.
>
> There are designs on the net. I would think you could get about 100W out 
> on
> AM with four of them as they have about 25W dissipation each.
>
> Other sweep tubes would work also, but most are more expensive.
>
> Just don't get carried away and believe the specs from some of the '70s 
> era
> sweep tube linears. They were overrated and burned tubes like crazy with
> crappy signals to boot.
>
> --- On Wed, 1/26/11, Hiroki Kato <hirokik at aol.com> wrote:
>
> From: Hiroki Kato <hirokik at aol.com>
> Subject: [AMRadio] Grounded grid amp
> To: "Discussion of AM Radio in the Amateur Service"
> <amradio at mailman.qth.net>
> Date: Wednesday, January 26, 2011, 7:54 AM
>
> Many years (decades) ago I saw a small amp using 5 x 6AG7 in parallel 
> using
> grounded grid. Very simple and elegant design. Perhaps it was in QST but I
> may be mistaken. Anyone has any info? I would like to build a 50-100 watts
> amp to boost an ARC 5.
>
> Hiroki AH6CY
>>
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