[Boatanchors] OA2 operation

[hwhall at compuserve.com]

The old ARRL Handbooks show how to combine VR tubes for regulation & they include using tubes in parallel.

WayneWB4OGM

-----Original Message-----
From: JAMES D COMSTOCK <comnoz2 at comcast.net>
To: KA2PTE <ka2pte at 3950.net>; Boatanchors at mailman.qth.net
Sent: Thu, May 5, 2022 12:43 pm
Subject: Re: [Boatanchors] OA2 operation

I have not seen two 0A2's run in parallel.
 The striking voltage is going to be anywhere between 5 and 35 volts above the regulated voltage. One tube will always strike first and then the voltage will drop to the regulated voltage and the second 0A2 will never strike. Jim


> On 05/05/2022 11:33 AM 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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