[Boatanchors] OA2 operation

[Dave Sublette]

There were two responses.  Both said it seemed normal.  To elaborate, I am
running 270 volts into the back of the VF-1.  There is a 5K, 10 watt
dropping resistor to the OA2. The calculations said about 26 ma were
flowing.  I have turned on the VF-1 and it works.  From cold start it has
drifted down a couple of KHz on 7MHZ.  I think that is pretty good.  I
haven't touched the VF! except to brush the dust off just a bit.  I will
leave it running for the afternoon and see how it does.  I am very pleased
with the outcome.  BTW, I am running the filament with a regulated DC
voltage of 6.26 volts.  I didn't have a filament winding on the transformer
I am using for B+, so I installed a small 12 volt transformer supply and
added a regulator board.

Thanks for your help.

73,

Dave, K4TO

On Thu, May 5, 2022 at 1:33 PM KA2PTE <ka2pte at 3950.net> wrote:

> That sounds about normal. I believe its a 30mA max regulator.
>
> On a side note , I wonder if when you parallel these regulator tubes,
> does the current capacity double? Maybe someone out there knows.
>
> --
> Steve Hearns [ KA2PTE ]
>
>
> ----- Original Message -----
> From: "Dave Sublette" <k4to.dave at gmail.com>
> To: "Boatanchors at ThePorch" <boatanchors at lists.theporch.com>;
> <Boatanchors at mailman.qth.net>
> Sent: Thursday, May 05, 2022 12:53 PM
> Subject: [Boatanchors] OA2 operation
>
>
> > Greetings,
> >
> > I am building a power supply for a Heath VF-1 VFO.  I am finding the OA2
> > to
> > be running quite warm, not hot enough to burn fingers.  I am running it
> at
> > 20 ma current.  I am just wondering if this is normal.  It's been many
> > years since I have worked with tubes, so I thought I would ask here.
> >
> > Thanks for your help.
> >
> > 73,
> >
> > Dave, K4TO
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