[R-390] 12BY7 in my R-390A

[David C. Hallam]

There are several methods of replacing the expensive and largely unnecessary
ballast tube in the R-390 and R-390A receivers.  Substituting a 12BY7 is one
of them.  Use it and don't worry about it.  It will work fine unless you
plan to use it in the field with an unregulated line voltage supply.

Review the "Pearls of Wisdom" in the archives for a discussion of the
several methods of replacing the ballast tube.

David
KC2JD/4

> -----Original Message-----
> From: r-390-bounces at mailman.qth.net
> [mailto:r-390-bounces at mailman.qth.net]On Behalf Of Rasputin Novgorod
> Sent: Wednesday, December 05, 2007 9:29 AM
> To: r-390 at mailman.qth.net
> Subject: [R-390] 12BY7 in my R-390A
>
>
> Hi All:
> I just discovered that I have a 12BY7 in my R-390A in the
> IF subchassis, RT510. Aparrently replacing the current regulator.
> Should I be concerned? Should I try to find the correct part?
> The radio works fine.
> Sincerely
> Blair
>
>
>
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