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

[Ian Wilson]

The 809 has a 6.3v filament (@2.5A). There is a 6L6 xtal osc / 809 final in
one of the RCA tube data books that I have always liked the looks of. Of
course, the 6L6 is not particularly gentle on modern crystals.

Another design I like is from the GE Ham News - 1614 VFO driving a
4-125A. Allegedly has good stability and break-in keying.

73, ian K3IMW



On Mon, Nov 18, 2013 at 6:49 PM, Mike Everette <radiocompass at yahoo.com>wrote:

> The 809 has a 7.5 volt filament if I remember right.
>
> What about the V-70-D, which was used as the final in the old Globe King
> 400?  I don't know how readily available they are today, but probably about
> the same as the T40 and TZ40.  I have a good pair of V-70-Ds left over from
> a GK400 that bit the dust years ago  (good riddance if you ask me -- that
> thing was a deathtrap).
>
> Or maybe the 572B?
>
> One potential problem with using any of these tubes might be that the
> plate connection has to be lengthened due to the plate cap.  The 211/VT-4-C
> has the plate connection at the bottom, of course.
>
> 73
>
> Mike
> W4DSE
>
>
>
>
>
> ________________________________
>  From: Geoff <geoffrey at jeremy.mv.com>
> To: kgordon2006 at frontier.com; David Stinson <arc5 at ix.netcom.com>; ARC-5
> List <arc5 at mailman.qth.net>
> Sent: Monday, November 18, 2013 4:13 PM
> Subject: Re: [ARC5] BC-375 Re-Tube Project- Scratch Three
>
>
> And then there is also the 809, T-40 and T-40Z, all of which are fairly
> available.
>
> Carl
>
>
> ----- Original Message -----
> From: "Geoff" <geoffrey at jeremy.mv.com>
> To: <kgordon2006 at frontier.com>; "David Stinson" <arc5 at ix.netcom.com>;
> "ARC-5
> List" <arc5 at mailman.qth.net>
> Sent: Monday, November 18, 2013 4:02 PM
> Subject: Re: [ARC5] BC-375 Re-Tube Project- Scratch Three
>
>
> > 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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