[R-390] SS VR replacement for 3TF7

[Barry]

The only reason I might try it is lack of a ballast tube for one of my
R390A's.  It doesn't seem to be that much more difficult than a simple
resistor and if it gives better regulation, then why not give it a try.

One thing I don't understand about this is I thought solid-state voltage
regulators worked on either a positive or negative voltage, not AC.  Does
this arrangement still regulate both positive and negative half cycles?

Also, wasn't there an issue with solid-state noise?

Barry - N4BUQ (kicking more dead horses than you)

----- Original Message ----- 
From: "Tom Norris" <r390a at bellsouth.net>
To: <r-390 at mailman.qth.net>
Sent: Tuesday, January 03, 2006 1:41 PM
Subject: Re: [R-390] SS VR replacement for 3TF7


> Where's the Kielbasa? The Lutefisk? The Damp Sheep??
>
> But seriously...  I've heard this discussed in and among the Dead
> Horse Graveyard, and since I have a radio apart, now is as good a
> time as any to try it. Just need to pick up the parts in a few days.
> And I need to set up the GPS standard that I've been meaning to for
> the past two years that sits on the shelf pointing and laughing.
> I've got a serious roundtuit deficiency.
>
> Who else has tried the simple DC regulator method and written down
> what the results were versus that of a current regulator?  I'd hate
> to think a team of experienced engineers screwed up something as
> simple as a ballast arrangement.  Maybe if we stepped into our TARDIS
> and took them a boxful of 7812's we could have nipped the whole
> ballast problem in the bud, as Barney Fife would have said?
>
> 73
>
> Tom NU4G
> "Better Living Through Lutefisk"