[R-390] Regulated filament voltage

[Henry Mei'l's]

Thanks David  - I clicked into DL's www and can see he wrote did exactly 
that kind of mod in 04.
He cleverly does this using a plug-in mock tube construction.
Henry, OZ3O N2NR

----- Original Message ----- 
From: "David C. Hallam" <dhallam at knology.net>
To: "Henry Mei'l's" <meils at get2net.dk>
Cc: <r-390 at mailman.qth.net>
Sent: Sunday, February 20, 2011 12:31 PM
Subject: Re: [R-390] Regulated filament voltage


> Please read Dallas Lankford's notes on R-390 filament voltage regulation.
>
> http://www.kongsfjord.no/dl/dl.htm
>
> David
> KW4DH
>
> On 2/20/2011 2:20 AM, Henry Mei'l's wrote:
>> Good morning (8:19 UTC), R-390A connoisseurs  and other good folk ;0)
>>
>> If you really want stabilized, constant filament voltage then why not
>> just a add a dc regulator circuit, set to 12.6V or thereabouts?
>>
>> This wouldn't take up much space and is entirely retro-able.
>>
>>
>> I know others have done this for other receivers using ballast
>> tube filament stabilization.
>>
>> Henry,
>> OZ3O  N2NR
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>
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>