[ARC5] BC-375 Re-Tube Project- Scratch Three

[Geoff]

What about an 811 or 812, A or non A?

Carl


----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: "David Stinson" <arc5 at ix.netcom.com>; "ARC-5 List" 
<arc5 at mailman.qth.net>
Sent: Monday, November 18, 2013 11:47 AM
Subject: Re: [ARC5] BC-375 Re-Tube Project- Scratch Three


> On 18 Nov 2013 at 3:10, David Stinson wrote:
>
>> Three candidate tubes for the
>> "Cheap Tubes for the BC-375" project have disappointed.
>> 1625, 837 and 7984 will not "hold up" in this service.
>> Once the screen voltages are dropped to spec,
>> the tubes lack the gain to oscillate reliably, even
>> with heavy "gimmick" cap coupling between grid
>> and plate in the OSC stage.
>
> David: Have you yet tried connecting the screen to the GRID (G1). As I 
> said
> earlier, this results in a HIGH-MU triode, which SHOULD work much better
> as an oscillator.
>
> Kenneth G. Gordon W7EKB
>
> "Courage is being scared to death but saddling up anyway."--- John   Wayne
>
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